膨胀土路堑边坡的滑坡机理分析  

Mechanical Analysis of Cut Slope Failures in Expansive Soil Areas

作　　者：黄润秋[1] 吴礼舟[1] 胡瑞林[2] 

机构地区：[1]成都理工大学地质灾害防治国家重点实验室,610059 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质学报》2007年第11期1578-1583,共6页Acta Geologica Sinica

基　　金：国家自然科学基金重点项目"中国西南特殊地质环境条件形成机理及工程适宜性研究"(编号90102002)资助的成果。

摘　　要：膨胀土作为一种特殊土,其路堑边坡开挖之后若不及时防护易出现小规模的浅层滑坡;这类滑坡呈圈椅状体,后缘多出现在坡腰及其附近。为了研究膨胀土路堑边坡的滑坡机理,本文采用数值方法研究了这类边坡浅表风化层、裂隙性及时间效应对滑坡机理及稳定性的影响。研究表明:强度分层、裂隙的存在和蠕变效应共同决定了膨胀土路堑边坡的失稳具有浅层、小规模、渐进性和滑坡后缘通常出现在坡体中部的特点。工程实例和监测结果表明:锚杆框架梁可以有效抑止膨胀土边坡裂隙的扩展和发展,阻止坡体的变形,是这类边坡一种有效的加固方式,值得推广。As a special type of soil, expansive soil can be found in almost all countries. It is very easy to induce slips in superficial layers if the cut slopes have not been supported in time. The backscarp of the landslides, the scale of which is small, usually occurs in the middle of the slopes, and seldom happens at the top of the slopes. The toe is usually arcuate in shape. In order to research the forming mechanisms of superficial slides in expansive soil regions, FLACaD software is used to simulate the effects of cracks and fissures in superficial layers on the deformation of the slope. Meanwhile, a creep model of expansive soil slopes is analyzed. A case study and monitoring results indicate that anchor frame beams can restrain expanding of cracks and fissures, and effectivelv strentrtht^n th ttincr ~1 ; ; ：1

关 键 词：膨胀土 路堑边坡 FLAC^10 数值模拟 锚杆框架梁 

分 类 号：U416.14[交通运输工程—道路与铁道工程]