Investigation of the sequential excavation of a soil-rock-mixture slope using the numerical manifold method

doi:10.1016/j.enggeo.2019.05.005

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	Investigation of the sequential excavation of a soil-rock-mixture slope using the numerical manifold method
	Yang, Yongtao ; Sun, Guanhua ; Zheng, Hong ; Qi, Yi
刊名	ENGINEERING GEOLOGY
	2019
卷号	256 期号:-页码:93-109
关键词	Numerical manifold method (NMM) Sequential excavation Soil-rock-mixture slope Shear strength reduction technique phi-upsilon inequality Factor of safety (FOS)
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2019.05.005
英文摘要	To investigate the stability of a soil-rock-mixture (SRM) slope subjected to sequential excavation, two modifications are made to the numerical manifold method (NMM). One modification is the implementation of sequential excavation algorithms including an algorithm to find the excavated manifold elements and an algorithm named as "manifold element birth and death" to remove the excavated manifold elements in the excavation simulation. The other modification is the implementation of an improved shear strength reduction technique to evaluate the stability of a slope, as well as to obtain the factor of safety (FOS). In this technique, apart from the shear strength parameters, the Poisson's ratio upsilon is also adjusted for the purpose of eliminating the spurious plastic deformation that may happen in the deep areas of the slope. Two criterions including the NC criterion (Non-convergence criterion) and DPZ criterion (The criterion based on the distribution of plastic zones) are used to define the critical equilibrium state of the slope. With the improved NMM, three numerical examples including a homogeneous slope under one step of excavation, a slope under three steps of excavation and a SRM slope under two steps of excavation are solved. The simulation results show that: (1) the improved NMM is able to accurately simulate the excavation process of slopes, and predict the FOSs of slopes; (2) the FOSs based on the NC criterion are usually greater than or equal to those based on the DPZ criterion; (3) it is very difficult to form a slipping surface passing from the toe of the SRM slope to the top of the SRM slope; (4) rock blocks have some positive effects on the stability of a SRM slope.
WOS研究方向	Engineering ; Geology
语种	英语
WOS记录号	WOS:000472690300007
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14965]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China; 2.Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yongtao,Sun, Guanhua,Zheng, Hong,et al. Investigation of the sequential excavation of a soil-rock-mixture slope using the numerical manifold method[J]. ENGINEERING GEOLOGY,2019,256(-):93-109.
APA	Yang, Yongtao,Sun, Guanhua,Zheng, Hong,&Qi, Yi.(2019).Investigation of the sequential excavation of a soil-rock-mixture slope using the numerical manifold method.ENGINEERING GEOLOGY,256(-),93-109.
MLA	Yang, Yongtao,et al."Investigation of the sequential excavation of a soil-rock-mixture slope using the numerical manifold method".ENGINEERING GEOLOGY 256.-(2019):93-109.