膨胀性土质边坡滑坡成因及综合整治措施研究  

Study on the Mechanism of Landslide on the Slope of Expansive Soil and Its Comprehensive Control Measures

作　　者：雷正敏 LEI Zhengmin(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2021年第7期134-137,172,共5页Railway Construction Technology

基　　金：中铁第五勘察设计院集团有限公司科研计划课题(T5Y2020-C01)。

摘　　要：在影响边坡稳定的众多因素中,水的存在和土体的亲水性对边坡的稳定起决定性作用。结合某铁路膨胀性土质工程滑坡的实例,开展了滑坡成因分析及综合整治措施研究。结果表明:对于含有亲水性矿物的土体,虽然按规范评定达不到膨胀土标准,但是对其膨胀性要有充分的认识,勘察设计时应考虑其胀缩性,避免雨水下渗、岩土体含水量增加、土体抗剪强度指标急剧降低引起工程滑坡。滑坡的整治应充分认识其变形特征、形成原因、发展趋势等,加强地表、地下水的引排,并采用抗滑桩、卸载反压等综合整治措施。Among the many factors that affect slope stability,water and soil hydrophilicity plays a decisive role on slope instability.In combination with the example of expansive soil slope engineering landslide in a railway project,this paper analyzes the reasons of landslide and comprehensive control measures.The results show that soil with hydrophilic minerals may be not meet the classification standard of expansive soil but we should fully consider its expansion and contraction,in order to prevent rainfall infiltration caused the increase of moisture content in soil and the sharp decrease of shear strength of the soil,resulting in the landslides.For the treatment of landslides,we should fully recognize the deformation characteristics,reasons,development trends,etc.,and strengthen the drainage of surface and groundwater.In addition,anti-slide pile structure,load reduction,back pressure,and other comprehensive control measures may be adopted.

关 键 词：膨胀性土 滑坡 降雨入渗 综合整治措施 

分 类 号：U216.419[交通运输工程—道路与铁道工程]