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Seepage flow behavior in slopes due to water level change in the reservoir

水库水位变化引起的边坡渗流行为

基本信息

批准号：
10650493
负责人：
NARITA Kunitomo
金额：
$ 0.83万
依托单位：
Aichi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650493/
关键词：
Fill Dam Centrifuge Model Test Pore Water Pressure Rapid draw-down Slope stability Slope Stabilization FEM Analysis

项目摘要

Fill-type dams for power generation and irrigation purposes have often experienced severe damages of slope failure due to a rapid draw down of the reservoir water in seasons. This study concerns seepage flow behavior in earth slopes, development of the phreatic surface and distribution of pore water pressure in the dam body and their influence on slope instability, due to the change in the upstream water level in the reservoir. Centrifuge model tests and associated FEM saturated-unsaturated seepage analyses were carried out on several model earth fills to discuss and propose an appropriate procedure of stability evaluation of slopes.The concluding remarks are as follows : (1) The movement of the phreatic surface due to the change in the reservoir water level can roughly be estimated by the centrifuge model tests, and a close agreement was achieved between the behavior in the model tests and that evaluated by the FEM seepage analysis. (2) The development of residual pore-water pressure is really confirmed in model fills due to the rapid draw down of the reservoir water. The accumulation of the residual water pressure is comparatively high in the central part of the fill and its variation has a close correlation to the rate of draw down water level. (3) Stability of model earth fills is largely dependent on the water pressure of the reservoir water as well as the residual pore water pressure developed in the embankment. The overall stability of the fill along a deep sliding surface shows an abrupt decrease as the rate of water table change increases.

用于发电和灌溉的土石坝常因库水季节性快速下降而发生严重的边坡破坏。本文研究了水库上游水位变化对土坝边坡渗流特性、坝体浸润面发育和孔隙水压力分布的影响及其对边坡失稳的影响。通过对几个填土模型的土工模型试验和有限元饱和-非饱和渗流分析，探讨并提出了一种边坡稳定性评价的方法，其结论如下：（1）通过离心模型试验，可以粗略估计库水位变化引起的潜水面移动，模型试验结果与有限元渗流分析结果吻合较好。(2)由于水库水的快速下降，在模型填充中确实证实了残余孔隙水压力的发展。填土中部的余水压力积累较大，其变化与水位下降速率密切相关。(3)模型填土的稳定性在很大程度上取决于水库水的水压力以及路堤中形成的残余孔隙水压力。随着地下水位变化率的增加，沿沿着面填土的整体稳定性急剧下降。