RESEARCH SUPPORT

• NSERC
• Wisconsin Highway Research Program
• Nuclear Waste Management Organization (NWMO)
• GEOSLOPE INT.
• Department of National Defence

• • Doctor of Philosophy in Civil Engineering (Geotechnical)
    Department of Civil Engineering, University of Manitoba
  • Bachelor of Science in Civil Engineering
    Department of Civil Engineering, University of Manitoba 

JOURNAL

1. Abootalebi, P. and Siemens, G.A. 2018. Thermal properties of engineered barriers for a Canadian deep geological repository. Canadian Geotechnical Journal, 55(6): 759-776 [dx.doi.org/10.1139/cgj-2017-0150].
2. Siemens, G.A., Bathurst, R.J. and Miyata, Y. 2018. Numerical simulation and parametric analysis of
   multi-anchor walls using the finite element method. Transportation Geotechnics, 15: 57-69 [doi.org/10.1016/j.trgeo.2018.04.001].
3. Siddiqua, S., Tabiatnejad, B., and Siemens, G. 2018. Impact of pore fluid chemistry on the thermal conductivity of bentonite-sand mixture. Environmental Earth Sciences, 77:8 [https://doi.org/10.1007/s12665-017-7182-8].
4. Siemens, G.A. 2017. Thirty-ninth Canadian Geotechnical Colloquium: Unsaturated Soil Mechanics: Bridging the Gap Between Research and Practice. In press and available online. Canadian Geotechnical Journal, 55:7, 909-927 [doi.org/10.1139/cgj-2016-0709].
5. Sills, L-A.S., Mumford, K.G., and Siemens, G.A. 2017. Quantification of fluid saturations in transparent porous media. Vadose Zone Journal. 16(2), 2-9 [doi: 10.2136/vzj2016.06.0052].
6. Martin, E., Mumford, K., Kueper, B., and Siemens, G.A. 2017. Gas formation in sand and clay during electrical resistance heating. International Journal of Heat and Mass Transfer 110: 855-862
   [doi: 10.1016/j.ijheatmasstransfer.2017.03.056].
7. Lim, B.F. and Siemens, G.A. 2016. A unifying framework for modeling swelling soil behaviour. Canadian Geotechnical Journal 53(9): 1495-1509 [doi: 10.1139/cgj-2015-0049].
8. Tabiatnejad, B., Siddiqua, S. and Siemens, G.A. 2016. Impact of pore fluid salinity on the mechanical behavior of unsaturated bentonite-sand mixture. Environmental Earth Sciences, 75: 1434, 10 pp.
   [doi: 10.1007/s12665-016-6246-5].
9. Siemens, G.A., Mumford, K.G. and Kucharczuk, D. Characterization of variably transparent soil for heat transport experiments. ASTM Geotechnical Testing Journal - Special Issue on Transparent Soils. 38(5): 620-630 [doi: 10.1520/GTJ20140218].
10. Siemens, G.A., Take, W.A. and Peters, S.B. Physical and numerical modeling of infiltration including consideration of the pore air phase. Canadian Geotechnical Journal – Thematic Issue on Unsaturated Soils. 51: 1475–1487 [doi: 10.1139/cgj-2013-0447]. ‘Editor’s Choice’ Selection and Complementary Open Access.
11. Siddiqua, S., Siemens, G., Blatz, J.A., Man, A., and Lim, B.F. Influence of pore fluid chemistry on the mechanical properties of clay-based materials. Geotechnical and Geological Engineering. 32: 1029-1042 [doi: 10.1007/s10706-014-9778-z].
12. Lim, B.F. and Siemens, G.A.   An unconfined swelling test for clayey soils that incorporates digital image correlation. ASTM Geotechnical Testing Journal. 36(6): 823-833 [doi: 10.1520/GTJ20120220].
