竖直恒载循环作用下煤层钻孔失稳演化研究

doi:10.13722/j.cnki.jrme.2019.0558

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摘要为研究采动影响下煤层钻孔的长时失效机制，采用自主研制的双向加载试验装置开展竖直应力多次循环下钻孔失稳的模型试验。结果表明，恒压阶段钻孔的收缩具有显著的时效性，而升压阶段加剧了钻孔收缩，引入的钻孔收缩模型较好的描述了孔径变化规律；多次循环虽然促使钻孔收缩，但钻孔收缩速率随之衰减。成孔初期围岩损伤剧烈、裂纹发育，但孔壁处裂纹不明显，损伤效应主要表现为钻孔收缩；在第1次循环的恒压段，围岩持续损伤并趋稳，孔壁损伤加强；升压阶段破坏了原有的稳定，加剧了孔壁的损伤并扩大了损伤范围，提高了煤岩剥落的风险，但升压对围岩的损伤程度随循环次数的增多而下降；多次循环后，围岩损伤积累，裂纹进一步扩展、贯通，导致严重的失稳。

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	王志明1
	孙玉宁1
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	张硕1
	宋维宾1
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	王永龙1
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关键词 ：采矿工程, 煤层钻孔, 循环恒压, 损伤, 声发射

Abstract：To illuminate the long-time failure mechanisms for in-seam boreholes influenced by mining disturbances，the model experiment tests under a cyclic vertical stress were carried out by employing a independently-developed bi-direction loading device. Results show that the shrinkage of the borehole has obvious time effect at the constant stress stage and increases at the boost stress stage，which can be described well by the introduced borehole shrinkage model. Cycle loading makes the borehole shrink but the shrinkage rate decreases with increasing the cycle number. At the initial stage after drilling，the surrounding rock damages intensely with tiny fractures accompanied by no obvious cracks on the hole wall，which mainly causes borehole shrinkage. At the constant stress stage at the first cycle，the damage of the surrounding rock continues and tends to be stable，and the damage on the hole wall is enhanced. At the boost stress stage，the damage on the hole wall increases further and the damage range is enlarged，which raises the possibility of rock peeling from the hole wall. Meanwhile，the influence of stress boosting to the damage of the surrounding rock decreases with increasing the cycle number of loading. After repeatedly loading cycles，the damage of the surrounding rock accumulates and fractures propagate and link，inducing serious instability of the hole.

Key words： mining engineering in-seam borehole cyclic constant stress damage acoustic emission

引用本文:

王志明1，孙玉宁1，2，张硕1，宋维宾1，2，王永龙1，2. 竖直恒载循环作用下煤层钻孔失稳演化研究[J]. 岩石力学与工程学报, 2020, 39(2): 262-271.
WANG Zhiming1，SUN Yuning1，2，ZHANG Shuo1，SONG Weibin1，2，WANG Yonglong1，2. Study on failure evolution of in-seam boreholes under cycle constant vertical loadings. , 2020, 39(2): 262-271.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0558 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I2/262

