DOI QR코드

DOI QR Code

Water-induced changes in mechanical parameters of soil-rock mixture and their effect on talus slope stability

  • Xing, Haofeng (Department of Geotechnical Engineering, Tongji University) ;
  • Liu, Liangliang (Department of Geotechnical Engineering, Tongji University) ;
  • Luo, Yong (Department of Geology Survey and Design, Guizhou Transportation Planning Survey and Design Academe Co., Ltd.)
  • 투고 : 2018.12.26
  • 심사 : 2019.06.15
  • 발행 : 2019.07.20

초록

Soil-rock mixture (S-RM) is an inhomogeneous geomaterial that is widely encountered in nature. The mechanical and physical properties of S-RM are important factors contributing towards different deformation characteristics and unstable modes of the talus slope. In this paper, the equivalent substitution method was employed for the preparation of S-RM test samples, and large-scale triaxial laboratory tests were conducted to investigate their mechanical parameters by varying the water content and confining pressure. Additionally, a simplified geological model based on the finite element method was established to compare the stability of talus slopes with different strength parameters and in different excavation and support processes. The results showed that the S-RM samples exhibit slight strain softening and strain hardening under low and high water content, respectively. The water content of S-RM also had an effect on decreasing strength parameters, with the decrease in magnitude of the cohesive force and internal friction angle being mainly influenced by the low and high water content, respectively. The stability of talus slope decreased with a decrease in the cohesion force and internal friction angle, thereby creating a new shallow slip surface. Since the excavation of toe of the slope for road construction can easily cause a landslide, anti-slide piles can be used to effectively improve the slope stability, especially for shallow excavations. But the efficacy of anti-slide piles gradually decreases with increasing water content. This paper can act as a reference for the selection of strength parameters of S-RM and provide an analysis of the instability of the talus slope.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

