基于似单差法的井筒沉降监测试验与结果分析

为监测地下煤炭开采对某矿工业广场内主、副井筒的影响,布设了由54个监测点和2个基准点组成的监测网。监测网的基准时段测量采用静态GPS相对定位技术和三等几何水准,以此作为沉降监测基础;监测时段外业观测方法与基准时段的相同,但沉降量采用以似单差法为理论的GQuickS软件进行解算,并与几何水准测得的沉降量进行比对分析,结果表明,采用似单差法进行沉降监测可达到三等水准监测的要求。

Test of well subsidence monitoring and results analysis based on similar single-difference methodology

In order to monitor the deformation of the main and auxiliary wells in a mine industry square caused by underground coal mining,a monitoring network composed of 54 monitoring points and two datum points is established.The global positioning system(GPS) static relative positioning method and three-degree geometric leveling are adopted for the datum session measuring of the monitoring network,and the measuring results are used as subsidence monitoring datum.The observation method of monitoring session is the same as that of datum session,but the subsidence values are computed by GQuickS software based on the similar single-difference methodology(SSDM),and compared with that of geometric leveling.The results show that the SSDM based subsidence monitoring can be up to the monitoring requirement of three-degree leveling.