溜砂坡大规模失稳动力学机制试验研究  

EXPERIMENTAL RESEARCH ON DYNAMIC FAILURE MECHANISM OF LARGE-SCALE TALUS SLOPE

作　　者：张元才[1] 黄润秋[1] 傅荣华[1] 裴向军[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《岩石力学与工程学报》2010年第1期65-72,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：交通部西部交通科技项目(200431800003)

摘　　要：大量直剪试验结果表明,随着细颗粒含量的增加,散粒体抗剪强度不断降低。结合天山公路沿线溜砂坡的现场调查资料,在物理模拟试验基础上,证实细颗粒层在溜砂坡大规模失稳过程中所起到的控制性作用,进而构建一种由散粒层、细颗粒层和摩阻层所组成的溜砂坡3层散体结构模型,并提出一种具有整体错动特征的滑塌式大规模失稳模式。其失稳动力学机制为,在各种动荷载的强烈扰动下,由于细颗粒层物质抗剪强度相对较低,坡体沿细颗粒层发生类似滑坡的大规模滑塌。A large number of experimental results indicate that the content of the fine particles has fairly influence on the shear strength of granule. With the increase of the content of fine particles, granular shear strength gradually declines. Combined with in-situ investigation of the talus slope located in Tianshan highway and indoor physical simulation experiment results, it is found that fine granular layer plays controlling role in the large-scale failure process, and a three layers granular structural mode which is composed of loose granular layer, fine granular layer and frictional layer is proposed. Moreover, a new large-scale failure model, which takes on a whole failure characteristic is constructed. The kinetic mechanism of one slump is as follows： as a result of fine particle layer material, the shear strength is relatively low, the talus slope will accumulate large-scale slump along the fine particle layer, which is similar to the instability characteristics of landslide under the strong disturbance of various dynamic loads.

关 键 词：工程地质 溜砂坡 细颗粒层 整体错动特征 动力学机制 散体结构模型 大规模滑塌 

分 类 号：P642[天文地球—工程地质学]