Shaanxi Coal Group Xiaobaodang Mining Co., Ltd.

为研究毛乌素沙漠边缘与黄土高原过渡地区的厚松散积沙地表移动规律,结合陕北榆神矿区小保当二号煤矿132201综采工作面地质条件,基于实测数据进行分析总结,计算出地表下沉参数。对地表沉陷的概率积分公式进行参数拟合,得出地表移动启动距等参数,结果表明,132201综采工作面最大下沉速度为129.43mm/d,地表移动启动距为108.2m,地表总体移动时间为182d。对地表裂缝发育特征进行分析,判断裂缝主要分为垂直走向线、平行走向线和切眼附近3部分。以132201工作面地质参数建立模型,用FLAC3D数值模拟方法验证地表沉陷下沉参数的准确性。

In order to study the surface movement law of thick loose sand in the transition area between the edge of MaowusuDesert and the Loess Plateau, combined with the geological conditions of 132201 fully mechanized mining face of Xiaobaodang No. 2 Coal Mine in Yushen mining area in Northern Shaanxi, the surface subsidence parameters are calculated basedon the measured data. The parameters of the probability integral formula of surface subsidence are fitted, and the parameterssuch as the starting distance of surface movement are obtained. The results show that the maximum subsidence speed of132201 fully mechanized mining face is 129. 43 mm/ d, the starting distance of surface movement is 108. 2 m, the overallsurface movement time is 182 days. Based on the analysis of the development characteristics of surface fractures, it is judgedthat the fractures are mainly divided into three parts: vertical strike line, parallel strike line and near the cut hole. The modelis established based on the geological parameters of 132201 working face, and the accuracy of surface subsidence parametersis verified by FLAC3D numerical simulation method.