  1. Anbazhagan, S., Ramesh, V. and Saranaathan, S.E. (2017), "Cut slope stability assessment along ghat road section of Kolli hills, India", Nat. Hazards, 86(3), 1081-1104. https://doi.org/10.1007/s11069-016-2731-0.
  2. Brandes, H.G., Robertson, I.N. and Johnson, G.P. (2011), "Soil and rock properties in a young volcanic deposit on the island of Hawaii", J. Geotech. Geoenviron. Eng., 137(6), 597-610. http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0000453.
  3. Butalia, T.S., Huang, J., Kim, D.G. and Croft, F. (2003), "Effect of moisture content and pore water pressure build on resilient modulus of cohesive soils", Proceedings of the Symposium on Resilient Modulus Testing for Pavement Components, Salt Lake City, Utah, U.S.A.
  4. Cabalar, A.F. and Mustafa, W.S. (2015), "Fall cone tests on claysand mixtures", Eng. Geol., 192, 154-165. https://doi.org/10.1016/j.enggeo.2015.04.009.
  5. Cen, D.F., Huang, D. and Ren, F. (2017), "Shear deformation and strength of the interphase between the soil-rock mixture and the benched bedrock slope surface", Acta Geotech., 12(2), 391-413. https://doi.org/10.1007/s11440-016-0468-2.
  6. Chang, W.J. and Phantachang, T. (2016), "Effects of gravel content on shear resistance of gravelly soils", Eng. Geol., 207(3), 78-90. https://doi.org/10.1016/j.enggeo.2016.04.015.
  7. Dimitrova, R.S. and Yanful, E.K. (2012), "Factors affecting the shear strength of mine tailings/clay mixtures with varying clay content and clay mineralogy", Eng. Geol., 125(1), 11-25. https://doi.org/10.1016/j.enggeo.2011.10.013.
  8. DL/T5356 (2006), "Code for coarse-grained soil tests for hydropower and water conservancy engineering", Professional Standards Compilation Group of People's Republic of China, China Water Power Press, Beijing, China.
  9. Fei, K. (2016), "Experimental study of the mechanical behavior of clay-aggregate mixtures", Eng. Geol., 210, 1-9. https://doi.org/10.1016/j.enggeo.2016.05.011.
  10. Huang, S.L., Ding, X.L., Zhang, Y.T. and Cheng, W. (2015), "Triaxial test and mechanical analysis of rock-soil aggregate sampled from natural sliding mass", Adv. Mater. Sci. Eng., 1-14. http://dx.doi.org/10.1155/2015/238095.
  11. Jiang, X.G., Cui, P. and Ge, Y.G. (2015), "Effects of fines on the strength characteristics of mixtures", Eng. Geol., 198, 78-86. https://doi.org/10.1016/j.enggeo.2015.09.011.
  12. Kanungo, D.P., Pain, A. and Sharma, S. (2013), "Finite element modeling approach to assess the stability of debris and rock slopes: a case study from the Indian Himalayas", Nat. Hazards, 69(1), 1-24. https://doi.org/10.1007/s11069-013-0680-4.
  13. Li, C.S., Zhang, D., Du, S.S. and Shi, B. (2016), "Computed tomography based numerical simulation for triaxial test of soilrock mixture", Comput. Geotech., 73, 179-188. https://doi.org/10.1016/j.compgeo.2015.12.005.
  14. Liu, J., Wei, J.H., Hu, H., Wu, J.M., Sun, S.R. and Kanungo, D.P. (2017), "Research on the engineering geological conditions and stability evaluation of the B2 talus slide at the Jin'an Bridge hydropower station, China", Bull. Eng. Geol. Environ., 77(1), 105-125. https://doi.org/10.1007/s10064-017-1005-8.
  15. Liu, Z.Q., Huang, H.W. and Xue, Y.D. (2009), "The application of quantitative risk assessment in talus slope risk analysis", Georisk, 3(3), 155-163. https://doi.org/10.1080/17499510902802644.
  16. Mohammadi, S. and Taiebat, H. (2016), "Finite element simulation of an excavation-triggered landslide using large deformation theory", Eng. Geol., 205, 62-72. https://doi.org/10.1016/j.enggeo.2016.02.012.
  17. Moradi, G., Abdolmaleki, A., Soltani, P. and Ahmadvand, M. (2018), "A laboratory and numerical study on the effect of geogrid-box method on bearing capacity of rock-soil slopes", Geomech. Eng., 14(4), 345-354. https://doi.org/10.12989/gae.2018.14.4.345.
  18. Sun, S.R., Xu, P.L., Wu, J.M., Wei, J.H., Fu, W.G., Liu, J. and Kanungo, D.P. (2014), "Strength parameter identification and application of soil-rock mixture for steep-walled talus slopes in southwestern China", Bull. Eng. Geol. Environ., 73(1), 123-140. https://doi.org/10.1007/s10064-013-0524-1.
