Study of the stress relief and gas drainage limitation of a drilling and the solving mechanism

摘要：

The stress relief mechanism and the limitation of a borehole drilling are pointed out by theoretical and numerical analysis. The stress is relieved around the borehole wall, and the gas can be drained out easily, but the periphery of the stress relief area generates annularity stress concentration to embay around the boreholes, and forms the Bottle Neck Effect (BNE) which restricts the gas drainage ability. Jetting high pressure water in the boreholes to form several slots can break the BNE, which makes the stress above and below the slots relieve sufficiently. The stress relief area is nearly 200 times larger than the stress concentration area under the same condition. The slots around a borehole improve the boreholes stress relief ability, drain out more gas, and enlarge the drainage range, which can reduce the number of the boreholes to achieve the same aim.

关键词： drilling stress relief slot BNE coal and gas outburst

作者: Yang Wei Lin Bai-quan Wu Hai-jin

作者单位: Faculty of Safety Engineering, China University of Mining & Technology. Xuzhou 221008, China State Key Laboratory of Coal Resources and Mine Safety. Xuzhou 221008, China

会议类型: 国际会议

会议名称: The 6th International Conference on Mining Science & Technology ICMST 2009(第六届国际矿业科学技术大会)

会议地点: 徐州

会议语种:英文

页码: 1-6

在线出版日期: 2009-10-18（万方平台首次上网日期，不代表论文的发表时间）