采矿与安全工程学报2025，Vol.42Issue(2)：239-251,13.DOI:10.13545／j.cnki.jmse.2023.0465
背斜构造区特厚煤层开采覆岩破断失稳规律及突水压架机理
Law of overburden failure and mechanism of water inrush and support crushing in extra-thick coal seam mining within an anticline structural area
摘要
Abstract
Targeting the frequent water inrush and support crushing accidents in the anticline structural area of the mining area in western China,with the 1309 working face of Guojiahe Coal Mine as the en-gineering background,this study explored the law of overburden breakage and instability and the mecha-nism of water inrush and support crushing in extra-thick coal seam mining within an anticline structural area by means of on-site investigation,physical experiments,and theoretical analysis.The following re-search findings were obtained:1)Water inrush and support crushing accidents in the 1309 working face mainly occur in the anticline structural area with a large slope angle and a huge drop between the slope start point and the axis.The rock stratum of Yijun Formation in the roof is the key aquifer that leads to water inrush into the working face,and the 28.53-meter-thick medium-grained sandstone 102.5 m above the coal seam is the key aquiclude.2)The caving zone in the working face is 65 m high,and the broken rock blocks within this zone are disorderly distributed.The displacement curve of the rock strata in the fracture zone displays a single peak,and the maximum displacement point lies in the middle-lower part of the anticline structure.After the key aquiclude breaks,the rock stratum 100.51 m above it breaks syn-chronously and is activated.As a result,water-conducting fractures connect the aquifers of Yijun Forma-tion.3)In the anticline stage,the fracture step of the key aquiclude is 32.27 m and the fracture angle is 2.15°.The broken key aquiclude is hinged with the broken rock blocks in the goaf to form a masonry beam structure.When the confined water pressure exceeds 1.02 MPa,the fractured rock beams in the masonry beam structure rotate reversely,thereby slipping and losing stability.4)After the key aquiclude slips and loses stability,the support resistance required for roof control reaches 31,015 kN,which ex-ceeds the rated resistance of the support and hence causes support crushing in the working face.There-fore,the key to avoiding support crushing accidents in working faces lies in enhancing the stability of the key aquiclude.关键词
突水压架/背斜构造/相似材料模拟/支架围岩关系Key words
water inrush and support crushing/anticline structure/similar material simulation/rela-tionship between support and surrounding rock分类
矿山工程引用本文复制引用
刘长友,刘怀东,陈毅琪,杨培举,王晨鸿,杨敬轩..背斜构造区特厚煤层开采覆岩破断失稳规律及突水压架机理[J].采矿与安全工程学报,2025,42(2):239-251,13.基金项目
国家自然科学基金项目(52074267,52074261) （52074267,52074261）
