Abstract
Loess is a typical structural unsaturated soil. Because the matric suction of unsaturated loess changes with water migration, the properties of unsaturated soil clearly change. Therefore, the matric suction is considered the main factor affecting the properties of unsaturated loess. Generally, soils are subjected to three principal stresses in practical engineering. To investigate the properties of unsaturated natural loess under complex stress states, a suction-controlled true triaxial apparatus with a rigid-flexible boundary was applied to test unsaturated loess under true triaxial loading. Four sets of suction-controlled tests, including isotropic consolidation followed by monotonic shearing, were carried out, and the matric suction was controlled in the true triaxial tests. The compression yield characteristics of loess were investigated under different matric suctions. The influence of the matric suction and intermediate principal stress parameter were analysed based on the test results. Consolidated drained tests of loess with constant matric suctions were performed under a constant net mean stress and deviatoric stress with different intermediate principal stress parameters. Stress-strain curves and failure envelopes of loess were also presented. The stress-strain-strength properties of unsaturated loess are related to the matric suction and intermediate principal stress parameter under true triaxial stress conditions. The earth pressure of the Q3 loess stratum of the loess foundation pit was analysed based on a strength criterion of unsaturated loess with matric suction.
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References
Airey DW, Wood DM (1988) The cambridge true triaxial apparatus. In: Donaghe R, Chaney R, Silver M (eds) Advanced Triaxial Testing of Soil and Rock. ASTM International, West Conshohocken, pp 796–805. https://doi.org/10.1520/STP29115S
Barden L, Mcgown A, Collins K (1973). The collapse mechanism in partly saturated soil [J]. Eng Geol 7(1):49–60
Chen CL, Zhang DF, Dong YZ et al (2014) Suction and mechanical behaviours of unsaturated intact loess from constant water content triaxial tests. Chin J Geotech Eng 36(7):1195–1202. (in Chinese). https://doi.org/10.11779/CJGE201407002
Choi C, Arduino P, Harney MD (2008) Development of a true triaxial apparatus for sands and gravels. Geotech Test J 31(1):32–44. https://doi.org/10.1520/GTJ100217
Cunningham MR, Ridley AM, Dineen K et al (2003) The mechanical behaviour of a reconstituted unsaturated silty clay. Géotechnique 53:183–194. https://doi.org/10.1680/geot.2003.53.2.183
Derbyshire E (2001) Geological hazards in loess terrain, with particular reference to the loess areas of China. Earth Sci Rev 54(1-3):231–260. https://doi.org/10.1016/S0012-8252(01)00050-2
Fan XM, Xu Q, Scaringi G et al (2017) A chemo-mechanical insight into the failure mechanism of frequently occurred landslides in the Loess Plateau, Gansu Province, China. Eng Geol 228(13):337–345. (in Chinese). https://doi.org/10.1016/j.enggeo.2017.09.003
Fredlund DG, Gan JK-M (1995) The collapse mechanism of a soil subjected to one-dimensional loading and wetting. In Derbyshire E, Dijkstra T, Smalley IJ (eds). Gen Properties Collaps Soils 468:173–205. https://doi.org/10.1007/978-94-011-0097-7_9
Fredlund DG, Morgenstern NR (1977) Stress strain variables for unsaturated soils. J Geotech Eng Div 103(5):447–466. https://doi.org/10.1139/t78-029
Fredlund DG, Rahardjo H (1993a) Soil mechanics for unsaturated soils. J Wiley and Sons, New York
Fredlund DG, Rahardjo H (1993b) Soil mechanics for unsaturated soils. John Wiley and Sons Inc, New York, pp 217–259. https://doi.org/10.1002/9780470172759
Fredlund DG, Morgenstern NR, Widger RA (1978) The shear strength of unsaturated soils. Can Geotech J 15(3):313–321. https://doi.org/10.1139/t78-029
Gao GR (1988) Formation and development of the structure of collapsing loess in China. Eng Geol 25(2-4):235–245. https://doi.org/10.1016/0013-7952(88)90029-4
Gao DH, Chen ZH, Guo N et al (2017) The influence of dry density and martic suction on the deformation and the strength characteristics of the remolded loess soils. Chin J Rock Mech Eng 36(3):736–744. (in Chinese). https://doi.org/10.13722/j.cnki.jrme.2015.1761
