寒区充填开采地表变形监测数据稳定性分析

Stability Analysis of Surface Deformation Monitoring Data of Backfill Mining in Cold Region

为了准确获取充填面地表移动变形数据,有必要对各期监测数据的质量进行检验。利用F检验和t检验方法对寒区充填面观测站中监测点进行稳定性分析,结果表明观测期间控制点具有稳定性,进一步分析发现目标点存在3种形式的竖向移动:一是采煤引起的地表沉降,二是长期的汽车荷载作用下路基沉降现象,三是季节性冻土层的融沉现象。最后一种现象在我国高纬度地区较为普遍,该现象的产生将扩大地表移动盆地边界,减小主要影响正切值,不利于该类地质采矿条件下地表移动变形预计参数的准确获取。

In order to accurately obtain filling mining surface deformation data,it is necessary to test the quality of monitoring data at each period. The results show that control points are stable during monitoring through F-test and t-test for the stability analysis of surface deformation monitoring data of filling in cold region. Then,further analysis indicates that there are three kinds of vertical movements： the first is the surface subsidence caused by mining; the second is roadbed subsidence under long-term car loads; the last one is thaw collapse of seasonal frozen soil. The last is more general in the high latitude regions of China,and this phenomenon will have some influence on the surface deformation monitoring data,which enlarges the surface movement boundary and reduces the main affecting tangent angle. It is not conducive for getting estimated parameter accurately for this kind of geological and mining conditions.