降雨入渗条件下土质边坡的稳定性分析

徐全; 谭晓慧; 沈梦芬

降雨入渗条件下土质边坡的稳定性分析 English Version

(合肥工业大学资源与环境工程学院，安徽合肥 230009)

详细信息

作者简介:
徐全(1990– )，男，安徽芜湖人，本科生，主要从事岩土力学与工程方面的研究工作。

中图分类号: TU47
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出版历程
- 收稿日期: 2012-11-12
- 发布日期: 2012-11-12

Stability analysis of soil slopes under rainfall infiltration

(School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

摘要

摘要: 降雨对边坡的稳定性具有重要影响。在降雨作用下，土坡中的饱和度及含水率增加，基质吸力减小，而水、气压力的变化又影响着土体骨架的变形。文章基于饱和–非饱和渗流分析及强度折减法，对降雨作用下的土质边坡进行了固体和流体的耦合分析及不耦合分析，研究了饱和渗透系数及降雨强度对边坡安全系数及滑面位置的影响，并分析了安全系数及滑面位置与时间的关系。研究表明：土体的饱和渗透系数对边坡的稳定性影响很大；对于渗透性较好的土体，降雨强度越大，在降雨作用下边坡的安全系数变化程度也越大，安全系数降低及恢复的速度也越快；对于渗透性较差的土体，降雨强度对边坡稳定性的影响有限；在相同的计算条件下，不耦合分析对应的安全系数小于耦合分析的相应值；在不同强度的降雨作用下，滑面位置变化的范围有所不同，不耦合分析的滑面位置变化范围主要出现在坡肩，而耦合分析的滑面位置变化范围主要出现在坡脚。
- 边坡 /
- 稳定性 /
- 降雨 /
- 耦合分析 /
- 渗流 /
- 土水特征曲线
Abstract: Rainfall has a large effect on the stability of soil slopes. Under rainfall infiltration, the degree of saturation and water content of soil slope increase, and the matrix suction decreases. On the other hand, change of fluid pressure affects the deformation of soil skeleton. Based on the saturated-unsaturated seepage analysis and the strength reduction method, the coupled and uncoupled analysis of a soil slope under rainfall infiltration is analyzed. The influence of the coefficient of saturated hydraulic conductivity and the rainfall intensity on the slope stability is studied, and the relationship between the factor of safety and the position of sliding surface is obtained. This study illustrates that the saturated hydraulic conductivity has a large effect on slope stability. If the permeability of soils is relatively large, the changing range and velocity of the factor of safety increase with the rainfall intensity; and if it is relatively small, the influence of the rainfall intensity on the slope stability is also small. Under the same conditions, the factor of safety of uncoupled analysis is less than that of the coupled analysis. The position of the potential sliding surface varies with different rainfall intensities, e.g., the variation region of the sliding surface of uncoupled analysis occurs at the shoulder of the slope, while that of coupled analysis appears at the toe of the slope.
- slope /
- stability /
- rainfall /
- coupled analysis /
- seepage /
- soil-water characteristic curve

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参考文献(14)

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文章访问数: 1551
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降雨入渗条件下土质边坡的稳定性分析 English Version

作者简介: 徐 全(1990– )，男，安徽芜湖人，本科生，主要从事岩土力学与工程方面的研究工作。

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出版历程

Stability analysis of soil slopes under rainfall infiltration

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出版历程

目录

作者简介:
徐全(1990– )，男，安徽芜湖人，本科生，主要从事岩土力学与工程方面的研究工作。