岩土工程学报2017，Vol.39Issue(6)：1115-1122,8.DOI:10.11779/CJGE201706018
大直径钻孔卸压机理室内及数值试验研究
Laboratory and numerical experiments on pressure relief mechanism of large-diameter boreholes
贾传洋 1蒋宇静 2张学朋 1王冬 1栾恒杰 3王长盛1
作者信息
- 1. 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590
- 2. 临沂大学建筑学院,山东临沂276000
- 3. 长崎大学工学部,日本长崎852-8521
- 折叠
摘要
Abstract
The technology of borehole pressure relief is an effective way to reduce the elastic energy accumulation in the surrounding rock of roadways,which can reduce the risk of regional rock bursts.Therefore,the studies on the pressure relief mechanism of large-diameter boreholes and the corresponding reasonable parameters are of high engineering application value.A series of laboratory experiments are conducted to analyze the effects of different parameters such as borehole radius,spacing and depth on the uni-axial compression strength (UCS) and failure patterns of samples.The particle flow code (PFC) is used to quantify the micro-cracks and simulate their corresponding propagation process.The laboratory and numerical results show that the stress release resulting from propagation and coalescence of micro-cracks is the basic reason for the pressure relief around the surrounding rock ofboreholes.The micro-cracks around the surrounding rock increase with the increase of radius and depth of boreholes,and the main crack becomes much more serious,resulting in larger pressure relief.In addition,as the borehole spacing decreases,UCS of samples decreases and the corresponding failure pattern changes from independent one to transfixing one,leading to a much more obvious pressure relief effect.关键词
大直径钻孔/卸压机理/室内试验/数值试验Key words
large-diameter borehole/pressure relief mechanism/laboratory experiment/numerical experiment分类
建筑与水利引用本文复制引用
贾传洋,蒋宇静,张学朋,王冬,栾恒杰,王长盛..大直径钻孔卸压机理室内及数值试验研究[J].岩土工程学报,2017,39(6):1115-1122,8.
