文献类型：期刊文献

英文题名：Fracturing mechanisms and deformation characteristics of rock surrounding the gate during gob-side entry retention through roof pre-fracturing

作者：Guo, Pengfei[1,2];Yuan, Yadi[1];Ye, Kengkeng[1];Sun, Dingjie[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]China Univ Min & Technol, State Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peoples R China

年份：2021

卷号：148

外文期刊名：INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000710599900001)、、EI(收录号：20214111017222)、Scopus(收录号：2-s2.0-85116939204)、WOS

基金：This work described herein was supported by the National Natural Science Foundation of China (Grant Nos. 51904188 and 41702381) and Open Fund Project of State Key Laboratory of Deep Geotechnical Me-chanics and Underground Engineering, China (Grant No. SKLGDUEK1821) . These financial supports are gratefully acknowledged.

语种：英文

外文关键词：Non-chain-pillar coal mining; Gob-side entry retention; Fracturing mechanism; Surrounding rock deformation; Support design

外文摘要：To study the fracturing mechanism and deformation characteristics of the rock surrounding the gate during gobside entry retention through roof pre-fracturing, the roof fracture laws and mechanism of the gob-side entry were analyzed. Based on the results, a 6-zone distribution law of the gob-side entry was developed through theoretical analysis. In this study, the fracturing mechanism of the gate roof in different zones and the plastic zone expansion law of the coal side were clarified through numerical simulations based on a gate in the Halagou Coal Mine. The numerical simulation results showed that the fracture mechanism of the gate roof above the coal side is closely related to the tensile strengths of the immediate roof and the main roof. The fractures above the solid coal are the main cause of the dramatic appearance of dynamic pressure in the gob-side entry. The slewing subsidence of the main roof causes the deformation of and damage to the surrounding rock to sharply increase. To ensure the stability of the gob-side entry, a support design scheme consisting of a high-pretension force, constant resistance, and the use of large deformation cables + single hydraulic props + steel beams + U section steel is proposed. The field test results showed that after the working face was mined, although the fractures in the overlying strata penetrated to the ground surface, the maximum roof and floor convergence was only 196-212 mm, which is within a reasonable range. The results of this study provide an important support design for gob-side entry retention under similar conditions.