13. Siemens, G.A., Peters, S.B. and Take, W.A. 2013. Comparison of confined and unconfined infiltration in transparent porous media.  Water Resources Research. 49: 851-863 [doi: 10.1002/wrcr.20101].
14. Powell, J.S., Siemens, G.A., Take, W.A. and Remenda, V.H.   Characterizing the swell potential of Bearpaw Shale. Engineering Geology. 158: 89-97 [doi: 10.1016/j.enggeo.2013.03.006].
15. Rowe, R.K., Rayhani, M.T., Take, W.A., Siemens, G.A. and Brachman, R.W.I.   Physical modeling of GCL shrinkage under simulated field conditions. Geotextiles & Geomembranes 40: 12-19
    [doi: 10.1016/j.geotexmem.2013.07.008].
16. Powell, J.S., Siemens, G.A., Take, W.A. and Remenda, V.H. 2012. Influence of specimen geometry on sample disturbance observed in oedometric testing of clay shales. ASTM Geotechnical Testing Journal. 35(5): 771-783 [doi: 10.1520/GTJ104172].
17. Siemens, G., Take, W.A., Rowe, R.K.R. and Brachman, R.W.I.   Numerical investigation of transient hydration of unsaturated geosynthetic clay liners. Geosynthetics International, 19(3): 232-251 [doi: 10.1680/gein.12.00011].
18. Powell, J.S., Take, W.A., Siemens, G.A. and Remenda, V.H.   Time dependent behavior of the Bearpaw Shale in oedometric loading and unloading. Canadian Geotechnical Journal, 49(4): 427-441
    [doi: 10.1139/T2012-004].
19. Peters, S.B., Siemens, G., Take, W.A. 2011. Characterization of transparent soil for unsaturated applications. ASTM Geotechnical Testing Journal Special Issue on Innovations in Characterizing the Mechanical and Hydrological Properties of Unsaturated Soil, 34(5): 445-456. [doi:1520/GTJ103580].
20. Rayhani, M.T., Rowe, R.K., Brachman, R.W.I., Take, W.A. and Siemens. G.A. 2011. Factors affecting GCL hydration under isothermal conditions. Geotextiles & Geomembranes, 29(6): 525-533
    [doi: 10.1016/j.geotexmem.2011.06.001].
21. Rowe, R.K., Rayhani, M.T., Take, W.T., Siemens, G., and Brachman, R.W.I. 2011. GCL Hydration under Simulated Daily Thermal Cycles. Geosynthetics International, 18(4): 196-205
    [doi: 10.1680/gein.2011.18.4.196]. ‘Editor’s Choice’ Selection for GI.
22. Siddiqua, S., Blatz, J.A. and Siemens, G.A.   Evaluation of pore fluid chemistry on the hydro-mechanical behaviour of clay based sealing materials.  Canadian Geotechnical Journal, 48(2): 119-213 [doi: 10.1139/T10-064].
23. Siddiqua, S., Blatz, J.A. and Siemens, G.A.   Experimental study on the performance of light backfill and dense backfill.  Canadian Geotechnical Journal, 48(2): 214-225 [doi: 10.1139/T10-057].
24. Siemens, G.A. and Bathurst, R.J.   Numerical parametric investigation of infiltration in one-dimensional sand-geotextile columns.  Geotextiles and Geomembranes. 28: 460-476
    [doi:10.1016/j.geotexmem.20 09.12.0 09]. Honourable Mention for G&G Best Paper Award, 2010.
25. Siemens, G.A. and Blatz, J.A.   Evaluation of the influence of boundary confinement on the behaviour of unsaturated swelling clay soils.  Canadian Geotechnical Journal.  46(3): 339-356 [doi: 10.1139/T08-125].
26. Bathurst, R.J., Siemens, G.A. and Ho, A.F.   Experimental investigation of infiltration ponding in one-dimensional sand-geotextile columns.  Geosynthetics International, 16(3): 158-172
    [doi: 10.1680/gein.2009.16.3.158].
