云南腾冲地区粘土质硅藻土公路滑坡形成机理与防治优化设计  

The optimization design of the research on the formation mechanism,prevention and control of landslide along clayey diatomite highway in Tengchong,Yunnan Pzovince

作　　者：郭长宝[1] 周能娟[1] 付晓晓[1] 张永双[1] 张瑞端[1] 

机构地区：[1]中国地质科学院地质力学研究所/国土资源部新构造运动与地质灾害重点实验室,北京100081

出　　处：《地质通报》2013年第12期2021-2030,共10页Geological Bulletin of China

基　　金：国家科技支撑计划项目课题(编号:2012BAK10B02;2011BAK12B09);中国地质科学院地质力学研究所基本科研业务费项目(编号:DZLXJK201206);铁道部科技研究开发计划项目(编号:2008G027-B)

摘　　要：腾冲地区分布的粘土质硅藻土是一种特殊性的岩土体,具有孔隙大、密度低、含水量高,富含膨胀性粘土矿物、结构性强等特点。近年来已发生一系列与粘土质硅藻土相关的滑坡等地质灾害,造成了较大损失。在粘土质硅藻土工程地质特性测试分析的基础上,对腾冲地区粘土质硅藻土滑坡的分布特征和形成机理进行了研究,认为粘土质硅藻土滑坡以中小型滑坡为主,受公路切坡、采矿、降雨等因素影响较大;公路边坡滑坡多发生在坡体的中部和后部,在牵引作用下部分滑坡可发生大范围滑动。粘土质硅藻土具有膨胀性和极强的结构性,其边坡稳定性较差。以新修建腾泸公路边坡滑坡为例,对S238省道冯家大山滑坡的形成机理进行了探讨,认为受粘土质硅藻土膨胀性、结构性等的影响,人类工程扰动、降雨等引起边坡表部土体出现强度分层、膨胀性增强和力学强度降低,从而导致原支护结构破坏;在此基础上,对冯家大山边坡进行了优化设计和数值模拟分析,提出了综合防治建议。The clayey diatomite in Tengchong is a special kind of rock soil mass, characterized by rich swelling clay minerals, high porosity, low density, high water absorption capacity and strong structural properties. Along with the fast pace of engineering construction, there exist a series of geological hazards including landslides in clayey diatomite area. Based on analyzing the engineering properties of clayey diatomite, the authors took the clayey diatomite as the research object to study its distribution and formation mechanism. The results indicate that clayey diatomite landslides affected by such factors as road dissection, mining and rain are mainly of medium and small scale. The clayey diatomite slope landslides usually occur in the middle and rear part of the slope. Because of its swelling and strong structural properties, the clayey diatomite slope stability is relatively poor. With the landslides along the new Teng-Lu Highway as an example, the authors studied its formation mechanism. The result shows that the soil on the surface of the slope can be divided into several layers by intensity, and the swelling increases while the mechanical intensity is reduced. Some suggestions are also put forward based on numerical simulation analysis and optimal design performed on the slope of the Fengjia Mountain.

关 键 词：腾冲地区 粘土质硅藻土 地质灾害 防治优化设计 

分 类 号：P642.22[天文地球—工程地质学] P694[天文地球—地质矿产勘探]