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 水利水运工程学报   2019 Issue (2): 8-15.  DOI: 10.16198/j.cnki.1009-640X.2019.02.002 0

### 引用本文 [复制中英文]

[复制中文]
YANG Min, LI Ning, LI Hongru, et al. Evaluation of stability of toppling slope by increment method of anchoring cable stress[J]. Hydro-science and Engineering, 2019(2): 8-15. (in Chinese) DOI: 10.16198/j.cnki.1009-640X.2019.02.002.
[复制英文]

### 文章历史

1 边坡预应力锚索稳定性评价方法

 图 1 锚索单元几何模型[10] Fig.1 Sketch map of geometric model of anchor cable element[10]

 $\Delta \sigma =(\Delta L/L)E{{A}_{0}}$ (1)

 $K=1-\frac{\Delta \sigma -0.15\sigma }{0.15\sigma }$ (2)

2 某水电站左岸坝轴线边坡锚索加固稳定性分析 2.1 工程概况

2.2 有限元分析模型建立

 图 2 数值分析概化模型及坡表关键点 Fig.2 Generalization model of numerical analysis and key points of slope table

2.3 岩体及结构面计算参数

2.4 影响因素数值模拟加载方式

2.5 预应力锚索设计加固方案

 图 3 各锚索加固方案 Fig.3 Schematic diagram of anchorage for various schemes
2.6 各工况各设计加固方案变形分析

 图 4 各方案坡表关键点水平位移曲线 Fig.4 Horizontal displacement curve at key points of each scheme

2.7 加固方案稳定系数分析

2.8 最危险工况各加固方案分析

 图 5 各方案暴雨工况的变形 Fig.5 Deformation field of various schemes of rainstorm
 图 6 各方案暴雨工况的位移 Fig.6 Displacement field of various schemes of rainstorm
 图 7 各方案暴雨工况的应力 Fig.7 Stress field of various schemes of rainstorm

3 结语

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Evaluation of stability of toppling slope by increment method of anchoring cable stress
YANG Min , LI Ning , LI Hongru , LI Guofeng
Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China
Abstract: After the pre-stressed anchor cable is reinforced, the mechanical property of slope rock mass is improved so as to lead to change of stress state. It will not be very reasonable if evaluation is made according to the normal stability of slope at this moment. Hence, in this paper, the mechanical properties of supporting structure are proposed and adopted to represent the stability of slope after reinforcement. Specifically, the difference value between the stress increment and the permissible stress increment caused by deformation of pre-stressed anchor cable under various working conditions is used, that is, the stability of slope can be indicated with the specific value of the difference value and permissible stress increment. The slope of axis of dam on the left bank of a certain hydropower station has features of high natural bank, large natural angle of repose and gneissic schistosity steep dip off the shore. Also, the steep dip crack and the flat crack perpendicular to gneissic schistosity are the main factors controlling the stability of slope. In this paper, the deformation analysis model of excavation of slope on the left bank is built through combination of site geological data, monitoring data and investigation conditions and utilization of discretization finite element software FINAL. A comparative study is made on the stability of slope of different design schemes of pre-stressed anchor cable reinforcement under three types of working conditions. The stability coefficient of slope is calculated by using the safety stability coefficient equation proposed in this paper to come to a conclusion that the working conditions of storm rainfall are the most dangerous working conditions. Then the deformation field, displacement field and stress field under the most dangerous working conditions are analyzed. The research findings have some reference value for subsequent reinforcement of the slope of the dam axis of the left bank.
Key words: counter-tilt slopes    stability    pre-stressed anchor cable