27. Siemens, G.A., Blatz, J.A., and Ruth, D.G.   A capillary tube model for transient two-phase flow through swelling soil.  Canadian Geotechnical Journal.  44(12):  1446-1461 [doi: 10.1139/T07-065].
28. Blatz, J.A., Anderson, D.E.S. and Siemens, G.A.   Evaluation of the transitional inelastic behaviour of unsaturated clay-sand mixtures.  Canadian Geotechnical Journal.  44(4):  436-446 [doi: 10.1139/t06-128].
29. Siemens, G.A. and Blatz, J.A.   Development of a hydraulic conductivity apparatus for bentonite soils.  Canadian Geotechnical Journal.  44(8):  997-1005 [doi: 10.1139/T07-025].
30. Siemens, G.A. and Blatz, J.A.   A triaxial apparatus for applying liquid infiltration with controlled boundary conditions and internal suction measurement.  Journal of Geotechnical and Geoenvironmental Engineering.  133(6): 748-752 [doi: 10.1061/(ASCE)1090-0241].
31. Bathurst, R.J., Ho, A.F., and Siemens, G.A.   A column apparatus for investigation of 1-D unsaturated-saturated response of sand-geotextile systems.  ASTM Geotechnical Testing Journal. 30(6): 433-441 [doi: 10.1520/GTJ100954].
32. Siemens, G.A. and Blatz, J.A. (2006) “The Influence of Boundary Conditions on the Hydraulic-Mechanical Behaviour of an Unsaturated Shrink / Swell Soil” ASCE Journal of Geotechnical and Geoenvironmental Engineering. In Preparation.
33. Siemens, G.A., Blatz, J.A., and Ruth, D.G. (2006) “A Capillary Tube Model for Transient Two-Phase Flow Through Swelling Soil” Canadian Geotechnical Journal. Submitted.
34. Siemens, G.A. and Blatz, J.A. (2006) “A hydraulic conductivity apparatus for deformable materials” Canadian Geotechnical Journal. Submitted.
35. Siemens, G.A. and Blatz, J.A. (2006) “A triaxial apparatus for applying liquid infiltration with controlled boundary conditions and internal suction measurement” ASCE Journal of Geotechnical and Geoenvironmental Engineering. Submitted.
36. Blatz, J.A., Anderson, D.E.S. and Siemens, G.A. (2006) “Evaluation of the transitional inelastic behaviour of unsaturated clay-sand mixtures” Canadian Geotechnical Journal. Accepted Tentatively.

CONFERENCE PAPERS

1. Laporte, S., Siemens, G.A. and Beddoe, R.A. 2018. Physical modelling of roads in expansive clay subjected to wetting-drying cycles. 9^th International Conference in Physical Modelling in Geotechnics, London, UK. 175-178.
2. Siemens, G.A. and Beddoe, R.B. 2017. Spatial Resolution of Degree of Saturation Measurements in Unsaturated Transparent Soil Experiments. Invited paper for Second Pan-American Conference on Unsaturated Soils, Dallas, TX, 12-15 November 2017, 174-184.
3. Fourier, V.P.C., Siemens, G.A., Beddoe, R.A., Lim, B.F., Weber, K., Reed, S., Loock, D. 2017. Historical ground temperatures from the Canadian Arctic. GeoOttawa, 60^th Canadian Geotechnical Conference.
4. Laporte, S. and Siemens, G.A. 2017. Physical modelling of undrained slope failure using a geotechnical centrifuge. GeoOttawa, 60^th Canadian Geotechnical Conference.
5. Fourier, V.P.C., Siemens, G.A., Beddoe, R.A., Lim, B.F., Weber, K. 2017. Two decades of ground temperatures from across the Canadian Arctic. 2^nd Asian Conference on Permafrost (ACOP2017). 2-6 July 2017, Sapporo, Japan.
