许信高速某标段滑坡的形成机理及稳定性数值分析  

Formation Mechanism and Numerical Analysis of Landslide Stability in a Section of Xuxin Expressway

作　　者：晁玉卓 余博源 CHAO Yuzhuo;YU Boyuan(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou,He′nan 450046,China)

机构地区：[1]华北水利水电大学地球科学与工程学院,河南郑州450046

出　　处：《水利与建筑工程学报》2024年第2期142-148,共7页Journal of Water Resources and Architectural Engineering

摘　　要：许信高速公路某标段深挖路堑东侧斜坡坡体出现裂缝,为保障高速公路的正常施工和安全运行,在对滑坡进行现场考察和工程地质勘察的基础上,详细分析滑坡变形的破坏与形成机理。利用FLAC^(3D)对滑坡稳定性进行数值模拟计算,并通过强度折减法,对不同工况时的滑坡稳定性进行数值分析。结果表明:滑坡目前处于蠕变阶段,处于不稳定状态;在暴雨的激发下将加剧滑坡的变形速度;在地震作用下滑坡处于失稳状态。滑坡属于前缘失去支撑及压重而产生的牵引式滑坡,建议采用抗滑桩、卸载和护坡等综合防治方案以保证坡体的稳定。There were cracks on the eastern slope of a deep cut in a section of Xuxin Expressway which has been increasing gradually.In order to ensure the normal construction of the expressway and the safety of the construction personnel,the deformation,failure and formation mechanism of the landslide are analyzed in detail on the basis of site investigation and engineering geological investigation.The landslide stability was numerically simulated by FLAG30,and the landslide stability under different working conditions was analyzed by strength reduction method.The results show that the landslide is in the creep stage and in an unstable state.Under the excitation of heavy rain,the deformation speed of landslide will be intensified.The landslide is in a state of instability under the action of earthquake.Landslide belongs to the tractive landslide caused by the loss of support and compression of the front.Comprehensive prevention and control schemes such as anti-slide pile,unloading and slope protection are suggested.

关 键 词：高速公路 滑坡 滑坡形成机理 数值模拟 稳定性分析 强度折减法 

分 类 号：P642.22[天文地球—工程地质学]