Garakani AA, Haeri SM, Khosravi A, Habibagahi G (2015) Hydro-mechanical behavior of undisturbed collapsible loessial soils under different stress state conditions. Eng Geol 195:28–41. https://doi.org/10.1016/j.enggeo.2015.05.026
Gibbs HJ, Holland WY (1960) Petrographic and engineering properties of loess. United States Depart Inter Bureau Reclam Eng Monogr 28:1–37. https://doi.org/10.2136/sssaj1961.03615995002500050007x
Hambley EC (1969) A new true triaxial apparatus. Geotechnique 19(2):307–309. https://doi.org/10.1680/geot.1969.19.2.307
Hoyos LR, Macari EJ (2001) Development of a stress/suction-controlled true triaxial testing device for unsaturated soils. Geotech Test J 24(1):5–13. https://doi.org/10.1520/GTJ11277J
Hoyos LR, Perez-Ruiz DD, Puppala AJ (2012) Refined true triaxial apparatus for testing unsaturated soils under suction-controlled stress paths. Int J Geomech 12(3):281–291. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000138
Ibsen LB, Praastrup U (2002) The danish rigid boundary true triaxial apparatus for soil testing. Geotech Test J 25(3):254–265. https://doi.org/10.1520/GTJ11096J
Jiang M, Shen Z (1998) Microscopic analysis of shear band in structured clay [J]. Chin J Geo Eng 20(02):102–108
Jiang MJ, Zhang FG, Hu HJ et al (2014) Structural characterization of natural loess and remolded loess under triaxial tests. Eng Geol 181(1):249–260. https://doi.org/10.1016/j.enggeo.2014.07.021
Jose B, Sridharan A, Abraham BM (1989) Log-log method for determination of preconsolidation pressure. Geotech Test J 12(3):230–237. https://doi.org/10.1520/GTJ10974J
Jotisankasa A, Ridley A, Coop M (2007) Collapse behavior of compacted silty clay in suction-monitored oedometer apparatus. J Geotech Geoenviron Eng 133(7):867–877. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:7(867)
Junior MSD, Pierce FJ (1995) A simple procedure for estimating preconsolidation pressure from soil compression curves. Soil Technol 8(2):139–151. https://doi.org/10.1016/0933-3630(95)00015-8
Kato S, Kawai K (2000) Deformation characteristics of a compacted clay in collapse under isotropic and triaxial stress state. Soils Found 40(5):75–90. https://doi.org/10.3208/sandf.40.5_75
Kirkgard MM, Lade PV (1993) Anisotropic three-dimensional behavior of a normally consolidated clay. Can Geotech J 30(5):848–858. https://doi.org/10.1139/t93-075
Ko HY, Scott RF (1967) A new soil testing apparatus. Geotechnique 17(1):40–57. https://doi.org/10.1016/0022-4898(67)90064-X
Li P, Vanapalli S, Li T (2016) Review of collapse triggering mechanism of collapsible soils due to wetting. J Rock Mech Geotech Eng 8:256–274. https://doi.org/10.1016/j.jrmge.2015.12.002
Li J, Shao SJ, Shao S (2019) Collapsible characteristics of loess tunnel site and their effects on tunnel structure. Tunnel Undergr Space Technol 83:509–519. https://doi.org/10.1016/j.tust.2018.08.035
Liu Z, Liu FY, Ma FL et al (2015) Collapsibility, composition, and microstructure of a loess in china. Can Geotech J 53:673–686. https://doi.org/10.1139/cgj-2015-0285
Luo H, Wu FQ, Chang JY et al (2018) Microstructural constraints on geotechnical properties of Malan loess: A case study from Zhaojiaan landslide in Shaanxi province, China. Eng Geol 236(26):60–69. https://doi.org/10.1016/j.enggeo.2017.11.002
Matalucci RV, Abdel-Hady M, Shelton JW (1970) Influence of grain orientation on direct shear strength of a loessial soil. Eng Geol 4(2):121–132. https://doi.org/10.1016/0013-7952(70)90008-6
Matsuoka H, Sun D, Kogane A et al (2002) Stress–strain behaviour of unsaturated soil in true triaxial tests. Can Geotech J 39(3):608–619. https://doi.org/10.1139/T02-031
Ng CWW, Sadeghi H, Jafarzadeh F (2016) Compression and shear strength characteristics of compacted loess at high suctions. Can Geotech J 54(5):690–699. https://doi.org/10.1139/cgj-2016-0347
Patil UD, Puppala AJ, Hoyos LR et al (2017) Modeling critical-state shear strength behavior of compacted silty sand via suction-controlled triaxial testing. Eng Geol 231(14):21–33. https://doi.org/10.1016/j.enggeo.2017.10.011
Pereira JHF, Fredlund DG (2000) Volume Change Behavior of Collapsible Compacted Gneiss Soil [J]. J Geotech Geoenviron Eng 126(10):907–916