6. Kingswood, J., Laporte, S. and Siemens, G.A. 2016. Validation of the RMC geotechnical centrifuge. GeoVancouver, 59^th Canadian Geotechnical Conference, 2-5 October 2016.
7. Tabiatnejad, B., Siddiqua, S. and Siemens, G. 2016. Impact of pore fluid chemistry on the thermal conductivity of the clay-based materials. GeoVancouver, 59^th Canadian Geotechnical Conference, 2-5 October 2016.
8. Dixon, D.A., Man, A., Stone, J., Rimal, S., Siemens, G., Abootalebi, P. and Birch, K. 2016. Backfilling and sealing materials for a deep geological repository. 3rd Canadian Conference on Nuclear Waste Management, Decommissioning and Environmental Restoration, Ottawa, ON, Canada, September 11-14, 2016.
9. Abootalebi, P. and Siemens, G.A. 2016. Thermal-hydraulic modelling a Canadian deep geological repository. 1^st Conference on Energy Geotechnics, Kiel, Germany, August 2016, 265-270.
10. Siemens, G.A., Beddoe, R.W., Gholami, M., Khoshand, A., Fraser, S., Paquin, V., Weber, K.P., Stewart, H., and Argument, D. 2016. Landslide risk assessment of a tailings pile at an abandoned mine considering potential of seismicity, tsunami waves, liquefaction and rainfall to cause large-scale erosion. 2016 RPIC Federal Contaminated Sites National Workshop. 25-27 April 2016.
11. Styba, M., Take, W.A., Siemens, G.A. and Mumford, K.G. Physical modelling of condensation-driven downslope erosion of GCLs. GeoAmericas 2016, 3^rd Pan-American Conference on Geosynthetics, Miami, USA, 10-13 April 2016.
12. Siemens, G.A., Beddoe, R., and Take, W.A. 2015. Numerical simulations of a landslide triggering experiment. XV Pan-American Conference on Soil Mechanics and Geotechnical Engineering, Argentina, Buenos Aires, 15-18 Nov 2015, 2244-2251.
13. Lim, B.F. and Siemens, G.A. 2015. Shear strength of a swelled soil examining influence of swelling boundary conditions. Unsaturated Soils: Research & Applications, GuiLin, China, 23-26 Oct 2015.
14. Abootalebi, P. and Siemens, G.A. Thermal property testing of an engineered barrier for use in a deep geological repository. GeoQuebec 2015 - 68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference, Quebec City, QC, 20-23 September 2015.
15. Siemens, G.A., Mumford, K.G., and Sills, L.-A. Investigation of gas migration and retention using transparent soil. International Symposium on Energy Geotechnics Universitat Politècnica de Catalunya (UPC) Barcelona, Spain. 2-4 June 2015.
16. Sills, L.-A., Siemens, G.A., and Mumford, K.G. 2014. Laboratory investigation of gas bubble flow through layered heterogeneities using transparent soil. 2014 Geological Science of America Meeting in Vancouver, BC, 19-22 October 2014.
17. Kucharczuk, D. Mumford, K.G. and Siemens, G. 2014. Optimization of transparent soil to investigate heat transport in porous media. 67^th Canadian Geotechnical Conference, GeoRegina 2014, 28 Sept – 1 Oct 2014.
18. Dean, C., Siddiqua, S. and Siemens, G.A. 2014. Characterization of oil sands tailings containing a high hydrocarbon content and a synthetic polymer. 67^th Canadian Geotechnical Conference, GeoRegina 2014, 28 Sept – 1 Oct 2014. 
19. Siemens, G.A. and Oldroyd, C.P. Comparison of 1D and 2D infiltration results using unsaturated transparent soil, UNSAT 2014, Unsaturated Soils: Research & Applications Sydney Australia 2-4 July 2014 Vol. 2, 1085-1090.
20. Take, W.A., Wolinsky, E. and Siemens, G.A. 2013. Development of a centrifuge tilt-table device to investigate instability phenomenon under simulated infinite slope condition. 66^th Canadian Geotechnical Conference, GeoMontreal 2013, 29 September – 3 October 2013. 
