石灰岩地层盾构掘进中地面塌陷成因及预防措施研究

Analysis of Causes of Ground Collapse during TBM Excavation in Limestone Formation and Its Preventive Measures

针对吉隆坡石灰岩地层地铁区间隧道掘进过程中多次出现的地面塌方现象,文章通过对隧道监控量测数据进行分析,发现地面塌陷前多数监测断面数据显示稳定,未起到预测预判的作用。基于此文章系统介绍了高密度电法在溶洞探测方面的应用情况,提出隧道开始掘进前应提前采用地质物探技术,对溶洞进行识别探测,并进行注浆加固处理,避免出现地面塌方事故。该探测方法在另一区间隧道掘进过程中得到了有效验证。

In the process of TBM excavation of the Kuala Lumpur metro tunnel which is located in the limestone,the ground collapse phenomenon were frequently observed.Based on the analysis of the monitoring data of the Kuala Lumpur subway tunnel,it shows that before the ground collapse,most of the monitoring section data were normal and so did not play a role in forecasting and predicting.Therefore,this paper systematically introduces the application of high-density electrical method in Karst cave detection,and suggests that before the tunnel excavation,the geological geophysical technology should be adopted in advance to identify and detect the cave condition,and grouting reinforcement treatment should be carried out to prevent ground collapse accidents.This method has been verified in the excavation process of another running tunnel.