“三硬”煤层巷道冲击地压发生机理研究

发布时间：2018-02-27 23:24

本文关键词： 冲击地压 “三硬”条件冲击机理水平荷载巷道宽度　出处：《采矿与安全工程学报》2017年04期 　论文类型：期刊论文

【摘要】：结合现场实测、理论分析和数值模拟等方法,系统研究了"三硬"煤层巷道冲击地压发生的机理。现场地应力测量结果表明,大同矿区存在明显的水平构造应力,通过力学分析发现侧压系数与煤壁冲击线性相关;用关键层理论对坚硬底板冲击地压进行了分析,认为其影响因素有:底板关键层的厚度及其与底板表面的距离、水平构造应力以及工作面采动等;由数值分析结果可知:巷帮的水平位移与施加的水平载荷呈线性正比关系,当水平载荷足够大时,若巷帮一定深度范围内存在或产生了垂直裂隙,且顶底板岩层与煤层分离,巷帮将发生煤壁整体推出型冲击地压;底板岩层水平拉应力最大值随着巷道宽度的增加逐渐向底板深处发展并出现离层,导致底板关键层突然断裂,发生底板冲击地压。
[Abstract]:Combined with the methods of field measurement, theoretical analysis and numerical simulation, the mechanism of rock burst in the roadway of "three hard" coal seam is systematically studied. The in-situ stress measurement results show that there are obvious horizontal tectonic stresses in Datong mining area. Through the mechanical analysis, it is found that the lateral pressure coefficient is linearly related to the coal wall impact, and the critical layer theory is used to analyze the impact ground pressure of the hard bottom plate, and it is considered that the influencing factors are: the thickness of the key layer of the bottom plate and the distance between the critical layer and the surface of the bottom plate. The results of numerical analysis show that the horizontal displacement of roadway side is linear proportional to the applied horizontal load, and when the horizontal load is large enough, If the vertical crack exists or produces in a certain depth range and the roof and floor rock layer is separated from the coal seam, the wall of roadway will be pushed out as a whole. With the increase of roadway width, the maximum horizontal tensile stress of floor rock layer develops gradually to the depth of the floor, which leads to the sudden fracture of the key layer of the bottom plate and the occurrence of ground pressure impact on the floor.
【作者单位】：山西工程技术学院;太原理工大学山西省绿色矿山工程技术研究中心;太原理工大学矿业工程学院;
【基金】：国家自然科学基金优秀青年科学基金项目(51422404);国家自然科学基金项目(51574172) 山西省平台基地和人才专项项目(优秀人才科技创新项目)(201605D211003) 山西省高等学校创新人才支持计划项目山西省煤基重点科技攻关项目(MQ2014-12)
【分类号】：TD324

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