21. Siemens, G., Take, W.A., Rowe, R.K.R. and Brachman, R.W.I.   Parametric study of transient hydration of unsaturated geosynthetic clay liners. Proceedings of the 18^th International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013, 1187-1190.
22. Siemens, G.A., Take, W.A. and Peters, S.B. Examination of unsaturated conductivity curves using transparent soil. Unsaturated Soils: Research and Applications, Eds. C. Mancuso, C. Jommi and F. D’Onza,
    Vol. 1, 213-218.
23. Sills, L.-A., Siemens, G., and Mumford, K. Use of transparent soil to investigate discontinuous gas flow in heterogeneous porous media. 65^th Canadian Geotechnical Conference, Winnipeg, MB, 30 Sept – 3 Oct 2012.
24. Take, W.A., Siemens, G., and Potvin, J. Comparison of desiccation cracking patterns between air and oven-dried GCL specimens. 5^th European Geosynthetics Congress, Valencia, Spain, 16-19 Sept 2012, 71-76.
25. Siemens, G., Take, W.A., Peters, S.B. and Oldroyd, C.P.   Investigation of multi-phase flow phenomena using transparent soil. Presented at Geological Science of America Meeting & Exposition, 9-12 October 2011, Minneapolis, MN.
26. Potvin, J., Take, W.A., Siemens, G.A. and Kerr, A., 2011. X-Ray imaging of desiccation cracking patterns in geosynthetic clay liners. Proceedings of the 14^th Pan-Am Conf on Soil Mech and Geot Eng and 64^th Canadian Geotechnical Conference, Toronto, ON, 3-5 October 2011.
27. Siddiqua, S., Blatz, J.A., and Siemens, G.A., 2011. Investigation of the mechanical behaviour of light and dense backfill material subjected to various pore fluid conditions.  Proceedings of the 14^th Pan-Am Conf on Soil Mech and Geot Eng and 64^th Canadian Geotechnical Conference, Toronto, ON, 3-5 October 2011.
28. Bailey, B., Hutchinson, D.J., Gordon, D., Siemens, G.A., Ruel, M. Field and laboratory procedures for investigating the fouling process within railway track ballast.  Proceedings of the 14^th Pan-Am Conf on Soil Mech and Geot Eng and 64^th Canadian Geotechnical Conference, Toronto, ON, 3-5 October 2011.
29. Bailey, B., Hutchinson, D.J., Siemens, G.A., Ruel, M. Assessment of embankment fouling from geotechnical testing of railway ballast samples.  Proceedings of the 14^th Pan-Am Conf on Soil Mech and Geot Eng and 64^th Canadian Geotechnical Conference, Toronto, ON, 3-5 October 2011.
30. Powell, J.S., Siemens, G. and Take, W.A.   Apparatus compliance in oedometer testing at high pressures.  Proceedings of the 63^rd Canadian Geotechnical Conference, Calgary, AB.
31. Siemens, G.A., Peters, S.B. and Take, W.A. Analysis of a drawdown test displaying the use of transparent soil in unsaturated flow applications.  Proceedings of the 5^th International Conference on Unsaturated Soils, Barcelona, Spain, 6-8 September 2010, 733-738.
32. Siemens, G.A. and Bathurst, R.J. 2010. Physical and numerical modeling of infiltration in sand-geotextile systems. Proceedings of the 9th International Conference on Geosynthetics, Brazil, 23-27 May 2010, Vol. 3, 1251-1254. 
33. Peters, S.B., Siemens, G.A. and Take, W.A.   A transparent medium to provide visual interpretation of saturated/unsaturated hydraulic behaviour.  62^nd Canadian Geotechnical Conference, Halifax, NS, 21-23 September 2009, 59-66.
