拖担水库大坝左岸滑坡形成机制与治理措施  

Study On the Formation Mechanism and Treatment Plan of the Landslide on the Left Bank of Tuodan Reservoir Dam

作　　者：王玉川 刘许超 郭其峰 周延国 WANG Yu-chuan;LIU Xu-chao;GUO Qi-feng;ZHOU Yan-guo(Yellow River Engineering Consulting Co.,Ltd.,Henan Zhengzhou 450003,China)

机构地区：[1]黄河勘测规划设计研究院有限公司,河南郑州450003

出　　处：《防灾减灾学报》2021年第4期16-22,共7页Journal of Disaster Prevention And Reduction

摘　　要：拖担水库大坝左岸为一古滑坡,在水库扩建开挖过程中,诱发古滑坡体复活。在分析了滑坡工程地质特征的基础上,研究了其形成机制,通过反演计算,确定了底滑面的力学参数,提出了抗滑桩、开挖和挖锚结合三种处置方案,其中挖锚结合方案又分别对比了滑坡体上部开挖至2035.0m高程+下部锚固和滑坡体上部开挖至2015.0m高程+下部锚固两种方案。研究结果表明:古滑坡体为一基岩顺层滑坡,滑动模式为“滑移(弯曲)—剪断”型,左岸古滑坡体由于施工扰动,沿坡体内部软弱层面产生二次滑动;结合大坝工程设计,经技术经济比较,确定左岸滑坡体采取开挖治理措施。The left bank slope of Tuodan reservoir dam is an ancient landslide.During the reservoir expansion and excavation,the ancient landslide body was revived.Based on the analysis of the engineering geological characteristics of the landslide,the formation mechanism was studied.After inverse calculation,the mechanical parameters of the slipping surface were defined.Three treatment schemes were proposed including anti-slide pile,excavation scheme and anchoring-excavation scheme,of which the anchoringexcavation scheme compared two alternatives:excavating the upper deformation body to elevation of 2035.0m+lower anchoring,and excavating the upper deformation body to elevation of 2015.0m+lower anchoring.Research showed that the ancient landslide body is a bedrock bedding landslide,the sliding mode is“slip(bending)-shear”,and the sliding on the left bank occurred second time along its weak layer inside the ancient landslide body due to construction disturbance.Combined with dam engineering design as well as technical and economic comparison,it is recommended to take excavation treatment measure for the left bank landslide.

关 键 词：古滑坡 顺层滑坡 滑移(弯曲)—剪断 形成机制 治理方案 

分 类 号：P315.9[天文地球—地震学] P642.22[天文地球—固体地球物理学]