Failure Mechanism of Two-Layered Slopes Subjected to the Surcharge Load
Publication: International Journal of Geomechanics
Volume 20, Issue 2
Abstract
For some two-layered slopes subjected to the surcharge load, the soil mass undergoes rotational or translational movement. Thus, the conventional failure mechanism of homogeneous slopes is no longer applicable. To overcome the difficulty in stability assessment of two-layered slopes, a rotational-translational failure mechanism is proposed, and it is composed of rigid blocks rotating around the center point or sliding along the layered boundary. Meanwhile, two rotational failure mechanisms (face and base failures) are modified to evaluate the stability of two-layered slopes with upper bound limit analysis. Case studies and stability charts are carried out on two-layered slopes with various surcharge loads, slope geometries, and soil strengths. The results are useful to address advantages and application differences of the three failure mechanisms in engineering practice. In addition, the comparison with the Spencer method indicates that the upper bound solution of the rotational or rotational-translational mechanism in different conditions is more rigorous because of the lower factor of safety and the more reasonable slip surface.
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Acknowledgments
This study is financially supported by the National Natural Science Foundation of China (Grant No. 51579119).
References
Bishop, A. W. 1955. “The use of the slip circle in the stability analysis of slopes.” Géotechnique 5 (1): 7–17. https://doi.org/10.1680/geot.1955.5.1.7.
Chen, W. F. 1975. Limit analysis and soil plasticity. Amsterdam, Netherlands: Elsevier.
Cheng, Y. M., T. Lansivaara, and W. B. Wei. 2007. “Two-dimensional slope stability analysis by limit equilibrium and strength reduction methods.” Comput. Geotech. 34 (3): 137–150. https://doi.org/10.1016/j.compgeo.2006.10.011.
Cornforth, D. H. 2005. Landslides in practice. Hoboken, NJ: Wiley.
Deng, D. P., L. Li, and L. H. Zhao. 2019. “Stability analysis of a layered slope with failure mechanism of a composite slip surface.” Int. J. Geomech. 19 (6): 04019050. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001417.
Gao, Y. F., F. Zhang, G. H. Lei, and D. Y. Li. 2013. “An extended limit analysis of three-dimensional slope stability.” Géotechnique 63 (6): 518–524. https://doi.org/10.1680/geot.12.T.004.
Griffiths, D. V., and P. A. Lane. 1999. “Slope stability analysis by finite elements.” Géotechnique 49 (3): 387–403. https://doi.org/10.1680/geot.1999.49.3.387.
Kumar, J., and P. Samui. 2006. “Stability determination for layered soil slopes using the upper bound limit analysis.” Geotech. Geol. Eng. 24 (6): 1803–1819. https://doi.org/10.1007/s10706-006-7172-1.
Michalowski, R. L. 2002. “Stability charts for uniform slopes.” J. Geotech. Geoenviron. Eng. 128 (4): 351–355. https://doi.org/10.1061/(ASCE)1090-0241(2002)128:4(351).
Michalowski, R. L. 2010. “Limit analysis and stability charts for 3D slope failures.” J. Geotech. Geoenviron. Eng. 136 (4): 583–593. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000251.
Michalowski, R. L., and A. Drescher. 2009. “Three-dimensional stability of slopes and excavations.” Géotechnique 59 (10): 839–850. https://doi.org/10.1680/geot.8.P.136.
Ni, P. P., S. H. Wang, S. M. Zhang, and L. Mei. 2016. “Response of heterogeneous slopes to increased surcharge load.” Comput. Geotech. 78 (Sep): 99–109. https://doi.org/10.1016/j.compgeo.2016.05.007.
Qin, C. B., and S. C. Chian. 2017. “Kinematic stability of a two-stage slope in layered soils.” Int. J. Geomech. 17 (9): 06017006. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000928.
Qin, C. B., and S. C. Chian. 2018a. “Bearing capacity analysis of a saturated non-uniform soil slope with discretization-based kinematic analysis.” Comput. Geotech. 96 (Apr): 246–257. https://doi.org/10.1016/j.compgeo.2017.11.003.
Qin, C. B., and S. C. Chian. 2018b. “Seismic bearing capacity of non-uniform soil slopes using discretization-based kinematic analysis considering Rayleigh waves.” Soil Dyn. Earthquake Eng. 109 (Jun): 23–32. https://doi.org/10.1016/j.soildyn.2018.02.017.
Sun, Z. B., J. F. Li, Q. J. Pan, D. Dias, S. Q. Li, and C. Q. Hou. 2018. “Discrete kinematic mechanism for nonhomogeneous slopes and its application.” Int. J. Geomech. 18 (12): 04018171. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001303.
Tan, D., and S. K. Sarma. 2008. “Finite element verification of an enhanced limit equilibrium method for slope analysis.” Géotechnique 58 (6): 481–487. https://doi.org/10.1680/geot.2008.58.6.481.
Tu, Y. L., X. R. Liu, Z. L. Zhong, and Y. Y. Li. 2016. “New criteria for defining slope failure using the strength reduction method.” Eng. Geol. 212 (Sep): 63–71. https://doi.org/10.1016/j.enggeo.2016.08.002.
Wang, Z. B., and L. Yao. 2017. “Analysis of stability and failure mechanism of horizontal stratified soil slope.” [In Chinese.] J. Cent. South Univ. 48 (7): 1915–1922.
Xu, J. S., and X. L. Yang. 2018. “Seismic and static stability analysis for 3D reinforced slope in nonhomogeneous and anisotropic soils.” Int. J. Geomech. 18 (7): 04018065. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001177.
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©2019 American Society of Civil Engineers.
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Received: Jan 24, 2019
Accepted: Jul 15, 2019
Published online: Dec 13, 2019
Published in print: Feb 1, 2020
Discussion open until: May 13, 2020
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