汉源二蛮山高速滑坡启程阶段孔隙水压力效应分析  

EFFECT OF PORE WATER PRESSURE ON SET-OUT RANGE OF HIGH SPEED LANDSLIDE OF ERMANSHAN IN HANYUAN CITY

作　　者：牛彦博[1] 胡卸文[1,2] 罗刚[1] 顾成壮[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,成都610031 [2]西南交通大学抗震工程技术四川省重点实验室,成都610031

出　　处：《工程地质学报》2013年第1期69-75,共7页Journal of Engineering Geology

基　　金：国家自然科学基金资助项目(40972175);NSFC-云南联合基金重点项目(U1033601);中央高校基本科研业务费专项资金(SWJ-TU11ZT14)资助

摘　　要：高速滑坡在启程滑动时锁固端突然剪断,剪应力释放导致滑带附近孔隙水压力突然增大,从而大大降低了有效应力,使滑坡具有很高的初始速度。以二蛮山滑坡为例,采取现场调查、室内试验与理论研究相结合的方法展开工作,分析了滑带土粒子破碎程度对孔隙水压力的影响,给出了滑坡启动时产生高孔隙水压力的条件;在理论研究的基础上,通过实地勘察,验证了二蛮山滑坡具备产生高孔隙水压力的条件。运用土力学和材料力学理论,导出了高速滑坡启程阶段孔隙水压力表达式,计算了二蛮山滑坡启程阶段的孔隙水压力,进一步研究了滑坡启程阶段的孔隙水压力效应。Because the lock segment can suddenly snip during the process of high speed landshde m the set-out range, the shearing stress is also suddenly released, which can make the pore water pressure near the sliding zone sharply increase. Therefore it greatly reduces the effective stress and makes the landslide has a very high initial ve- locity. Taking the Ermanshan landslide as example, this paper employs the field survey, laboratory test and theoret- ical research methods to study such mechanism. The pore water pressure can be affected by the degree of crushing of slip soil particles, which is analyzed. The condition of producing high pore water pressure when landslide starting is given. On the foundation of theoretical research, it shows that the landslide at Ermanshan site has the condition of producing the high pore water pressure through the exploration. By applying the theory of soil mechanics and the results of mechanics of materials, it can conclude the formula of the pore water pressure in the starting-up of the high speed landslide, and the pore water pressure of Ermanshan landslide are computed by this formula. Further- more it can deeply investigate the pore water pressure effect in the starting-up of the landslide.

关 键 词：高速滑坡 启程 滑带土颗粒 孔隙水压力效应 

分 类 号：P642.22[天文地球—工程地质学]