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Discussion of the Influence of the Sliding Surface Shape on Slope Stability under Rainfall and Water Level Change of Reservoir
DOI: 10.12677/HJCE.2019.87135, PDF, HTML, XML, 下载: 585  浏览: 809

Abstract: Based on the FEM analysis of unsaturated seepage of slope and strength of unsaturated soil, adopted the assumption of rigid body limit equilibrium, we compose a calculation program called USSP. By using the program, the variations of safety of landslides of which the slice is up concave and line under rainfall and water level change of reservoir are researched, and the impact of permeation, buoyancy and rainfall to glide force and antislice force are also analyzed. The results show that: to the slide which slice is up concave, the impact of buoyancy is significant and related closely to water change, and the most dangerous condition is stable high water level. To the slide which slice is line, the impact of permeation is significant and related closely to water change too, and the most dangerous condition is at the beginning of reaching the low water level.

1. 概述

2. 基本理论和方法

2.1. 非饱和土渗流

$\frac{\partial }{\partial x}\left[{K}_{x}\left(h\right)\frac{\partial \phi }{\partial x}\right]+\frac{\partial }{\partial y}\left[{K}_{y}\left(h\right)\frac{\partial \phi }{\partial y}\right]=C\left(h\right)\frac{\partial \phi }{\partial t}$ (1)

① 边界条件：

$\begin{array}{l}\phi {|}_{S1}={\phi }_{b}\left(x,y,z,t\right)\\ {k}_{x}\frac{\partial \phi }{\partial x}\mathrm{cos}\left(n,x\right)+{k}_{y}\frac{\partial \phi }{\partial y}\mathrm{cos}\left(n,y\right){|}_{S2}=q\end{array}$ (2)

② 初始条件

$\varphi {|}_{t=0}=\varphi {}_{0}\left(x,y,z\right)$ (3)

2.2. 非饱和土强度

${\tau }_{f}=c+\sigma \mathrm{tan}\phi +s\mathrm{tan}{\phi }^{b}$ (4)

3. 滑坡稳定性系数计算及讨论

Table 1. The material parameters of landslide

3.1. 滑带为下凹型滑坡

Figure 1. The section of landslide

1) 工况一安全系数变化规律

Figure 2. The changes of slope safety under condition 1

2) 工况一浮托减重作用分析

Figure 3. The change of glide force versus deadweight glide force

Figure 4. The change of antislip force versus deadweight antislip force

3) 工况二安全系数变化规律

Figure 5. The change of safety under condition 2

4) 工况二降雨入渗影响分析

3.2. 滑带为直线型边坡

Figure 6. The section of landslide

1) 工况一安全系数变化规律

Figure 7. The changes of slope safety under condition 1

2) 工况一浮托减重作用分析

Figure 8. The change of glide force versus deadweight glide force

Figure 9. The change of antislip force versus deadweight antislip force

Figure 10. The change of glide force versus deadweight glide force

Figure 11. The change of antislip force versus deadweight antislip force

4. 结语

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