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STUDY AND PREDICTION OF SLOPE FAILURE BY HEAVY RAIN

暴雨导致的边坡破坏研究与预测

基本信息

批准号：
10044153
负责人：
TATEYAMA Kazuyoshi
金额：
$ 6.85万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10044153/
关键词：
Slope failure Heavy rain Suction Unsaturated soil In-situ test Shear strength Stability analysis 室内実験不飽和士

项目摘要

The following four topics of research have been carried out to understand the mechanism of the slope failure during heavy rain and to develop a method to predict the slope failure due to the heavy rain.(1) Mechanism of the strength reduction of the soil by the rainThe mechanism, that the strength of the soil decreases during the rain, has been investigated by studying the effect of the pore water to the strength of the unsaturated soil. Some models were suggested to express the action of the capillary water in the ground, and the relation between the change of volume of the pore water and the shear strength of the soil was discussed with the numerical analysis.(2) Seepage of the rain water into the groundThe numerical analysis have been carried out to investigate the seepage of the water into the ground during heavy rain, and to understand the time-depending process of the change in the water containing conditions of the ground during and after the rain.(3) Measurement of the suction on the fieldThe monitoring method of the suction of the soil has been developed to grasp of the change of the strength conditions of the soil in the ground during and after the rain.(4) Numerical analysis for the slope failureSome numerical simulations have been carried out to study the change in the degree of the stability of the slope during and after the rain. The relation of the rain to the stability of the slope was simulated with the parameter of the rain strength, soil properties and the shape of the slope, and the measurement of the suction was confirmed to be effective as the monitoring method of the slope stability.

本研究透过以下四个课题，探讨暴雨下边坡失稳的机制，并发展暴雨下边坡失稳的预测方法。(1)降雨对土强度的影响机理通过研究孔隙水对非饱和土强度的影响，探讨了降雨对土强度影响的机理。提出了描述土壤中毛细水作用的几种模型，并通过数值分析讨论了孔隙水体积变化与土的抗剪强度之间的关系。(2)通过数值分析，研究了暴雨过程中地下水的渗流规律，了解了降雨过程中和降雨后地下水含水量随时间的变化过程。(3)吸力的现场测量土壤吸力的监测方法已经开发，以掌握在降雨期间和降雨后土壤强度条件的变化。(4)边坡失稳的数值分析通过数值模拟，研究了降雨过程中及降雨后边坡稳定性的变化。以降雨强度、土体性质和边坡形状为参数，模拟降雨与边坡稳定性的关系，验证了吸力测量作为边坡稳定性监测方法的有效性。