大采深综放开采地表移动变形规律

(1.西安科技大学 能源学院,陕西 西安 710054; 2.西安科技大学 西部矿井开采及灾害防治教育部重点实验室,陕西 西安 710054)

矿业工程; 开采沉陷; 非充分采动; 概率积分法; 地表移动变形; 反演模拟

Surface movement and deformation law of fully-mechanized caving mining with large mining depth
YU Xue-yi1,2,WANG Zhao-shun1,2,YANG Yun1,2

(1.College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an 710054,China)

mining engineering; mining subsidence; inadequate mining; probabilistic integration method; surface movement and deformation; inversion simulation

DOI: 10.13800/j.cnki.xakjdxxb.2019.0401

备注

为研究在大采深综放工作面开采条件下地表移动变形规律,以陈家沟煤矿八采区8512,8513综放工作面地表移动观测数据为基础,分析在大采深综放工作面条件下开采一个工作面与开采两个工作面后的地表移动变形规律。另外,运用概率积分法建立模型,根据观测数据进行反演模拟修正预计参数,得出在该条件下的概率积分预计参数,并总结充分采动条件下地表移动变形规律。结果 表明:在大采深综放开采条件下,开采一个工作面时,地表属于极不充分采动,大采深极不充分采动地表移动变形一般较小,地表损害一般在Ⅰ级以内,开采后地表建筑物能够安全使用; 开采两个工作面后,地表属非充分采动,地表水平移动范围较常规开采条件下范围要大,且水平移动范围一般比下沉范围大; 预计在第四个工作面开采后地表达到充分采动。非充分采动条件下,下沉盆地呈非对称分布,最大下沉点不在采空区中心上方; 在达到充分采动条件时,最大下沉值处于采空区中心上方,从盆地中心至边缘下沉值逐渐减小趋于0; 拐点处的水平变形值与曲率值均为0.反演得出大采深综放工作面地表移动预计参数及地表移动角量参数,预计地表达到稳态时,地表最大下沉量为5 003 mm.此成果能够为该矿“三下开采”评价提供理论依据。

In order to study the law of surface movement and deformation under the condition of fully-mechanized top-coal caving face with large mining depth,this paper analyzed the surface movment and deformation with one working face and two working faces mined under the condition of fully-mechanized top-coal caving face with large mining depth based on the observation data of surface movement of 8512 and 8513 fully-mechanized caving face in No.8 mining area of Chenjiagou coal mine.The probabilistic integral method was used to establish the model,predicted parameters were modified by inversion simulation based on the observed data,the predicted parameters of probability integral under this condition were obtained,and the law of surface movement and deformation under full mining condition was summarized.The results show that under the conditions of large mining depth and fully mechanized caving mining,the surface is extremely inadequately mined when mining a working face.Ground surface movement and deformation are generally small due to inadequate mining depth,and surface damage is generally less than grade I.After mining,surface buildings can be used safely.After mining two working faces,the surface is inadequately mined.The range of horizontal movement of surface water is larger than that under conventional mining conditions,and the range of horizontal movement is generally larger than that of subsidence.It is expected that the surface will be fully mined after mining the fourth working face.Under the condition of insufficient mining,the subsidence basin is asymmetrically distributed,the maximum subsidence point is not above the center of the goaf.When the full mining condition is reached,the maximum subsidence value is above the center of the goaf,and the subsidence value from the center of the basin to the edge gradually decreases to zero.The values of horizontal deformation and curvature are both 0 at the inflection point.Inversion results show that the ground surface movement prediction parameters and surface movement angular parameters of the large mining depth fully mechanized caving face are expected to be 5 003 mm when the surface is expected to reach to the steady state.This achievement can provide a theoretical basis for the evaluation of “three-under” mining techniques.