1930煤矿河道下开采地表沉陷预计分析

Prediction and analysis of surface subsidence in mining under river in 1930 Coal Mine

为分析新疆焦煤集团1930煤矿河道下工作面采后的地表变形,采用概率积分法进行研究。根据概率积分法的计算模型和参数选取原则,确定了工作面采后预计参数。将预计结果进行数据化处理,经过分析可知,矿井开采后,达到充分采动后,地表上方将会产生一定程度的下沉盆地,最大下沉量达到5.5 m,在雨季地表下沉盆地会积聚雨水,会给矿井防治水工作造成一定的影响,应引起高度重视;在开采区域的地表上方会产生一定范围的拉伸和压缩区域,压缩区域会使表土层更加致密,阻止地表水向下渗透。而拉伸区域会造成地表裂缝,并延深到一定的深度,增加了地表水及第四系含水层的水向下渗透,与导水裂隙带形成水力通道;河道处的最大下沉值为5 400 mm,最大水平变形值绝对值为19 mm/m,最大倾斜值为51 mm/m,最大曲率值绝对值为0.6×10^-3/m。

In order to analyze the surface deformation of the working face underground river in 1930 Mine of Xinjiang Coking Coal Group, the probabilistic integral method was used in this paper. According to the calculation model of probability integral method and the principle of parameter selection, the predicted parameters of working face after mining were determined. Data processing of the predicted results showed that after mining, a certain degree of subsidence basin occurs above the surface after fully mining, with the maximum subsidence of 5.5 m. Rainwater accumulates in the surface subsidence basin during rainy season, with a certain impact on mine water prevention and control work, and should be highly valued. In the tension and compression regions, the compression regions makes the surface soil more dense and prevent the surface water from penetrating downward. The stretching area causes surface cracks and extends to a certain depth, increasing the downward seepage of surface water and Quaternary aquifer, forming a hydraulic channel with the water conducting fracture zone, the maximum subsidence value is 5 400 mm, the maximum inclination value 51 mm/m, the maximum curvature value 0.6 ×10^-3/m, and the maximum horizontal deformation value 19 mm/m.