基于离心模型试验的武隆鸡尾山滑坡形成机制研究  

Study on the formation mechanism of Jiweishan landslide in Wulong,Chongqing,China-based on centrifugal model test

作　　者：邓茂林[1,2,3] 许强[1] 郑光[1] 董秀军[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 [2]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [3]三峡大学湖北长江三峡滑坡国家野外科学观测研究站,湖北宜昌443002

出　　处：《岩石力学与工程学报》2016年第A01期3024-3035,共12页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家杰出青年科学基金项目(41225011);国家重点基础研究发展计划(973)项目(2013CB733200);国家青年科学基金资助项目(41502291)~~

摘　　要：采用离心模型试验,查明和重现典型视倾向滑移型滑坡武隆鸡尾山滑坡的形成演化过程。试验模型采用重晶石粉、石英砂、石膏、甘油、水泥和水按一定比例,分别制作包含鸡尾山滑坡模型的基座、岩溶带和滑体的地质力学模型,布设相关仪器设备,按照相关规范运行离心试验。试验成果表明,武隆鸡尾山滑坡前部岩溶带的"易压缩性"为滑源区的蠕滑提供了"准临空面"作用,第二破裂面的形成是武隆鸡尾山滑坡失稳的前提,离心模型试验重现了武隆鸡尾山滑坡"蠕滑→拉裂→压缩(压碎)→剪切滑出"的致灾机制。结果表明,岩溶带"易压缩性"是坡体演化的关键条件之一,土工离心模型试验是一种研究岩质滑坡的有效方法。The formation and evolution process of Jiweishan landslide in Wulong as for typical apparent dip slid landslide was studied by using the centrifuge modeling test. The test model with the relevant instruments and equipment which includes the base, karst zone and the sliding body of the geomechanical model were made by barite powder, quartz sand, gypsum, glycerin, cement and water in certain proportion, and then the centrifugal test was operated according to the relevant rules. The test results show that the front karst zone＂ easy compression＂ provide the ＂quasi free surface＂ effect for the slope creep, and lead to the ＂soft base effects＂ failure mode. The premise of the landslide instability is forming the second fracture face, which reproduce ＂creep-crack-compressive （crushing）-shear＂ the disaster-causing mechanism of Jiweishan landslide. It turned out that the karst zone ＂easy compression＂ is one of the key conditions for the evolution of the slope, and also the centrifuge modeling test is an effective method to study rock landslide.

关 键 词：边坡工程 离心模型试验 易压缩带 软基效应 准临空面 形成机制 

分 类 号：P642[天文地球—工程地质学]