Slip surface ascertaining and stability analyzing of the countertendency shale slope

YIN Xi-jie; YAN E-chuan; SUN Zhao-lai

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Slip surface ascertaining and stability analyzing of the countertendency shale slope

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- Slip surface ascertaining and stability analyzing of the countertendency shale slope
- Vol. 28, Issue S1, (2007)
- 作者机构：
  
  中国地质大学工程学院,武汉,430074
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU454
- Online First：28 March 2014，
  
  Published：2007
- 稿件说明：
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YIN Xi-jie, YAN E-chuan, SUN Zhao-lai. Slip surface ascertaining and stability analyzing of the countertendency shale slope[J]. 2007, 28(S1).
DOI：

YIN Xi-jie, YAN E-chuan, SUN Zhao-lai. Slip surface ascertaining and stability analyzing of the countertendency shale slope[J]. 2007, 28(S1). DOI：

摘要

破坏面确定是边坡稳定性分析的基础，存在各级滑动面。不同结构类型边坡，其确定方法也随之不同。对于反倾软岩边坡，不能通过不连续面空间展布分析确定其破坏面。联合FLAC3D和极限平衡方法分析具有节理块体切割破坏模式的某反倾页岩边坡稳定性。在野外调查基础上分析边坡的变形破坏机制，应用FLAC3D研究其应力、应变等值线及相应增量等值线图确定边坡潜在最危险滑动面和次级滑动面，计算其稳定性系数。在防护设计中考虑次级滑动面，针对边坡危险区域分析其防护效果。应用强度折减计算两危险区域稳定性系数，表明防护后边坡整体稳定性较好。该方法对反倾软岩边坡的稳定性分析有一定的借鉴价值，在防护设计中考虑次级滑动面的影响具有一定的实际指导意义。

Abstract

The slip surface

which has different grades

is the base of the slope stability analysis and the methods for ascertaining it are different with the different slope structures. For countertendency soft rock slope，it can not be ascertained from the distribution of discontinuities as usual. Combined with FLAC3D and limit equilibrium method

the stability of countertendency shale slope with block cutting by discontinuities failure model is analyzed. Based on the field investigation

the deformation and failure mechanism is studied

the different grades slip surfaces are obtained from the analysis of the strain

stress and their increment pictures from FLAC3D analysis and the factor of safety is computed respectively. The prevention schemes are decided with the considering of the sub slip surface and the prevention effect is analyzed by aiming at the dangerous area. The safety factors of two dangerous areas

which are computed by shear strength reduction

indicate that the stability of the slope after prevention is good. The method used in this paper can be used as a reference to analyzing the stability of countertendency soft rock slope. The consideration of sub slip surface in prevention design has some practical guiding values

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