辛置煤矿间歇开采岩移机理及沉陷规律研究

发布时间：2018-03-26 00:16

  本文选题：巨厚黄土层　切入点：间歇开采　出处：《地下空间与工程学报》2017年05期

【摘要】：为了研究巨厚黄土层下间歇开采岩移机理及地表沉陷规律,基于辛置煤矿的地质采矿条件,对条带开采煤柱的稳定性进行了理论分析,得到了倾斜煤层煤柱稳定性的判别函数;采用UDEC数值分析方法反演了百亩沟村庄下前期条带开采覆岩及地表沉陷特征,揭示了岩层移动的机理,获取了研究区域主断面的地表沉陷值。隔离煤柱回收后,依据现场实测数据,分析了间歇开采地表动态和静态地表沉陷特征,求取了地表移动角值参数和概率积分预计参数。研究结果表明,前期条带开采煤柱能够形成稳定的核区,煤柱安全系数为2.34,关键层不破断,地表最大下沉217 mm,最大水平拉伸变形为0.41 mm/m,小于窑洞的Ⅰ级抗拉伸水平变形的临界值。间隔煤柱回采后,地表移动初始期和活跃期偏短累计219 d,最大下沉点下沉量与下沉时间服从负指数函数关系;地表终态最大下沉1 537 mm,水平拉伸变形为3.98 mm/m,地表建(构)筑物所受的采动损坏程度超过了Ⅱ级。间歇开采后地表沉陷下沉系数为0.74,开采影响传播角系数为0.6。
[Abstract]:In order to study the mechanism of intermittent mining rock movement and the law of surface subsidence under the extremely thick loess layer, based on the geological and mining conditions of Xinji Coal Mine, the stability of strip open coal pillar is analyzed theoretically, and the discriminant function of stability of inclined coal seam pillar is obtained. In this paper, the characteristics of overburden and surface subsidence in the early stage strip mining of Baimu Gou village are inversed by using UDEC numerical analysis method. The mechanism of strata movement is revealed, and the surface subsidence value of the main section of the study area is obtained. Based on the field measured data, the dynamic and static surface subsidence characteristics of intermittent mining are analyzed, and the parameters of surface movement angle and probability integral prediction are obtained. The results show that the early stripe mining pillar can form a stable core area. The safety factor of coal pillar is 2.34, the key layer is unbroken, the maximum subsidence is 217 mm, the maximum horizontal tensile deformation is 0.41 mm / m, which is less than the critical value of grade I tensile horizontal deformation of cave. The initial and active periods of surface movement are short for 219 days, and the relationship between the maximum subsidence point and subsidence time is negative exponent function. The maximum final subsidence is 1 537 mm, the horizontal tensile deformation is 3.98 mm / m, and the mining damage degree of the ground building is higher than that of grade 鈪，

本文编号：1665497