底板水压力作用下底抽巷对底板岩层影响试验研究  

Experiment on the influence of floor gas extraction roadway on floor strata under water pressure

作　　者：李鹏 王永涛 李见波[3] LI Peng;WANG Yongtao;LI Jianbo(Inner Mongolia Huangtaolegai Coal Co.,Ltd.,Ordos 017300,China;Shandong Energy Group xibei Mining Co.,Ltd.,Xi’an 710018,China;School of Mine Safety,North China Institute of Science and Technology,Sanhe 065201,China)

机构地区：[1]内蒙古黄陶勒盖煤炭有限责任公司,内蒙古鄂尔多斯017300 [2]山东能源集团西北矿业有限公司,陕西西安710018 [3]华北科技学院矿山安全学院,河北三河065201

出　　处：《煤炭工程》2023年第8期73-77,共5页Coal Engineering

基　　金：国家自然科学基金项目(52274201,51504095,51974126)。

摘　　要：为研究采动和承压水作用下底抽巷对底板岩层的变形与破坏的影响,基于能量守恒原理,通过传统室内相似模拟平台,分析底板水压力有效施加机制,并开展底抽巷影响下底板岩层变形与破坏相似试验。相似试验结果表明,底板岩体应力场在底抽巷道开挖阶段和工作面推采阶段分别受到两次明显扰动,巷道开挖和煤层开采后的空间提供了能量释放的通道,采动是应力场变化的重要因素,巷道对局部应力和周边位移影响明显。有底抽巷条件下底板破坏深度大于无底抽巷时情形,无底抽巷时各测线位移变化规律相近,表现为“凸”变形;存在底板巷道时,底抽巷下方的测线形态有变化且各测线的变形规律出现差异。底抽巷使得近水体处的岩体裂隙更发育,在底抽巷道附近尤其是破碎区域,需要采取相应加固措施针对性地减小底抽巷道对底板岩体隔水性能的影响。In order to study the influence of coal seam floor roadway for gas extraction on the deformation and failure of floor rock under the action of mining and confined water,the effective application device of floor water pressure was analyzed,based on the principle of energy conservation.The similar test of floor rock deformation and failure under the influence of floor extraction roadway was carried out.The results show that the stress field of floor rock mass is obviously disturbed twice,respectively in the excavation stage of the floor roadway and the mining stage of the working face.The goaf after the roadway excavation and coal seam mining provides a channel for energy release.Mining is an important factor for the change of the stress field,and the floor roadway has an obvious impact on the local stress and the local surrounding displacement.The floor failure depth under the condition of floor roadway is greater than that under the condition of no roadway extraction.The displacement change rules of the monitoring lines are similar under the condition of no floor roadway extraction,which show“convex”deformation.However,the shape of the monitoring lines below the floor roadway is changed compared with the situation of floor roadway.The floor roadway makes the rock mass fracture near the water body more developed.In the vicinity of the floor roadway,especially in those broken areas,the corresponding reinforcement measures need to be taken to reduce the influence of floor roadway on the water resistance of floor rock masses.

关 键 词：水压力 底抽巷 相似试验 限定变形 底板破坏 

分 类 号：TD322[矿业工程—矿井建设]