摘要
为了确保水体下急倾斜煤层的安全回采,基于龙湖煤矿南二采区急倾斜煤层的水文工程地质条件,采用相似材料物理模拟实验,分析了急倾斜煤层覆岩破断和裂隙演化的采厚效应.结果表明:急倾斜煤层开采顶板坚硬上覆岩层存在关键层时,顶板岩梁以层状破断为主,初次破断均形成"复合破断";急倾斜煤层开采顶板岩梁初次破断后,覆岩裂隙向关键层及其上方岩层发育,不同采厚导水裂隙分布均呈"耳型"分布;随着急倾斜煤层采厚的增大,急倾斜煤层初次破断步距呈降低趋势,覆岩裂隙发育高度和初次破断厚度呈增大趋势.
In order to ensure the safety mining under water body in steep seam, based on the occurrence conditions of steep seam and hydrological engineering geological conditions in South No. 2 Section of Longhu coal mine, physical simulation was used to analyze mining height effect of overlying strata breakage and water flowing fracture evolution in steep seam. The results indicate that roof beam mainly produces layered breakage and first breakage thickness with the increase of coal seam height in steep seam.
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2012年第3期10-15,共6页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家重点基础研究发展计划(973)项目(2007CB209400)资助
关键词
急倾斜煤层
覆岩破断
关键层
导水裂隙
物理模拟
steep seam
overlying strata breakage
key stratum
water flowing fracture
physical simulation
