文献类型：期刊文献

英文题名：Spatial and Temporal Distribution Law and Influencing Factors of the Mining-Induced Deformation and Failure of Gas Boreholes

作者：Xue, Fei[1,2];Feng, Xiaowei[3]

机构：[1]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Ctr Rock Mech & Geohazards, Shaoxing 312000, Peoples R China;[3]China Univ Min & Technol, Sch Mines, Minist Educ China, Key Lab Deep Coal Resource Min, Xuzhou 221116, Jiangsu, Peoples R China

年份：2018

卷号：2018

外文期刊名：ADVANCES IN MATERIALS SCIENCE AND ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000442885300001)、、EI(收录号：20183605783360)、Scopus(收录号：2-s2.0-85052709230)、WOS

基金：Financial support for this work was supported by the Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards of Zhejiang Province (PCMGH-2016-Y-05), Shaoxing Public Interest Research Projects (Grant no. 2017B70002), and the Research Start-Up Funding Project of Shaoxing University (no. 20165014).

语种：英文

外文关键词：Coal - Coal deposits - Coal industry - Deformation - Extrusion - Mine roof control - Numerical methods - Numerical models - Petroleum prospecting - Roofs - Stability

外文摘要：Because gas boreholes are easy to damage by integrated coal mining and gas exploration, based on the practice of relieving pressure in deep thin coal seams in the Huainan mining area, a multidimensional coupling numerical simulation method was used to reveal the space-time evolution characteristics and influence factors of fracture deformation of gob-side gas boreholes. Results indicate that the danger zone for borehole fractures is primarily between 5 and 12 m above the roof of the roadway. The final-hole position has little effect on the stability of boreholes, and migrating the open-hole position to the entity coal side and roadway roof side can improve the stability of the borehole. The initial failure of the borehole occurs at a distance of 10 m behind the coal face. The failure of the borehole is largely stable at a distance of 100 to 120 m behind the coal face. With the increase in mining height, which leads to an increase in the movement of strata and an increase in pressure relief range, the shear stability of the borehole is reduced, and the extrusion stability of the borehole is improved. A hard roof condition promotes borehole shear stability, while a weak roof condition promotes borehole extrusion stability. This change can decrease the maintenance difficulty associated with "minor supports" in boreholes to a certain extent by reinforcing the support strength of "primary supports" in roadway retaining walls. The simulation results are consistent with observed results for the 11 test boreholes, and the accuracy of the numerical simulation is verified.