| 摘要: |
| 实际工程中边坡常呈现出复杂的几何结构，本文利用有限元强度折减法讨论了三种边界条件下凹凸坡结构和不同坡度组合情况双面边坡的安全系数和破坏特性，并与单面平直边坡进行了对比分析。研究发现：在本次计算条件下，双面边坡垂直放坡时，单面平直边坡的安全系数大于凸坡；对于凸坡其他情况，全约束边界条件下安全系数最大，与平直边坡相比提高了约3%。所有形式的凹坡的安全系数均大于平直边坡，其中，全曲面凹坡在全约束边界条件下安全系数提高了近10%，约为其余样式凹坡的2倍。当双面边坡横纵坡度不等时，边坡沿危险坡面产生滑移，决定边坡整体稳定性的因素为较陡的坡度；坡度相等时，边界条件对双面边坡破坏模式的影响较为明显，不同边界条件将导致边坡不同的破坏形态，在半约束条件下，双面边坡只沿法向约束一侧产生滑移破坏，而另外两种约束条件下，其破坏区域均为对称形状。研究成果可为滑坡灾害预防或基础设施的经济设计提供依据。 |
| 关键词: 双面边坡 凹凸坡 坡度 边界条件 稳定性 |
| DOI： |
| 分类号:TU457 |
| 基金项目:国家自然科学基金项目(51478313)基于空间效应的深筒形基坑支护结构变形及稳定性整体分析方法 |
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| Stability Analysis of Complex Double-sided Slope |
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PAN Chi, LI Sa
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School of Civil Engineering,Tianjin University
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| Abstract: |
| In practice, slopes often have complex geometries. Therefore, the 3D finite element analysis with strength reduction method was used to study the safety factors and failure characteristics of double-sided slopes which have concave or convex structures with different gradient combinations under three boundary conditions, and the results are compared with that of flat slopes. It is shown that comparing with the flat slope, the safety factor of the convex vertical side slope is less than that of the flat slope. For other convex slopes, the safety factor under rough-rough boundary is increased about 3%. However, for concave slopes, the safety factor higher than that of the flat slope, and the curved surface slope with 1:2 gradient under rough-rough boundary condition is the largest, which is higher than that of the flat slope nearly 10%, and about twice as much as that of other structure of concave slopes with the same gradient. When the gradient of two sides are different, the slope will slip along the side with the large slope angle. When the gradient of two sides are equal, the slope failure area is affected by the boundary condition type. Under smooth-rough conditions, the sliding failure occurs on the constrained side, while under the other two boundary condition, the failure area is symmetrical. The results mentioned above could provide useful information for the stability analysis of 3D slope. |
| Key words: Double-sided Slope convex-concave slope gradient boundary condition Stability |
