武隆鸡尾山滑坡滑带软岩流变试验研究  

Experimental study on the rheology of soft rocks in the slip zone of Jiweishan rockslide

作　　者：邓茂林[1] 许强[1] 韩蓓[1] 朱星[1] 

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

出　　处：《工程勘察》2013年第7期7-11,17,共6页Geotechnical Investigation & Surveying

基　　金：国家重点基础研究发展计划课题(2008CB425801);教育部创新团队发展计划(IRT0812);中国地质调查局项目(1212011014031)

摘　　要：滑带软岩的流变力学特性是影响大型岩质滑坡坡体稳定性的重要因素,而流变长期强度是评价大型岩质滑坡坡体长期稳定性的重要指标。采用岩石直剪流变仪对重庆武隆鸡尾山滑坡滑带条纹状含钙质灰质板岩进行了岩石的剪切流变试验。根据流变试验结果,得出滑带板岩的剪应力—剪切位移时程曲线,得出了岩石的长期强度参数。结果表明:将直剪流变试验与快剪试验获得的抗剪强度参数进行比较,发现前者获得的长期抗剪强度参数有显著降低,长期强度明显降低,摩擦系数降低31.53%,凝聚力降低37.61%,且凝聚力对剪切流变特性的影响高于摩擦系数。Some important factors which are rheological mechanical properties of slip zone with soft rocks affect the stability of the large-scale rock landslide slope, and the rheological long-term strength is an important index used to evaluate the long-term stability of the large-scale rock landslide slope. The shear rheologieal tests are carried out for the striped calcareous gray-matter slate in the slip zone of Wulong Jiweishan rockslide with soft rocks in Chongqing, and the direct shear theological apparatus is employed to fulfill the tests. According to the theological test results, time domain related shear stress-shear displacement curves of the slip zone slate and the long-term strength parameters of the rocks are obtained. The results show that： the long-term shear strength parameters arc significantly decreased compared to those given from the rapid shear tests, the long-term strength significantly decreased. The friction coefficient reduces by 31.53% , the cohesion reduces by 37.61% , and the rock cohesion is more effective than the internal friction coefficient to affect the shear rheological behaviors.

关 键 词：剪切流变试验 等时曲线 长期强度 条纹状含钙质灰质板岩 

分 类 号：TU458[建筑科学—岩土工程]