采场支承压力分区变异特征研究  

Character of the Zonal Variation of Abutment Pressure in Working Faces

作　　者：唐军华[1] 白海波[2] 杜锋[2] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《采矿与安全工程学报》2011年第2期293-297,共5页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2007CB209400);国家自然科学基金重点项目(50634050);江苏省创新学者攀登项目(BK2008007);江苏高校优势学科建设工程项目

摘　　要：通过数值模拟、X光衍射、扫描电镜、现场实测等手段,研究了两淮矿区不同采深和采厚情况下回采工作面前方支承压力分区变异特征.结果表明,超浅部风氧化带内开采时,岩石由于受到沉积水环境和风化的影响,强度降低,塑性变形能力增强,压力呈现静压大,动压小,动载系数小的趋势;开采进入常规深度时,岩石弹性变形能力增强,支承压力峰值强度也随着采深增加而增加,峰值压力集中系数增加;开采进入深部时,由于高温度和高地压等因素影响,岩石的强度降低,塑性变形能力增强,支承压力峰值强度增加,但峰值压力集中系数却呈下降趋势,岩层逐渐呈现出黏塑性变形;随着开采煤层的厚度增加,采场前方支承压力峰值集中系数减小,峰值离煤壁越远.Based on the numerical simulation,the X-ray diffraction experiment,the scanning electron microscopy observation,and the in-situ observations,the zonal variation characteristic of abutment pressure for different mining depth and thickness in North Anhui mining area is discussed.The result indicates that,because of the deposition water environment and weathering,1） rock strength decreases while the plastic deformation capacity is reinforces,2） there is a tendency of high in static pressure and low in dynamic pressure and dynamic load coefficient in the shallow weathering zone.While reaching the conventional depth,rock elasticity deformation capacity is reinforced,with the increase of mining depth,the peak value of abutment pressure and stress concentration factor also increase;When reaching a great mining depth,because of the high temperature and high ground pressure,rock strength decreases and the plastic deformation capacity is reinforced,the intensity of peak value of abutment pressure increases.However,the stress concentration coefficient shows a decrease tendency and the rock strata gradually shows a visco-plastic deformation.With the increase of coal seam thickness,the stress concentration coefficient decreases and the peak value is far away from coal wall.

关 键 词：支承压力 采深 采厚 数值模拟 分区变异 

分 类 号：TD311[矿业工程—矿井建设]