亭南煤矿工作面定向长钻孔“区域预抽+卸压防冲”可行性分析
Feasibility analysis of “regional pre-pumping and pressure relief and anti-impact” of directional long borehole in Tingnan Coal Mine working face
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摘要: 针对亭南煤矿在402工作面回采前利用普通钻机施工卸压钻孔过程中存在钻孔施工成本高、施工周期长、钻孔偏斜造成该区域抽采钻孔漏风、抽采负压减小、同时多道工序施工之间相互干扰影响巷道掘进效率等问题，通过数值模拟，利用定向钻机采用?准120 mm的定向长钻孔抽采工作面回采区域内瓦斯，采用?准150 mm的定向长钻孔对工作面回采巷道迎头和巷帮进行大直径钻孔卸压，对比分析了定向长钻孔超前迎头500 m与卸压孔超前迎头30 m施工后，超前迎头应力峰值位置、应力集中区分布范围、应力降低区分布范围、塑性区分布范围等的分布特征。结果表明：定向长钻孔卸压后的应力峰值基本分布于距巷帮2.5 m左右，且高应力集中区主要分布在距巷帮2~5 m范围，在此范围内补打定向长钻孔卸压后，应力峰值向煤体深部转移，应力集中范围减小，卸压范围增大，具有更好的卸压效果。Abstract: In view of the common use before mining at 402 face in Tingnan Coal Mine, there are some problems in the process of pressure relief drilling, such as high drilling cost, long construction period, drilling deviation, which will cause air leakage in the extraction drilling hole in this area, reduce the negative pressure of extraction and mining, and influence the efficiency of roadway excavation by the mutual interference between the construction of multiple processes, through numerical simulation, the directional drilling machine adopts the directional long borehole of 120 mm to extract the gas in the mining area of the working face, and the directional long borehole of 150 mm is used to relieve the pressure of the roadway head and the roadway side of the working face. The distribution characteristics of stress peak position, stress concentration zone, stress reduction zone and plastic zone in the lead head of directional long drilling hole with 500 m and 30 m ahead head of pressure relief hole were compared and analyzed. The results show that the stress peak of directional long borehole after pressure relief is basically distributed about 2.5 m away from the roadway, and the high stress concentration area is mainly distributed in the range of 2-5 m away from the roadway. In this range, the stress peak is transferred to the deep part of the coal, the stress concentration range is reduced, and the pressure rerange is increased, which has a better pressure relief effect.
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[1] 国家煤矿安全监察局．防治煤矿冲击地压细则[Ｍ]．北京：煤炭工业出版社，2018. [2] 刘晴．高位大直径抽采钻孔在潞安的应用[J]．煤，2021， 30（6）：81-82. LIU Qing. Application of high and large diameter pumping borehole in Lu’an[J]. Coal, 2021, 30（6）: 81-82.
[3] 彭冬，段会军，赵永哲．综放工作面高位定向钻孔层位参数优化与应用实践[J]．煤炭工程，2019，51（10）：71－76. PENG Dong, DUAN Huijun, ZHAO Yongzhe. Layer parameters optimization of high-level directional drilling in fully mechanized caving face[J]. Coal Engineering, 2019, 51（10）: 71-76.
[4] 刘军．预抽钻孔负压沿孔长变化特性及对瓦斯抽采效果影响研究[D]．焦作：河南理工大学，2014. [5] 王振亚．钻孔直径与预抽瓦斯效果关系研究[D]．焦作：河南理工大学，2012. [6] 李长兴．本煤层钻孔参数与瓦斯抽采效果关系研究[D]．焦作：河南理工大学，2014. [7] 刘国俊．淮南矿区水力冲孔技术参数优化及效果考察研究[D]．焦作：河南理工大学，2011. [8] 周连春．高瓦斯矿井超长采煤工作面瓦斯抽采理论及应用研究[D]．包头：内蒙古科技大学，2021. [9] 钟轶宁．喷丸处理Ｔｉ－6Ａｌ－4Ｖ合金残余应力场特征与演变规律研究[D]．大连：大连理工大学，2018. [10] 张明建．含软弱夹层的倾斜岩层平巷围岩失稳机制及支护技术研究[D]．焦作：河南理工大学，2009. [11] 苏赛．五阳矿高应力煤巷围岩钻孔卸压技术研究[D]．徐州：中国矿业大学，2018. [12] 张益东．锚固复合承载体承载特性研究及在巷道锚杆支护设计中的应用[D]．徐州：中国矿业大学，2013. [13] 严成增，郑宏，孙冠华，等．基于ＦDＥＭ－Ｆｌｏｗ研究地应力对水力压裂的影响[J]．岩土力学，2016，37（1）：237－246. YAN Chengzeng, ZHENG Hong, SUN Guanhua, et al. Effect of in-situ stress on hydraulic fracturing based on FDEM-Flow[J]． Rock and Soil Mechanics, 2016, 37（1）: 237-246.
[14] 朱震，张俊凯．低瓦斯矿井坚硬顶板综采工作面瓦斯防治技术研究[J]．能源与环保，2020，42（10）：25-29. ZHU Zhen, ZHANG Junkai. Research on gas prevention and control technology for fully-mechanized coal mining face in low gas mine[J]. China Energy and Environmental Protection, 2020, 42（10）: 25-29.
[15] 张先萌．裂隙煤岩体损伤演化与渗流耦合试验研究[D]．重庆：重庆大学，2017．
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