  19. Tan, X., Konietzky, H. and Chen, W. (2016), "Numerical simulation of heterogeneous rock using discrete element model based on digital image processing", Rock Mech. Rock Eng., 49(12), 4957-4964. https://doi.org/10.1007/s00603-016-1030-0.
  20. Vallejo, L.E. (2001), "Interpretation of the limits in shear strength in binary granular mixtures", Can. Geotech. J., 38(5), 1097-1104. https://doi.org/10.1139/t01-029.
  21. Wang, S.L., Xu, W.Y., Shi, C. and Zhang, Q. (2014), "Numerical simulation of direct shear tests on mechanical properties of talus deposits based on self-adaptive PCNN digital image processing", J. Central South Univ., 21(7), 2904-2914. https://doi.org/10.1007/s11771-014-2256-1.
  22. Wang, Y. and Li, X. (2014), "Experimental study on cracking damage characteristics of a soil and rock mixture by UPV testing", Bull. Eng. Geol. Environ., 74(3), 775-788. https://doi.org/10.1007/s10064-014-0673-x.
  23. Wang, Y., Li, X. and Zheng, B. (2017), "Stress-strain behavior of soil-rock mixture at medium strain rates-Response to seismic dynamic loading", Soil Dyn. Earthq. Eng., 93, 7-17. https://doi.org/10.1016/j.soildyn.2016.10.020.
  24. Wang, Y., Li, X., Zheng, B., Zhang, B. and Wang, J.B. (2015), "Real-time ultrasonic experiments and mechanical properties of soil and rock mixture during triaxial deformation", Geotech. Lett., 5, 281-286. http://dx.doi.org/10.1680/jgele.15.00131.
  25. Xu, M., Song, E.X. and Cao, G.X. (2009), "Compressibility of broken rock-fine grain soil mixture", Geomech. Eng., 1(2), 169-178. https://doi.org/10.12989/gae.2009.1.2.169.
  26. Xu, W.J., Hu, R.L. and Tan, R.J. (2007), "Some geomechanical properties of soil-rock mixtures in the Hutiao Gorge area, China", Geotechnique, 57(3), 255-264. http://dx.doi.org/10.1680/geot.2007.57.3.255.
  27. Xu, W.J., Li, C.Q. and Zhang, H.Y. (2015), "DEM analyses of the mechanical behavior of soil and soil-rock mixture via the 3D direct shear test", Geomech. Eng., 9(6), 815-827. http://dx.doi.org/10.12989/gae.2015.9.6.815.
  28. Xu, W.J., Xu, Q. and Hu, R.L. (2011), "Study on the shear strength of soil-rock mixture by large scale direct shear test", Int. J. Rock Mech. Min. Sci., 48(8), 1235-1247. https://doi.org/10.1016/j.ijrmms.2011.09.018.
  29. Xu, W.J., Yue, Z.Q. and Hu, R.L. (2008), "Study on the mesostructure and mesomechanical characteristics of the soil-rock mixture using digital image processing based finite element method", Int. J. Rock Mech. Min. Sci., 45(5), 749-762. https://doi.org/10.1016/j.ijrmms.2007.09.003.
  30. Zhang, H.Y., Xu, W.J. and Yu, Y.Z. (2016a), "Numerical analysis of soil-rock mixture's meso-mechanics based on biaxial test", J. Central South Univ., 23(3), 685-700. https://doi.org/10.1007/s11771-016-3114-0.
  31. Zhang, H.Y., Xu, W.J. and Yu, Y.Z. (2016b), "Triaxial tests of soilrock mixtures with different rock block distributions", Soils Found., 56(1), 44-56. https://doi.org/10.1016/j.sandf.2016.01.004.
  32. Zhong, S.Q., Zhong, M., Wei, C.F., Zhang, W.H. and Hu, F.N. (2016), "Shear strength features of soils developed from purple clay rock and containing less than two-millimeter rock fragments", J. Mountain Sci., 13(8), 1464-1480. https://doi.org/10.1007/s11629-015-3524-8.
  33. Zhou, Z., Yang, H., Xing, K. and Gao, W.Y. (2018), "Prediction models of the shear modulus of normal or frozen soil-rock mixtures", Geomech. Eng., 15(2), 783-791. https://doi.org/10.12989/gae.2018.15.2.783.

피인용 문헌

  1. Strength degradation of a natural thin-bedded rock mass subjected to water immersion and its impact on tunnel stability vol.21, pp.1, 2020, https://doi.org/10.12989/gae.2020.21.1.063
  2. Stability of a Rock Tunnel Passing through Talus-Like Formations: A Case Study in Southwestern China vol.2021, 2021, https://doi.org/10.1155/2021/5453764
  3. Landslide susceptibility assessment using feature selection-based machine learning models vol.25, pp.1, 2019, https://doi.org/10.12989/gae.2021.25.1.001
  4. Numerical Modelling-Based Stability Analysis of Waste Dump Slope Structures in Open-Pit Mines-A Review vol.102, pp.2, 2019, https://doi.org/10.1007/s40033-021-00277-y