贵州山区软基型弃渣场失稳机理探究  

Study on Landslide Mechanism of Spoil Ground with Weak Foundation in Guizhou Mountain Area

作　　者：李蔚霖 LI Weilin(Guizhou Transportation Planning Survey&Design Academe Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《交通科技》2024年第5期62-65,共4页Transportation Science & Technology

摘　　要：贵州山区具有复杂的地质环境,弃渣场滑坡灾害屡见不鲜,文中依托贵州某高速公路YK9+180-YK9+480填方路基右侧B冲沟临时弃渣场遭遇连续强降雨后滑坡,通过现场地质调查、工程地质分析和构建地质模型开展数值模拟,分析该弃渣场滑坡机理。结果表明,弃渣场上覆较厚粉质黏土层,未清理便进行弃渣,由于沟谷排水不畅、汇水严重,降雨后粉质黏土基层及坡脚隆丘受浸泡形成软基,无法承受来自上部弃渣不合理堆填形成的巨大下滑力,受剪破坏形成灾害性滑坡;下部滑面为受强风化灰岩面控制的直线形滑面,中上部滑面为受均质弃渣体控制的圆弧形滑面。The mountainous areas of Guizhou have complex geological environments,and landslides in waste disposal sites are not uncommon.Based on the landslide of a temporary waste disposal site on the right side of the filling roadbed of a highway in Guizhou Province after continuous heavy rainfall,through on-site geological investigation,engineering geological analysis,and the construction of a geological model,numerical simulations were carried out to analyze the landslide mechanism of the waste disposal site.The results showed that the waste disposal site was covered with a thick layer of silty clay,and the waste was disposed of without cleaning.As a result of poor drainage and severe water collection in the valley,the silty clay base and slope foot hills were soaked after rainfall,forming a soft foundation that could not withstand the huge sliding force caused by the unreasonable filling of the upper waste,resulting in catastrophic landslides due to shear damage.The lower sliding surface was a linear sliding surface controlled by the strongly weathered limestone surface,while the middle and upper sliding surfaces were arc-shaped sliding surfaces controlled by homogeneous waste material.

关 键 词：软基型弃渣场 滑坡破坏 数值模拟 失稳机理 

分 类 号：U416.1[交通运输工程—道路与铁道工程]