填方边坡变形机制研究  

Study on Deformation Mechanism of a Fill Slope

作　　者：徐聪[1] 胡新丽[1] 沙玉[2] 黄凯湘[1] 吴丹丹[1] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《安全与环境工程》2015年第1期39-44,共6页Safety and Environmental Engineering

基　　金：国家重点基础研究发展计划("973"计划)项目(2011CB710600);国家自然科学基金项目(41272305)

摘　　要：在对西南地区某800kV换流站填方边坡现场进行工程地质调查的基础上,通过对经过先期治理但仍发生变形的填方边坡的变形特征和监测数据进行分析,总结边坡稳定性影响因素,并结合FLAC3D数值模拟对边坡变形破坏机制进行了研究。结果表明:该填方边坡破坏模式为整体滑移破坏,导致边坡经过治理但仍发生变形的主要诱因是强降雨,但边坡的前期治理设计也存在不足;由于降雨导致边坡重度增大,底部强风化泥岩软化,填土抗剪强度降低,在边坡内形成贯通的滑动面,滑动面绕过加筋土挡土墙的加筋带,边坡顺着强风化层从软化的坡脚剪出;位移监测显示边坡处于加速变形阶段;边坡应急治理措施应重点放在控制边坡继续沿软弱面的滑移变形上,并加强坡体排水,该边坡变形控制的治理方案对同类工程的设计与应急治理具有一定的参考价值。Investigating the engineering geological condition of a fill slope of a 800kV Convertor Station,this paper analyzes the deformation features and monitoring data of the fill slope, which has been reinforced. By using FLAC3D numerical method,the paper also discusses the influence factor of the slope deformation and the deformation mechanism. The results show that the failure mode of the slope is sliding as a whole. Heavy rainfall is the main factor which causes the deformation of the fill slope and the previous design is inade- quate to some extent. Under the effect of rain,the density of the soil in the slope increases and the heavily weathered mud stone at the bottom becomes soft. The shear strength of the filled earth decreases obvious- ly. These changes make the sliding surface go around reinforced earth retaining wall and cut out from the soft slope toe along the weathered zone. Displacement monitoring indicates that the slope is in the accelerated deformation stage. The emergency control design should focus on restraining the deformation on the heavily weathered zone and enhance the drainage in the slope. This project provides a reference for the fu- ture engineering design.

关 键 词：填方边坡 变形机制 数值模拟 

分 类 号：X45[环境科学与工程—灾害防治] P642[天文地球—工程地质学]