山岭区高速公路古滑坡体失稳及工程治理研究  

Study on the Instability and Engineering Treatment of Ancient Landslide Mass of Expressway in Mountainous Area

作　　者：彭泽乾 彭川 PENG Zeqian;PENG Chuan(Construction Management Branch,Shaanxi Transportation Holding Group Co.,Ltd.,Xi'an Shaanxi 710075,China;Urban Development Research Center,Zhongshe Engineering Consulting(Chongqing)Co.,Chongqing 400025,China)

机构地区：[1]陕西交通控股集团有限公司建设管理分公司,陕西西安710075 [2]中设工程咨询(重庆)股份有限公司城市发展研究中心,重庆400025

出　　处：《安徽理工大学学报（自然科学版）》2022年第5期31-38,共8页Journal of Anhui University of Science and Technology:Natural Science

摘　　要：为有效治理高速公路DK0+170~DK0+326段右侧路堑边坡在开挖施工过程中发生的滑塌灾害,在补充勘察滑坡范围内工程地质条件、研究古滑坡体受扰失稳渐进性破坏机理的基础上,根据Janbu法利用GEO5边坡稳定模拟分析软件,针对正常、暴雨两种工况下对原坡面及不同开挖时步坡体稳定性进行模拟计算分析。结合现场滑坡实际情况,分析该处古滑坡体受扰失稳复活滑动成因,并采取抗滑桩处置措施对失稳边坡进行加固。分析结果表明,原坡面已经处于欠稳定状态,由于边坡开挖施工使坡体的中前部形成临空面,加之强降雨使土体自重增大、抗剪强度降低以致该处古滑坡体受扰失稳复活滑动;采取抗滑桩处置措施后,按不同桩长截面验算坡体稳定性均满足规范要求,边坡稳定性研究过程及结果可为类似工程提供借鉴。In order to effectively control the collapse disaster of the right cutting slope of section DK0+170DK0+326 of expressway during the excavation and construction,the stability of the original slope surface and the slope mass during different excavation was simulated and analyzed by the GEO5 slope stability simulation analysis software with the Janbu method under the normal and rainstorm conditions and based on the supplementary investigation of the engineering geological conditions within the landslide range and the study of the progressive failure mechanism of the disturbed instability of the ancient landslide mass.Combined with the actual situation of the landslide on site,the causes of the disturbed instability and reactivation sliding of the ancient landslide were analyzed and the anti slide pile treatment measures were taken to reinforce the unstable slope.The analysis results showed that the free surface formed in the middle and front of the slope due to the excavation of the slope resulted in the disturbed instability and reactivation of the ancient landslide mass at the unstable state of the original slope surface.at the condition of the heavy rainfall increasing the self weight of the soil mass and reducing the shear strength,while the slope stability calculated from different pile length sections met the specification requirements after the anti slide pile treatment measures were taken.The research and its results of slope stability can provide reference for similar projects.

关 键 词：古滑坡体 受扰失稳 复活滑动破坏 抗滑桩 滑坡治理 

分 类 号：U416.14[交通运输工程—道路与铁道工程]