Failure Mechanism and Stability Evaluation of Bedding Slopes Considering Lateral Wall Resistance

ZHAO Haisong; ZHANG Le; WU Kai; WEI Anhui; XIANG Bo; SHAO Jiang; ZHANG Junyun

doi:10.13409/j.cnki.jdpme.20221111002

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Failure Mechanism and Stability Evaluation of Bedding Slopes Considering Lateral Wall Resistance

更新时间：2025-09-25

- Failure Mechanism and Stability Evaluation of Bedding Slopes Considering Lateral Wall Resistance
- Journal of Disaster Prevention and Mitigation Engineering Vol. 44, Issue 2, Pages: 404-414(2024)
- 作者机构：
  
  1.四川省公路规划勘察设计研究院有限公司,四川成都 610041
  2.西南交通大学土木工程学院,四川成都 610031
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.20221111002
  CLC： P642
- Received：11 November 2022，
  
  Revised：2022-12-20，
  
  Published：25 April 2024
- 稿件说明：
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赵海松,张乐,邬凯等.考虑侧壁阻力的顺层边坡失稳机制及稳定性评价[J].防灾减灾工程学报,2024,44(02):404-414.

ZHAO Haisong,ZHANG Le,WU Kai,et al.Failure Mechanism and Stability Evaluation of Bedding Slopes Considering Lateral Wall Resistance[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):404-414.
赵海松,张乐,邬凯等.考虑侧壁阻力的顺层边坡失稳机制及稳定性评价[J].防灾减灾工程学报,2024,44(02):404-414. DOI： 10.13409/j.cnki.jdpme.20221111002.

ZHAO Haisong,ZHANG Le,WU Kai,et al.Failure Mechanism and Stability Evaluation of Bedding Slopes Considering Lateral Wall Resistance[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):404-414. DOI： 10.13409/j.cnki.jdpme.20221111002.

摘要

侧壁阻力作用下，顺层边坡主滑方向将偏离岩层倾向，其变形及失稳机制具有典型特征。以四川盆地马边河流域某顺层边坡为例，基于其工程地质条件，总结顺层边坡不同变形区域的特征，结合失稳边界条件研究了考虑侧壁阻力的顺层边坡失稳演化机制；最后，对比主滑方向偏离岩层倾向与否的受力差异，分析考虑侧壁阻力的顺层边坡三维稳定性，并研究了各影响因素的作用效应。结果表明：（1）考虑侧壁阻力的顺层边坡变形可划为失稳滑走区、滑坡区和稳定区，滑坡区包含滑动区和蠕滑变形区，滑动区岩体滑动后解体风化为碎、块石土，蠕滑变形区受侧壁阻力影响岩体仅变形拉裂；（2）顺层边坡经岩体劣化和前缘临空后，总体呈下部滑动、中部蠕滑拉裂的顺层临空⁃后退式破坏；滑动区边界受前缘及侧壁临空控制，长度与侧壁冲沟下切段长度相近；蠕滑变形区部分侧壁由节理面转化为挤压带，侧壁阻力增大，稳定性高于临界失稳状态；受侧壁阻力及滑体厚度控制，蠕滑变形区与稳定区界限处因滑体厚度削薄而拉裂；（3）建立了考虑侧壁阻力的顺层边坡稳定性系数计算式，以及岩层倾角

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=57720380&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=57720378&type=

1.69333339

2.37066650

、滑面倾角

、主滑方向偏离岩层倾向夹角

三角度间的换算关系式，侧壁摩擦系数和

越大，侧壁阻力越利于顺层边坡稳定。

Abstract

Under the influence of lateral wall resistance

the main sliding direction of a bedding slope deviates from the direction of rock layer orientation

exhibiting typical features in its deformation and failure mechanisms. Taking a bedding slope in the Mabian River of Sichuan basin as a case study

we summarized the slope deformation characteristics of different areas based on its engineering geological conditions. Then

we analyzed the evolution mechanism of bedding slope failure considering lateral wall resistance and the failure boundary conditions. Finally

the three-dimensional stability of bedding slope under the effect of lateral wall resistance was analyzed

and the effects of various influencing factors were studied by comparing the stress differences experienced when the main sliding direction deviated from or aligned with the rock layer orientation. The results showed that: (1) Considering lateral wall resistance

the deformation of a bedding slope could be categorized into an unstable sliding zone

landslide zone

and stable zone. The landslide zone included a sliding zone and a creep-slippage zone. After sliding

the rock mass in the sliding zone disintegrated and weathered into broken and block soil

and the creep-slippage zone experienced only deformation and cracking under the effect of lateral wall resistance. (2) After rock mass deterioration and the appearance of free surface at its forefront

the bedding slope presented a bedding-plane free-fall-backward failure with sliding in the lower part and creep-cracking in the middle part. The boundary of the sliding zone was controlled by the leading edge and the free face of the lateral wall

with its sliding distance being similar to that of the undercut segment of gully sidewall. The lateral wall was transformed from a joint face into a compression zone in parts of the creep-slippage zone

increasing the lateral wall resistance and resulting in a higher stability than the critical instability state. The boundary between the creep-slippage zone and the stable zone was cracked due to the thinning of the sliding mass thickness and the lateral wall resistance. (3) A formula for the stability coefficient of the bedding slope considering side-wall resistance was developed

as well as a conversion equation between the rock layer dip angle

slip surface dip angle

and the angle

between the main slip direction and the rock layer orientation. The results showed that the larger the

and the friction coefficient of lateral wall

the greater the contribution of the resistance to the stability of bedding slopes.

关键词

Keywords

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