开采过程中上覆急倾斜岩层运移规律模拟与研究

Study and simulation of overburden strata migration law of steep inclined strata in mining process

为了解开采过程中,急倾斜且具有水平裂隙发育的上覆岩层运移规律和特点,使用PFC3D软件建立该条件下的岩层模型,并进行了开采过程模拟。利用PFC3D中的JSET和Bonds模拟了非连续和连续性的岩体构造形式。模拟结果表明:上覆关键层下部始终不出现拉力,而是沿着急倾斜构造面产生裂隙,同时在开采面附近上覆成层岩体构造面存在较大的剪切错动,但整体仍然稳定。对开采过程产生的岩体最大颗粒位移量和地表最大沉降量进行定量分析,分别得到了这两个变量与走向方向推进长度的多项式函数关系。定量分析也证明了与模拟过程分析类似的结果。

To understand the migration law of steep inclined strata with the horizontal fracture,the model of steep inclined strata with the horizontal fracture was established using PFC3 D,and the mining process was simulated in this study.The discontinuity and continuity of rock mass structure forms were simulated with the JSET and Bonds in PFC3 D.The simulation results show that the tensile stress do not always appear in the lower of overlying key layer,but along the steep structural surface crack.At the same time,near the mining face,large shear dislocations exist at overlying rock mass structural surface,but the model is still stable.The maximum displacement of rock particles and the maximum ground settlement are quantitatively analyzed in the mining process. The polynomial function between these two variables and the advancing length in the advanced direction are obtained.Quantitative analysis also proves the results of simulation analysis.