采矿与安全工程学报2025，Vol.42Issue(5)：1076-1089,14.DOI:10.13545/j.cnki.jmse.2023.0502
采动应力场下巨厚覆岩层分区水压致裂关键技术
Key technology of zonal hydraulic fracturing in extra-thick overburden affected by the mining stress field
摘要
Abstract
To address the problem of high mining pressure and pronounced rock pressure manifestations caused by the extra-thick overburden,this study adopted numerical simulations and similar experiments to investigate the distribution characteristics of the mining stress field within the extra-thick overburden at different mining stages and comparatively analyze the fracture and migration characteristics of the extra-thick overburden under normal mining conditions and prefabricated fracture conditions.At last,a key technology for zonal hydraulic fracturing in the extra-thick overburden affected by the mining stress field based on directional drilling was proposed.The following research findings were obtained:During min-ing,the vertical stress within the extra-thick overburden gradually exceeds the horizontal stress due to the influence of mining abutment pressure.Vertical and horizontal hydraulic fractures can be created by con-ducting hydraulic fracturing in the stress concentration zone and the original rock stress zone of the extra-thick overburden,respectively.Prefabricated fractures can change the breakage mode of the extra-thick overburden and increase its caving height.Field applications demonstrate that the key technology of zon-al hydraulic fracturing in the extra-thick overburden affected by the mining stress field is capable of ef-fectively shortening the weighting step distance of the working face and reducing the support resistance there,thus providing safe production conditions.关键词
巨厚覆岩层/采动应力场/预制裂隙/分区致裂/定向钻孔Key words
extra-thick overburden/mining stress field/prefabricated fractures/zonal hydraulic fractu-ring/directional drilling分类
信息技术与安全科学引用本文复制引用
张晓悟,徐金海,曹悦,温双武,许志军,台连海,孙垒..采动应力场下巨厚覆岩层分区水压致裂关键技术[J].采矿与安全工程学报,2025,42(5):1076-1089,14.基金项目
国家自然科学基金联合基金项目(U21A20107) （U21A20107）
江苏省研究生科研与实践创新计划项目(KYCX23-2787) （KYCX23-2787）
中国矿业大学研究生创新计划项目(2023WLKXJ026) （2023WLKXJ026）
