俯斜和仰斜开采对地表沉降的影响

Effect of inclined and oblique mining on ground settlement

针对煤炭开采引起的沉降问题,以鸡西某矿的地质资料为背景,采用CAD建立模型,ANSYS划分网格,以其作出全面准确、科学合理的预测。基于有限元和离散元有机结合的计算软件CDEM模拟俯斜和仰斜两种不同的开采方式,进行开采沉降分析。结果表明:在单煤层且厚度不变的条件下,俯斜开采和仰斜开采结果相似。俯斜开采随着开采的进行,工作面由浅到深,地表移动和变形幅度逐渐减小,变形范围却增加。仰斜开采随着工作面的推进,采深逐渐减小,地表的移动和变形幅度相对增加,开采扰动的范围变小。俯斜开采地表沉降量平均位移为0.63 m,仰斜开采地表沉降量平均位移为0.58 m。

This paper is devoted to a comprehensive,accurate and scientific interpretation prediction of the settlement resulting from coal mining,using the geological data from a coal mine in Jixi as background,applying CAD to build model and using ANSYS to divide the grid. The study works towards mining simulation based on the calculation software CDEM-the organic combination of finite element and discrete element; and mining subsidence analysis using two different mining methods： inclined and oblique one in simulation. The results show that single coal seams accompanied by a unchanged thickness leads to similar results in inclined mining and oblique one; there is a gradually decreasing movement and deformation amplitude,but an increase in deformation range in the surface due to inclined changing from shallow to deep along with the workface of mining; there follows a gradually decreasing mining depth due to the mining depth of workface in oblique mining,coupled with the relative increase in surface movement and deformation amplitude,and consequent smaller mining disturbance range. The study shows the average displacement of 0. 63 m and 0. 58 m respectively in inclined mining surface subsidence and oblique mining surface subsidence.