34. Siemens, G.A. and Bathurst, R.J.   Physical and numerical modeling of 1-D infiltration in sand-geotextile layers.  62^nd Canadian Geotechnical Conference, Halifax, NS, 21-23 September 2009, 843-850.  
35. Bathurst, R.J. and Siemens, G.A. 1-D saturated-unsaturated behaviour of sand-geotextile columns.  7th International Conference on Soil Mechanics and Geotechnical Engineering (17^th ICSMGE), 5-9 October 2009, Alexandria, Egypt, 3437-3440. 
36. Rayhani, M.H.T., Rowe, R.K., Brachman, R.W.I., Take, W.A. and Siemens, G.   Prototype modeling of GCL hydration and shrinkage under simulated field conditions. Geosynthetics 2009, Salt Lake City, UT, 25-27 February 2009, 1-9.
37. Rayhani, M.H.T., Rowe, R.K., Brachman, R.W.I., Siemens, G. and Take, W.A.   Closed-system investigation of GCL hydration from subsoil.  61^st Canadian Geotechnical Conference, Edmonton, AB, 22-24 September 2008, 324-328.
38. Lim, B.F., Siemens, G.A., Boyle (Powell), J.S., Remenda, V., and Take, W.A.   Numerical analysis of expansive soil behaviour using the Swell Equilibrium Limit.  61^st Canadian Geotechnical Conference, Edmonton, AB, 22-24 September 2008, 176-181.
39. Siemens, G.A. and Blatz, J.A.   Numerical modelling of shallow foundations on swelling clay soil using the swelling equilibrium limit.  1^st European Conference on Unsaturated Soils (E-UNSAT), Durham, United Kingdom, 2-5 July 2008, 855-860.
40. Siemens, G.A.   Replacement of a 30 year old shallow foundation on swelling soil:  a case study.  2^nd Canadian Young Geotechnical Engineers and Geoscientists Conference (cYGEGC), Ganonoque, Ontario, 25-27 October 2007, CD Proceedings.
41. Siemens, G.A. and Blatz, J.A. 2006. Examination of swelling soil structure following liquid infiltration under controlled boundary conditions.  59^th Canadian Geotechnical Conference, Vancouver, BC.  1-4 October 2006, 1150-1155.
42. Siemens, G.A., Blatz, J.A. and Priyanto, D.G. 2006. Results of long-term infiltration tests on an unsaturated swelling clay.  Geotechnical Special Publication No. 147:  Proceedings of the Fourth International Conference on Unsaturated Soils, Carefree, Arizona, 2-6 April 2006, 939-950.
43. Priyanto, D.G., Blatz J.A. and Siemens, G.A.   Evaluation of two constitutive models to simulate behavior during constant volume infiltration on a swelling clay soil.  Geotechnical Special Publication No. 147:  Proceedings of the 4^th Int Conference on Unsaturated Soils, Carefree, Arizona, 2-6 Apr 2006,1: 985-996.
44. Priyanto, D.G., Blatz, J.A. and Siemens, G.A.   Comparison of two constitutive models to simulate the behaviour of unsaturated swelling clay. 58^th Canadian Geotechnical Conference, Saskatoon, Saskatchewan. 
    19-21 Sept 2005.
45. Siemens, G.A. and Blatz, J.A.   Soil suction measurement using the Xeritron Sensor in two different types of infiltration tests on a swelling soil.  International Symposium Advanced Experimental Unsaturated Soil Mechanics, Trento, Italy.  27-29 June 2005, 23-26.
46. Siemens, G.A.   Importance of stress path control in soils testing.  1^st Canadian Young Geotechnical Engineers and Geoscientists Conference (cYGEGC), Quebec City, Quebec.  27-30 October 2004.
47. Siemens, G.A., Blatz, J.A., Kjartanson, B. and Priyanto, D.G.   Numerical modeling of a container emplacement concept in a deep geological environment.  57^th Canadian Geotechnical Conference, Quebec, Quebec.  24-26 October 2004, Session 6F, 1-8.
