苏州浒墅关阳山碎裂基岩滑坡的破坏机理研究

Study on the Failure Mechanism of Cataclastic Texture Rock Landslide in Xushuguan-Yangshan of Suzhou

苏州浒墅关阳山西侧边坡因开挖历史较长,形成了整体高差约260m的高陡边坡,严重威胁着坡下开发区居民及用地安全,尤其以其顶部的碎裂基岩滑坡危险性最大。本文从构造历史、岩性、外界营力等多个角度对该基岩滑坡的形成条件、稳定性影响因素、演变历史和破坏机理等进行了全面研究,认为该基岩滑坡的破坏模式为圆弧形滑动,其破坏机理主要受控于滑体前缘良好的临空面、作为软弱夹层的石英斑岩岩脉、因推覆构造而呈碎裂状的岩体结构等,并有针对性地提出了削坡加格构支挡的防治方案,从而有效地控制了该滑坡灾害的进一步发展。

The slope in the west of Xushuguan-Yangshan of Suzhou is a high and steep slope with the height difference of about 260m because of a long history of excavation. In particular, the fractured bedrock on the top is the most dangerous and surrounding people＇s safety is seriously threatened. This paper gives a comprehensive analysis of the formation conditions of bedrock landslide, the influence factors of stability,the evolution history and the failure mechanism from the perspectives of development history,lithology and external agents. Based on the analysis,conclusions can be drawn that the failure mechanism of this circular failure slope is mainly controlled by the free face in the front of landslide, the quartz porphyry dike which is a weak intercalation and the cataclastic rock structure formed by napped structure. The paper also puts forward a control plan of using slope cutting and lattice to support and retain the slope so that the disaster can be prevented effectively.