老旧采煤塌陷区动态监测及其稳定性初步分析

Dynamic Monitoring and Stability Prediction of Old Coal Mining Subsidence Area

采空塌陷严重影响了人民群众的生命财产安全,准确评价采空区的稳定性,提高预警的时效性,采空塌陷的实时监测至关重要。本文以北京市门头沟区王平镇南港村采空塌陷区为工程背景,建立了以GPS、静力水准、深部测斜、多通道微震监测为主的动态监测系统,实现了多源信息融合技术的采空塌陷区位移场、应力场的全天候监测。基于CAD-Surfer-ANSYS方法建立了采空区三维模型,实现了采空塌陷区监测体系的三维可视化管理,并在监测数据初步分析的基础上,采用数值模拟技术对采空塌陷区稳定性进行了初步分析,为采空塌陷灾害防治提供了技术支持。

The mining subsidence is the important factor to threaten the local people’s lives and properties. It is very important to monitor the subsidence for evaluating the stability and accurately predicting the occurrence time. Nangang Village mining subsidence area, Wangping Town, Mentougou District, Beijing, is taken as the engineering background study area in this paper. A three-dimension monitoring system based on GPS, static leveling inclinometer as well as microseism monitoring technique are established, which realizes the 24-hour monitoring of stress feld and displacement feld; then, a three-dimension geological model is established by means of CAD-Surfer-ANSYS, which realizes the visualization of monitoring system. Besides, the monitoring data and numerical simulation data are analyzed primary, which offer technique supports for prevention and control of mining subsidence.