贵阳轨道交通诚信路站基坑坍塌原因及处理措施研究

贵阳轨道交通1号线诚信路站地下工程施工时，基坑围护结构失稳变形:钻孔桩发生了转动、冠梁断裂、基坑边坡土体失衡坍塌，严重影响工程进展及安全。为此，采用桩间增设预应力锚索加固等综合措施，确保了基坑稳定，完成了地下主体工程。该处理方案合理、快捷，投入少、效果好，起到控制变形扩展、稳定边坡的双重作用。

Study on Reason and Treatment of the Foundation Pit Collapse in Chengxin Road Station in Guiyang Urban Rail Transit Project

During the construction of Chengxin Road Station of Line 1 of Guiyang Urban Rail Transit Project, it was found that the retaining structure of foundation pit is unstable and has deformation, including the rotation of drilling pile, the fracture in the top beam, the collapse and instability of foundation pit slope. It greatly affected the engineering process and safety. Hence, a comprehensive treatment applying additional pre-stressed anchor cable between piles was adopted to confirm the stabilization of foundation pit. With the completion of the main part of underground engineering, it is proved that the treatment is reasonable and fast with less investment but better effect in not only controlling deformation expansion but also stabilizing the slope.