深部大倾角厚煤层开采能量演化规律与冲击地压发生机理  

Energy evolution law and rock burst mechanism of deep thick seams with large inclination

作　　者：薛成春 曹安业[1,2] 郭文豪 刘耀琪 温颖远[1] 胡阳 李许伟[1] XUE Chengchun;CAO Anye;GUO Wenhao;LIU Yaoqi;WEN Yingyuan;HU Yang;LI Xuwei(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]中国矿业大学江苏省矿山地震监测工程实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2021年第5期876-885,共10页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51734009,51674253,51874292,51804303);山东省重大科技创新工程项目(2019SDZY02);江苏省自然科学基金项目(BK20180643)。

摘　　要：针对某矿大倾角厚煤层高应力区工作面开采期间强矿震事件频发的问题,采用理论分析、数值模拟和现场实测方法对其开采能量演化规律、冲击地压机理开展研究。建立了倾斜悬顶结构力学模型,理论分析了工作面顶板能量分布特征,确定了工作面下部端头、中上部为悬顶弯曲变形能积聚程度高的2个重点区域;模拟结果表明,大倾角厚煤层顶板能量积聚于工作面下部端头、中上部区域,底板能量积聚于工作面下部端头区,能量积聚区域呈明显不对称分布;受下层煤局部缺失影响,大倾角厚煤层工作面围岩应力、能量峰值分别增高12.7%,46.2%,能量积聚范围扩大;基于大倾角厚煤层开采能量分布特征及诱冲机理,提出工作面冲击地压防治思路和重点区域,制定了顶板定向深孔爆破释能降载防治方案,有效降低了倾斜悬顶应力、能量水平,避免了大倾角厚煤层高应力区冲击地压的发生,可为类似条件下工作面冲击地压防治提供借鉴指导。In view of frequent occurrence of strong mining tremors activities during mining in stress concentration area of thick seams with large inclination in a mine,energy evolution law and rock burst mechanism of the working face was studied through theoretical analysis,numerical simulation,and field measurement.The mechanical model of inclined hanging roof structure was established,the roof energy distribution characteristics of working face were analyzed theoretically,and the lower and middle upper part of the working face were determined as two key areas with high accumulation of bending deformation energy of hanging roof.The simulation results have shown that the roof energy accumulates in the lower end,middle and upper part of the working face,the floor energy accumulates in the lower end of the working face,and the energy accumulation area presents an obvious asymmetric distribution.The stress and peak energy of surrounding rock in the working face of thick seams with large inclination increases by 12.7%and 46.2%respectively due to partial loss of lower coal,and the range of energy accumulation is further expanded.Based on the characteristics of roof energy distribution and the mechanism of rock burst in thick seams with large inclination,ideas and key areas for rock burst prevention and control in the working face were proposed,and pressure relief plan of roof directional deep hole blasting was formulated to reduce stress and energy level of inclined suspended roof,which can effectively avoid the occurrence of rock burst in stress concentration area of thick seams with large inclination,and provide reference and guidance for rock burst prevention and control in working faces under similar conditions.

关 键 词：大倾角煤层 冲击地压 悬顶结构 能量演化 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]