大骨山滑坡病害成因分析及工程防治对策  

ANALYSIS OF CAUSES FOR DAGUSHAN LANDSLIDE AND ITS ENGINEERING COUNTER MEASURES

作　　者：程建军[1] 廖小平[1] 伍开江[2] 

机构地区：[1]中国铁道科学研究院,北京100081 [2]塔里木油田公司油气生产技术部,库尔勒841000

出　　处：《工程地质学报》2007年第5期667-672,共6页Journal of Engineering Geology

摘　　要：大骨山滑坡病害位于福建泉三高速公路YK128+630m～YK129+050m路段,病害区为凹形坡地,地层上部为第四系冲洪积层,下部为残积层及基岩风化带。依据现有地形地貌特征及钻孔揭露岩芯可判断该处为一古滑坡。斜坡上部隧道洞门施工致使坡顶开裂、洞口顶部坍塌。由于斜坡中下部下伏基岩的弱透水性,在降雨及病害区地表水的作用下,在岩土层地质界面处易形成软弱带,致使古滑坡有复活的迹象,古滑坡的复活将造成斜坡上部牵引破坏,并最终危及斜坡上部隧道洞口的稳定,为确保隧道洞口及斜坡中下部在建的林畔坑大桥的稳定与安全,采用Morgenstern-Price极限平衡分析方法,对斜坡分级进行稳定性分析计算,依据计算结果对滑坡病害进行针对性治理,在古滑坡中下部布置了锚索抗滑桩,为防止桥身墩位发生变形,在桥墩山侧布置锚索护桩。同时为消除地表水及降雨入渗对滑坡病害的影响,有针对性的在坡周及坡脚进行了截水与引水工程防治。Dugushan landslide situated on the YK128 ＋ 630m - YK129 ＋ 050m of the Quan - San expressway. The landslide located in a concave area, where the upper of stratum is quaternary deposit and the lower is weathered residual stratum. Base on the existing terrain and landform, also the drilling core, the existence of ancient landslide is deduced in this paper. Collapse in top area of the Dagushan Tunnel is due to the engineering construction. Under the influence of rainfall and surface water in slide area, the ancient landslide which lie in the middle and lower part of the slope could be re - activated, and it can be ascribed to the weak permeability of bedrock. In order to guarantee the stability and safe of tunnel entrance and the Lin - pan - keng bridge, the Morgenstern - Price method is adopted for the calculation and analysis. Based on the result of calculation along a section of the slope, the landslide treatment is proposed. Anchored anti -slide piles have been arranged in the middle and lower parts of the landslide. In order to prevent the deformation of the bridge pier, anchored piles have been arranged in front of the bridge pier. Also the engineering counter measures to rainfall and surface water are adopted to stabilize the landslide.

关 键 词：滑坡病害 防治对策 大骨山 林畔坑大桥 

分 类 号：P642.22[天文地球—工程地质学]