单拱大跨浅埋暗挖车站塌方原因分析及治理

Analysis of collapse causes of a single arched,large-span and shallow buried metro station and its treatment

以单拱大跨浅埋暗挖车站塌方事故为背景,运用有限元软件Midas-GTS进行数值模拟,通过计算结果与现场监测数据的对比,分析塌方原因。本着"先整体、后局部,抓重点、保通道,勤监测、重补漏"的思路,从车站整体加固、塌腔区处理、车站与施工通道接口段加固等方面入手,结合监控量测数据进行塌方治理,有效地控制了变形,避免了次生灾害及二次塌方事故的发生,确保了车站施工安全及周边建(构)筑物的正常使用功能。

Under the background of the collapse of single-arched long-span station, in which the NATM method was applied, the paper conducts numerical simulation with the help of finite-element software, namely Midas-GTS, and analyzes the reasons behind the collapse by comparing the calculation results with the in-field data. It carries out the principle of ＂keeping in mind the whole picture, as well as the partial pieces ,focusing on the key issues to save the passage way, remaining diligent in monitoring the situation to detect any defect＂ and it starts from the reinforcement of the station, cavity treatment and the interface reinforcement of the passage way at the station and the construction. The paper suggests to treating the collapse with the help of the monitoring measurement data and effectively takes the deformation under control, therefore avoid the secondary hazard and collapse and ensure the construction safety and the smooth operation of the buildings around.