摘要
为揭示煤岩组合锚固体拉拔过程中分时破裂演化规律,基于数值仿真方法验证倾斜煤岩分界面煤岩组合锚固体存在分时破裂现象的基础上,进行了锚杆拉拔试验,研究了不同拉拔速率和煤岩分界面不同倾角条件下煤岩组合锚固体分时破裂演化规律。结果表明:煤岩分界面倾角为0时,拉拔速率的增大虽然会降低煤岩组合锚固体整体破坏脱黏时间,但对煤体与岩体之间分时破裂并无明显影响。相比于拉拔速率,煤岩分界面倾角对煤岩组合锚固体分时破裂影响显著,当煤岩分界面倾角小于45°时,煤岩组合锚固体整体破坏脱黏所需时间较长,使得煤体与岩体之间分时破裂差异更加明显,间隔时间约34 s;当煤岩分界面倾角增大至60°时,煤岩组合锚固体整体破坏脱黏所需时间大幅减小,煤体与岩体之间分时破裂差异性显著减小,间隔时间降低至约24 s。
In order to reveal the development law of time-division fracture on the coal-rock composite anchor during the pull-out process, based on the verification of the phenomenon of time-division fracture on the coal-rock composite anchor at the inclined coal-rock interface by the numerical simulation method, the bolt pull-out tests were carried out. And the development laws of time-division fracture on the coal-rock composite anchor under the conditions of different pull-out rates and dip angles of coal-rock interface were studied. The results show that when the dip angle of the coal-rock interface is 0, the increase of the pull-out rate will reduce the overall failure and debonding time of the coal-rock composite anchor, but it has no obvious effect on the time-division fracture between the coal body and the rock mass. Compared with the pull-out rate, the dip angle of the coal-rock interface has a significant impact on the time-division fracture of the coal-rock composite anchor. When the dip angle of the coal-rock interface is less than 45°, the overall failure and debonding time of the coal-rock composite anchor is longer, leading to a more obvious difference between the time-division fracture of the coal body and the rock body, with an interval of about 34 s. When the dip angle of the coal-rock interface increases to 60°, the time required for the overall failure and debonding of the coal-rock composite anchor body is significantly reduced, and the difference between the time-division fracture between the coal body and the rock body is significantly reduced, with the interval time reduced to about 24 s.
作者
张盼栋
高林
战新宇
赵志强
许帅
赵世毫
申业兴
ZHANG Pandong;GAO Lin;ZHAN Xinyu;ZHAO Zhiqiang;XU Shuai;ZHAO Shihao;SHEN Yexing(Mining College,Guizhou University,Guiyang,Guizhou 550025,China;Research Center of Roadway Support and Disaster Prevention Engineering in Coal Industry,China University of Mining and Technology(Beijing),Beijing 100083,China;National&.Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guizhou University,Guiyang,Guizhou 550025,China;School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第3期111-117,共7页
Mining Research and Development
基金
国家自然科学基金项目(52004073,52264008)
贵州省科技支撑计划项目(黔科合支撑[2021]一般400,黔科合支撑[2023]一般288)
贵州大学引进人才科研基金项目(贵大人基合字[2020]42号)
贵州大学培育项目(贵大培育[2019]27号)。
关键词
煤岩组合锚固体
拉拔试验
数值模拟
分时破裂
演化规律
Coal-rock composite anchor
Pull-out test
Numerical simulation
Time-division fracture
Development law