48. Priyanto, D.G., Siemens, G.A., Blatz, J.A. and Graham, J.   The Parameter Evaluation Method (PEM) of elastic-plastic model properties for unsaturated high-plastic clay.  57^th Canadian Geotechnical Conference, Quebec, Quebec.  24-26 October 2004, Session 6E, 9-16.
49. Blatz, J.A., Anderson D.E.S., Graham J. and Siemens G.A.   Evaluation of yielding in unsaturated clays using an automated triaxial apparatus with controlled suction.  Invited Lecture Paper International Conference From Experimental Methods Towards Numerical Modeling of Unsaturated Soils, Bauhaus-Universität, Weimar, Germany, September 2003.  285-300.
50. Siemens, G.A., Ferreira, N.J., Blatz, J.A. and Graham, J.   Digital imaging and the internet: using current technologies to connect the field to the office. 2^nd Canadian Specialty Conference on Computers in Geotechnique.  Winnipeg, Manitoba.  134-141.
51. Siemens, G.A. and Blatz, J.A. (2006) “Examination of swelling soil structure following liquid infiltration under controlled boundary conditions” 59th Canadian Geotechnical Conference, Vancouver, BC. 1-4 October 2006.
52. Siemens, G.A., Blatz, J.A. and Priyanto, D.G. (2006) “Results of long-term infiltration tests on an unsaturated swelling clay” Geotechnical Special Publication No. 147: Proceedings of the Fourth International Conference on Unsaturated Soils, Carefree, Arizona, 2-6 April 2006, 1:939-950.
53. Priyanto, D.G., Blatz J.A. and Siemens, G.A. (2006) “Evaluation of Two Constitutive Models to Simulate Behavior during Constant Volume Infiltration on a Swelling Clay Soil” Geotechnical Special Publication No. 147: Proceedings of the Fourth International Conference on Unsaturated Soils, Carefree, Arizona, 2-6 April 2006, 1: 985-996.
54. Priyanto, D.G., Blatz, J.A. and Siemens, G.A. (2005) “Comparison of Two Constitutive Models to Simulate the Behaviour of Unsaturated Swelling Clay” 58th Canadian Geotechnical Conference, Saskatoon, Saskatchewan. 19-21 September 2005.
55. Siemens, G.A. and Blatz, J.A. (2005) “Soil suction measurement using the Xeritron Sensor in two different types of infiltration tests on a swelling soil” International Symposium Advanced Experimental Unsaturated Soil Mechanics, Trento, Italy. 27-29 June 2005, 23-26.
56. Siemens, G.A. (2004) “Importance of stress path control in soils testing” 1st Canadian Young Geotechnical Engineers and Geoscientists Conference (cYGEGC), Quebec City, Quebec. 27-30 October 2004.
57. Siemens, G.A., Blatz, J.A., Kjartanson, B. and Priyanto, D.G. (2004) “Numerical modeling of a container emplacement concept in a deep geological environment” 57th Canadian Geotechnical Conference, Quebec, Quebec. 24-26 October 2004, Session 6F, 1-8.
58. Priyanto, D.G., Siemens, G.A., Blatz, J.A. and Graham, J. (2004) “The Parameter Evaluation Method (PEM) of Elastic-Plastic Model Properties for Unsaturated High-Plastic Clay” 57th Canadian Geotechnical Conference, Quebec, Quebec. 24-26 October 2004, Session 6E, 9-16.
59. Siemens, G.A., Ferreira, N.J., Blatz, J.A. and Graham, J. (2002) “Digital imaging and the internet: using current technologies to connect the field to the office” 2nd Canadian Specialty Conference on Computers in Geotechnique. Winnipeg, Manitoba. 134-141.

• Professional Engineers Ontario (#100186569)
• Canadian Geotechnical Society
• North American Geosynthetics Society
• Canadian Society of Civil Engineers
• American Society of Civil Engineers
• International Geosynthetics Society