Phien-Wej N, Pientong T, Balasubramaniam AS (1992) Collapse and strength characteristics of loess in Thailand. Eng Geol 32(1–2):59–72. https://doi.org/10.1016/0013-7952(92)90018-T
Porter SC (2013) Loess records | China. Encyclopedia of Quaternary Science (Second Edition). https://doi.org/10.1016/B978-0-444-53643-3.00157-6
Reddy KR, Saxena SK, Budiman JS (1992) Development of a triaxial testing apparatus. Geotech Test J 15(2):89–105. https://doi.org/10.1520/GTJ10231J
Rogers CDF, Dijkstra TA, Smalley IJ (1994) Hydroconsolidation and subsidence of loess: studies from China, Russia, North America and Europe. Eng Geol 37(2):83–113. https://doi.org/10.1016/0148-9062(95)90097-7
Rousseau DD, Derbyshire E, Antoine P et al (2013) Loess records | Europe. Encyclopedia of Quaternary Science (Second Edition) 606-619. https://doi.org/10.1016/B978-0-444-53643-3.00158-8
Ryashchenko TG, Akulova VV, Erbaeva MA (2008) Loessial soils of Priangaria, Transbaikalia, Mongolia, and northwestern China. Quat Int 179(1):90–95. https://doi.org/10.1016/j.quaint.2007.06.035
Shao SJ, Wang Q, Luo AZ et al (2017) True triaxial apparatus with rigid-flexible-flexible boundary and remolded loess testing. J Test Eval 45(3):808–817. https://doi.org/10.1520/JTE20150177
Sheng CN, Fang XW, Chen ZH (2010) The unsaturated direct shear tests of Q2 loess. Chin J Undergr Space Eng 6(4):724–728. https://doi.org/10.3969/j.issn.1673-0836.2010.04.012
Sun JM (2002) Provenance of loess material and formation of loess deposits on the Chinese Loess Plateau. Earth Planet Sci Lett 203(3):845–859. https://doi.org/10.1016/S0012-821X(02)00921-4
Sun DA, Sheng DC, Xu YF (2007) Collapse behaviour of unsaturated compacted soil with different initial densities. Can Geotech J 44(6):673–686. https://doi.org/10.1139/t07-023
Tan TK (1998) Fundamental properties of loess from northwestern China. Eng Geol 25(2-4):103–122. https://doi.org/10.1016/0013-7952(88)90022-1
Van Genuchten MT (1980) A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci Soc Am J 44(5):892–898. https://doi.org/10.2136/sssaj1980.03615995004400050002x
Wang YH, Siu WK (2006) Structure characteristics and mechanical properties of kaolinite soils-I Surface charges and structural characterizations. Can Geotech J 43(6):587–600. https://doi.org/10.1139/t06-026
Wang JD, Li P, Ma Y, Vanapalli SK (2019) Evolution of pore-size distribution of intact loess and remolded loess due to consolidation. J Soils Sediments 19(3):1226–1238. https://doi.org/10.1007/s11368-018-2136-7
Xing XL, Li TL, Fu YK (2016) Determination of the related strength parameters of unsaturated loess with conventional triaxial test. Environ Earth Sci 82:75–82. https://doi.org/10.1007/s12665-015-4797-5
Yin JH, Cheng CM, Kumruzzaman M et al (2010) New mixed boundary, true triaxial loading device for testing three-dimensional stress-strain-strength behavior of geomaterials. Can Geotech J 47(1):1–15. https://doi.org/10.1139/T09-075
Zárate MA (2013) Loess records | South America. Encyclopedia of Quaternary Science (Second Edition) pp 629-641. https://doi.org/10.1016/B978-0-444-53643-3.00160-6
Zhang Y, Shao SJ, Wang LQ, Ma L (2015) Analysis and verification of soil strength criteria in plane strain state. Rock Soil Mech 36(9):2501–2509. https://doi.org/10.16285/j.rsm.2015.09.009
Zhang MS, Hu W, Sun PP, Wang XL (2016) Advances and prospects of water sensitivity of loess and the induced loess landslides. J Earth Environ 7(4):323–334 (in Chinese). https://doi.org/10.7515/JEE201604001
Zhang Y, Hu ZQ, Xue ZJ (2018) A new method of assessing the collapse sensitivity of loess. Bull Eng Geol Environ 77(4):1287–1298. https://doi.org/10.1007/s10064-018-1372-9
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This research was financially supported by the National Natural Science Foundation of China under Grant Nos. 11572245 and 41272320.
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Shao, S., Shao, S. & Wang, J. True triaxial mechanical properties of unsaturated loess in foundation pit engineering. Bull Eng Geol Environ 80, 4751–4772 (2021). https://doi.org/10.1007/s10064-021-02108-6
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DOI: https://doi.org/10.1007/s10064-021-02108-6