某特殊坡型路堑边坡失稳变形机制分析和治理设计

Instability and Deformation Mechanism Analysis and Treatment Design of a Special Shaped Cutting Slope

广州市某特殊坡型路堑边坡开挖和治理过程中经历了两次失稳变形,主要原因为折角形边坡开挖松弛效应明显,易产生次生软弱结构面,如削坡不充分,残留滑面易与坡体不利结构面贯通,引起滑坡复活。结合滑坡形态调查和勘察、监测手段,确定了滑面和抗剪强度。采用削坡减载和锚杆框格梁治理滑坡,效果良好,可为相关工程设计提供借鉴。

During the excavation and treatment process of a special slope type road cut slope in Guangzhou,there were two instances of instability and deformation.The main reason is that the relaxation effect of the excavation of the angular slope is obvious,which is easy to produce secondary weak structural plane.For example,if the slope is not fully cut,the residual sliding surface can easily connect with the unstable structural planes of the slope,leading to the revival of the landslide.The sliding surface and shear strength are determined by means of landslide morphology investigation and monitoring.The use of slope cutting,load reduction and anchor frame lattice beam to control landslide has a good effect,which can provide reference for related engineering design.