准格尔煤田龙王沟煤矿特厚煤层综放开采地表沉陷规律  

Surface subsidence law in fully-mechanized caving mining of extra-thick seam in Longwanggou Coal Mine of Zhungeer coalfield

作　　者：张海君 吴奕枢 王飞[2] 谢昆仑 ZHANG Haijun;WU Yishu;WANG Fei;XIE Kunlun(Ordos Guoyuan Mining Development Co.,Ltd.,Ordos 017000,China;School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]鄂尔多斯市国源矿业开发有限责任公司,内蒙古鄂尔多斯017000 [2]郑州大学力学与安全工程学院,河南郑州450001

出　　处：《西安科技大学学报》2022年第5期874-883,共10页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(51904272)。

摘　　要：在特厚煤层综放开采过程中,工作面各上覆岩层受其影响相继发生变形、垮落,使地表出现不均匀沉降,产生塌陷、裂缝等,严重威胁矿井及其周边地区人员和生产设施安全。因此,地表沉陷变化规律的研究对沉陷区范围预测和治理均有重要意义。文中以准格尔煤田龙王沟煤矿61601特厚煤层综放工作面为研究对象,建立基于概率积分法的地表沉陷预计模型,并对计算结果加以分析,结果显示特厚煤层综放开采地表下沉情况基本符合概率积分法预计模型,但其发生沉陷的区域范围更小,沉陷区域边界坡度更大,特厚煤层综放开采地表沉陷情况相较一般开采呈现出下沉速度快、下沉幅度剧烈、变形分别集中的特征。同时运用FLAC数值模拟技术对地表沉陷形成机制和动态变化过程进行补充,FLAC数值模拟能更为全面地体现地表沉陷规律。此外,文中还进一步结合FLAC数值模拟和实测沉陷结果分析了不同推进长度下走向和倾向主断面地表下沉曲线、走向地面测点下沉速度变化情况、开采区域总体位移情况等,归纳出特厚煤层综放开采地表沉陷规律及特征,为合理规划煤矿开采作业方案提供理论依据。During the fully-mechanized caving mining of extra-thick coal seams, the overlying strata of the working face are successively deformed and collapsed under the influence of mining, resulting in uneven settlement, collapse, cracks and other accidents on the surface, which seriously threatens the safety of personnel and production facilities in the mine and its surrounding areas.Therefore, it is of great significance to study the variation law of surface subsidence for the prediction and control of the subsidence area.In this paper, the surface subsidence prediction model based on the probability integral method was established for the 61601 extra-thick coal seam comprehensive mining face of Longwanggou coal mine in Zhungeer coalfield.The results showed that the surface subsidence of the fully-mechanized caving mining of extra-thick coal seam was basically in accordance with the prediction model of the probability integral method, but the area where subsidence occurs is smaller and the slope of the boundary of the subsidence area is larger.The surface subsidence of fully-mechanized caving mining of extra-thick coal seams presents the characteristics of fast subsidence speed, intense subsidence magnitude and concentrated deformation respectively compared with the general mining. And the FLACnumerical simulation technology was applied to supplement the formation mechanism as well as dynamic change process of surface subsidence, which show that FLACnumerical simulation can reflect the surface subsidence law more comprehensively.In addition, a detailed analysis has been made has been made of the followings: the surface subsidence curves of the strike and inclination main sections under different propulsion lengths, the changes of the subsidence speed of the strike ground measurement points, and the overall displacement of the mining area by combining the results of FLACnumerical simulation and the measured subsidence, with the surface subsidence law summarized and the characteristics revealed of comprehensive mining in

关 键 词：特厚煤层 地表沉陷 FLAC3D 概率积分法 

分 类 号：TD822[矿业工程—煤矿开采]