深挖方膨胀土渠道变形破坏形式及成因探讨  

Deformation failure mode and genesis discussion for deep excavated expansive soil channel

作　　者：强鲁斌 朱瑛洁 曹道宁 李迷 马力刚 

机构地区：[1]长江岩土工程总公司(武汉),湖北武汉430010

出　　处：《人民长江》2014年第6期82-84,88,共4页Yangtze River

基　　金："十二五"国家科技支撑计划课题(2011BAB10B03)

摘　　要：深挖方膨胀土渠道在施工开挖过程中及渠坡基本成型后的一段时间内,时常出现渠坡变形破坏现象,影响到正常的工程施工及工程后期的安全运行。为了研究深挖方膨胀土渠道的变形破坏形式,以南水北调中线工程为例,从膨胀土性质、地质成因入手并结合开挖揭露的地质情况及渠坡变形的长期监测成果,对深挖方膨胀土渠道变形破坏形式进行了分析研究,总结出了失水干裂-吸水崩解、冲蚀雨淋沟、脱坡及土溜、滑坡等变形破坏形式,有针对性地提出了膨胀土渠道加固处理的措施建议。Channel slope deformation failures of deep excavated canal usually occur during construction and seriously threaten the construction and operation safety of the canal. For exploring the failure mode and genesis of channel slope of South-to-North Water Diversion Project, we analyze expansive soil characteristics and its geological genesis combing with the geological sit-uation revealed by excavation and long-term monitoring data. The failure modes can be classified as crack by water loss-disin-tegration by water absorption, gully by rain erosion, slope failure and slurry flows, slope landslide, and the treatment measures for channel slope failure are proposed accordingly.

关 键 词：膨胀土 深挖方 渠坡 破坏形式 南水北调中线工程 

分 类 号：P634[天文地球—地质矿产勘探]