滑坡体基质吸力的观测试验及变化特征分析  

EXPERIMENT AND ANALYSIS OF SUCTION OF UNSATURATED SOIL IN SLOPE

作　　者：汤明高[1] 许强[1] 黄润秋[1] 戚国庆[1] 

机构地区：[1]成都理工大学地质灾害防治与工程地质环境保护国家专业实验室,四川成都610059

出　　处：《岩石力学与工程学报》2006年第2期355-362,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：霍英东高校青年教师基金(91020);高等学校优秀青年教师教学科研奖励计划资助项目

摘　　要：降雨是影响滑坡稳定性的主要因素之一,在一个降雨周期内,滑坡体会呈干湿循环变化,坡体的基质吸力和暂态孔隙水压力会随着降雨过程和时间呈现不同的变化趋势。为研究这一复杂的变化趋势和规律,在三峡库区泄滩滑坡体上建立一个深为20 m的观测井,对滑坡体基质吸力、孔隙水压力和滑坡区降雨量进行长达2 a的观测研究,取得大量的第一手监测数据,分析总结了滑坡体基质吸力、孔隙水压力随时间、空间及降雨的变化规律。这一研究成果为进一步分析降雨对滑坡的影响程度提供了真实而科学的依据。Rainfall is known as the main unsaturated soil mechanics, a new way is factor which affects the stability of slope. With the development of coming to solve how suction and temporary water pressure affect the stability of slope. During the period of rainfall, water in the slope will change, at the same time the suction and the temporary water pressure will also change with time and rainfall. In order to know the characteristics of the change, the experiments to observe the change of suction and temporary water pressure are conducted. An observation well is built on the Xietan slope of the Three Gorges of the Yangtze River in May 2002. The well has a depth of twenty meters and a diameter of two meters. It is the largest well of observation on suction in the world. The well is put into action： and the data of the suction, temporary water pressure and rainfall is observed in October 2002. The work of observation is finished by the end of 2004. At last, by analyzing a large number of data and records, the character and change feature of the suction and temporary water pressure are found. The conclusions that the distribution of suction is decided by the materials and structure of slope are proved. The change of suction is related to the factors such as rainfall, time, depth, season and so on. The suction doesn＇t change promptly after the rain; there is time difference between the suction change and rainfall. It is obvious that these conclusions will guide to make further studies on how rainfall affect slope stability.

关 键 词：边坡工程 基质吸力 暂态饱和水压力 降雨周期 有效应力原理 

分 类 号：P642.22[天文地球—工程地质学]