重复开采条件下不同工作面布置方式对开采沉陷的影响

The Impact of Different Panel Layout Methods on Mining Subsidence Under Repeated Mining Conditions

随着深部煤炭的开发,重复开采所引起的地表沉陷严重影响着矿区的生态地质环境。为了研究重复开采条件下,工作面布置方式对开采沉陷的影响,选取山西某煤矿为研究对象,结合研究区地质环境条件,采用MIDAS GTS/NX建立三维地质模型,进行数值模拟分析,对比采动过程中各模型地表下沉值及覆岩应力应变特征,分析不同工作面布置方式下地下开采空间转化为地表下沉的转化量,总结其对开采沉陷的影响规律。结果表明:工作面垂向平行布置相较于垂向垂直布置,开采沉陷引起的地表下沉值较小;重复开采过程中,一方面,工作面垂向平行布置形成的地下开采空间小于垂向垂直布置;另一方面,工作面垂向平行布置对“应力拱”的扰动小于垂向垂直布置。因此,工作面垂向平行布置时,可以有效减少地下开采空间转化为地表下沉,降低开采沉陷造成的影响,在工况允许的条件下,应尽量采用垂向工作面平行布置,以减轻重复开采引起的地表下沉。

With the development of deep coal mining,surface subsidence caused by repeated mining has significantly impacted the ecological and geological environment of mining areas.In order to study the impact of different panel layout methods on mining subsidence under repeated mining conditions,a coal mine in Shanxi Province was chosen as the research object.By combining the engineering geological conditions of the study area and using MIDAS GTS/NX for numerical simulation analysis,the surface subsidence values and overburden stress-strain characteristics of various 3Dgeological models during mining were compared.The conversion of underground mining space to surface subsidence under different panel layout methods was analyzed,and the impact pattern on mining subsidence was summarized.The results show that the vertical parallel panel layout causes smaller mining subsidence compared to the vertical perpendicular layout.During the repeated mining process,on one hand,the underground mining space formed by the vertical parallel panel layout is smaller than that of the vertical perpendicular layout;on the other hand,the disturbance to the“stress arch”caused by the vertical parallel panel layout is smaller.Therefore,when the panels are vertically parallel arranged,it can effectively reduce the conversion of underground mining space to surface subsidence and mitigate the impact of mining subsidence.Under the conditions allowed by the working conditions,the vertical parallel panel arrangement should be adopted as much as possible to reduce the surface subsidence caused by repeated mining.