This paper puts forward using high-pressure water jet technology to control rock burst in roadway, and analyzes the theory of controlling rock burst in roadway by the weak structure zone model. The weak structure zone...This paper puts forward using high-pressure water jet technology to control rock burst in roadway, and analyzes the theory of controlling rock burst in roadway by the weak structure zone model. The weak structure zone is formed by using high-pressure water jet to cut the coal wall in a continuous and rotational way. In order to study the influence law of weak structure zone in surrounding rock, this paper numerically analyzed the influence law of weak structure zone, and the disturbance law of coal wall and floor under dynamic and static combined load. The results show that when the distance between high-pressure water jet drillings is 3 m and the diameter of drilling is 300 mm, continuous stress superposition zone can be formed. The weak structure zone can transfer and reduce the concentrated static load in surrounding rock, and then form distressed zone. The longer the high-pressure water jet drilling is, the larger the distressed zone is. The stress change and displacement change of non-distressed zone in coal wall and floor are significantly greater than that of distressed zone under dynamic and static combined load. And it shows that the distressed zone can effectively control rock burst in roadway under dynamic and static combined load. High-pressure water jet technology was applied in the haulage gate of 250203 working face in Yanbei Coal Mine, and had gained good effect. The study conclusions provide theoretical foundation and a new guidance for controlling rock burst in roadway.展开更多
矿井涌水量数值预测的精度与虚拟疏放孔布设的位置与时间密切相关,为提高矿井涌水量预测的精度,以蔚州矿区某矿井为例,建立基于地理信息系统(geographic information system,GIS)多源信息的奥灰含水层富水性分区评价模型,并将该分区评...矿井涌水量数值预测的精度与虚拟疏放孔布设的位置与时间密切相关,为提高矿井涌水量预测的精度,以蔚州矿区某矿井为例,建立基于地理信息系统(geographic information system,GIS)多源信息的奥灰含水层富水性分区评价模型,并将该分区评价结果导入到涌水量数值模型当中,根据矿井工作面的采掘衔接计划,通过在强富水区分阶段布设虚拟疏放孔,从而预测出研究区涌水量的动态结果。实例应用表明:本文方法提高了矿井涌水量预测的精度与实用性,对有效制订矿井疏排水方案,保障矿井安全生产具有重要的理论指导意义和实用价值。展开更多
基金supported by the National Natural Science Foundation of China (Nos. 51574243, 51404269)the Fundamental Research Funds for the Central Universities of China (No. 2014XT01)+1 种基金Guizhou Science and Technology Foundation of China (No. 20152072)the Priority Academic Program Development of Jiangsu Higher Education Institutions, China (No. SZBF2011-6B35)
文摘This paper puts forward using high-pressure water jet technology to control rock burst in roadway, and analyzes the theory of controlling rock burst in roadway by the weak structure zone model. The weak structure zone is formed by using high-pressure water jet to cut the coal wall in a continuous and rotational way. In order to study the influence law of weak structure zone in surrounding rock, this paper numerically analyzed the influence law of weak structure zone, and the disturbance law of coal wall and floor under dynamic and static combined load. The results show that when the distance between high-pressure water jet drillings is 3 m and the diameter of drilling is 300 mm, continuous stress superposition zone can be formed. The weak structure zone can transfer and reduce the concentrated static load in surrounding rock, and then form distressed zone. The longer the high-pressure water jet drilling is, the larger the distressed zone is. The stress change and displacement change of non-distressed zone in coal wall and floor are significantly greater than that of distressed zone under dynamic and static combined load. And it shows that the distressed zone can effectively control rock burst in roadway under dynamic and static combined load. High-pressure water jet technology was applied in the haulage gate of 250203 working face in Yanbei Coal Mine, and had gained good effect. The study conclusions provide theoretical foundation and a new guidance for controlling rock burst in roadway.
文摘矿井涌水量数值预测的精度与虚拟疏放孔布设的位置与时间密切相关,为提高矿井涌水量预测的精度,以蔚州矿区某矿井为例,建立基于地理信息系统(geographic information system,GIS)多源信息的奥灰含水层富水性分区评价模型,并将该分区评价结果导入到涌水量数值模型当中,根据矿井工作面的采掘衔接计划,通过在强富水区分阶段布设虚拟疏放孔,从而预测出研究区涌水量的动态结果。实例应用表明:本文方法提高了矿井涌水量预测的精度与实用性,对有效制订矿井疏排水方案,保障矿井安全生产具有重要的理论指导意义和实用价值。