[2]	周福宝，孙玉宁，李海鉴，等. 煤层瓦斯抽采钻孔密封理论模型与工程技术研究[J]. 中国矿业大学学报，2016，45(3)：433-439.(ZHOU Fubao，SUN Yuning，LI Jinhai，et al. A study of the second hole sealing method to improve gas drainage in coal seams[J]. Journal of China University of Mining Technology，2016，45(3)：433-439.(in Chinese))
[7]	刘保县，黄敬林，王泽云，等. 单轴压缩煤岩损伤演化及声发射特性研究[J]. 岩石力学与工程学报，2009，28(增1)：3 234-3 238.(LIU Baoxian，HUANG Jinglin，WANG Zeyun，et al. Study on damage evolution and acoustic emission characteristic of coal-rock under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.1)：3 234-3 238.(in Chinese))
[5]	艾婷，张茹，刘建锋，等. 三轴压缩煤岩破裂过程中声发射时空演化规律[J]. 煤炭学报，2011，36(12)：2 048-2 057.(AI Ting，ZHANG Ru，LIU Jianfeng，et al. Space-time evolution rules of acoustic emission locations under triaxial compression[J]. Journal of the China Coal Society，2011，36(12)：2 048-2 057.(in Chinese))
[9]	曹树刚，刘延保，张立强，等. 突出煤体单轴压缩和蠕变状态下的声发射对比试验[J]. 煤炭学报，2007，32(12)：1 264-1 268.(CAO Shugang，LIU Yanbao，ZHANG Liqiang，et al. Experimental on acoustic emission of outburst-hazardous coal under uniaxial compression and creep[J]. Journal of China Coal Society，2007，32(12)：1 264-1 268.(in Chinese))
[12]	WANG Z M，SUN Y N. Swelling pressure of double- expansive material and its active support effect for coal seam gas drainage borehole[J]. Advances in Materials Science and Engineering，2018，(8)：1-12.
[14]	石占山，梁冰，王岩，等. 下分层不同层位千米钻孔稳定性研究[J]. 应用数学和力学，2017，38(9)：79-90.(SHI Zhanshan，LIANG Bing，WANG Yan，et al. Study of kilometer drilling stability at different strata beneath the floor[J]. Applied Mathematics and Mechanics，2017，38(9)：79-90.(in Chinese))
[15]	尹光志，鲁俊，李星，等．真三轴应力条件下钻孔围岩稳定性及塑性区特性[J]. 煤炭学报，2018，43(10)：2 709-2 717.(YIN Guangzhi，LU Jun，LI Xing，et al．Stability and plastic zone characteristics of surrounding rock under true triaxial stress conditions[J]. Journal of China Coal Society，2018，43(10)：2 709-2 717. (in Chinese))
[17]	王凯，郑吉玉，朱奎胜. 两种应力路径下无烟煤的变形破坏特征及能量分析[J]. 岩土力学，2015，36(增2)：259-266.(WANG Kai，ZHENG Jiyu，ZHU Kuisheng. Analysis of deformation failure characteristics and energy of anthracite under two kinds of stress paths[J]. Rock and Soil Mechanics，2015，36(Supp.2)：259-266.(in Chinese))
[19]	陈红江，李夕兵，刘爱华，等. 水下开采顶板突水相似物理模型试验研究[J]. 中国矿业大学学报，2010，39(6)：854-859.(CHEN Jianghong，LI Xibing，LIU Aihua，et al. Physical simulation modeling of roof water inrush in underwater mining[J]. Journal of China University of Mining Technology，2010，39(6)：854-859.(in Chinese))
[22]	王永龙，孙玉宁，翟新献，等. 基于GSI原理瓦斯抽采钻孔收缩比评估方法及其应用[J]. 中国安全生产科学技术，2015，11(2)：105-111.(WANG Yonglong，SUN Yuning，ZHAI Xinxian，et al. The evaluation method and application of gas drainage borehole shrinkage ratio based on GSI principle[J]. Journal of Safety Science and Technology，2015，11(2)：105-111.(in Chinese))
[25]	王小琼，葛洪魁，宋丽莉，等. 两类岩石声发射事件与Kaiser效应点识别方法的试验研究[J]. 岩石力学与工程学报，2011，30(3)：580-588.(WANG Xiaoqiong，GE Hongkui，SONG Lili，et al. Experimental study of two types of rock sample acoustic emission events and Kaiser effect point recognition approach[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(3)：580-588.(in Chinese))
[1]	程远平，付建华，俞启香. 中国煤矿瓦斯抽采技术的发展[J]. 采矿与安全工程学报，2009，26(2)：127-139.(CHENG Yuanping，FU Jianhua，YU Qixiang. Development of gas extraction technology in coal mines of China[J]. Journal of Mining and Safety Engineering，2009，26(2)：127-139.(in Chinese))
[3]	WANG Z M，SUN Y N，WANG Y L. A coupled model of air leakage in gas drainage and an active support sealing method for improving drainage performance[J]. Fuel，2019，237：1 217-1 227.
[4]	石占山，梁冰，王岩，等. 加载与卸载过程瓦斯抽采钻孔变形特征[J]. 煤炭学报，2017，42(6)：1 458-1 465.(SHI Zhanshan，LIANG Bing，WANG Yan，et al. Deformation characteristics of gas drainage borehole in loading and unloading[J]. Journal of the China Coal Society，2017，42(6)：1 458-1 465.(in Chinese))
[6]	徐涛，杨天鸿，唐春安，等. 孔隙压力作用下煤岩破裂及声发射特性的数值模拟[J]. 岩土力学，2004，25(10)：1 560-1 564.(XU Tao，YANG Tianhong，TANG Chun'an，et al. Numerical simulation of failure and induced acoustic emission characteristics of coal/rock underpore pressure[J]. Rock and Soil Mechanics，2004，25(10)：1 560-1 564.(in Chinese))
[8]	杨永杰，王德超，李博. 煤岩三轴压缩损伤破坏声发射特征[J]. 应用基础与工程科学学报，2015，23(1)：127-135.(YANG Yongjie，WANG Dechao，LI Bo. Acoustic emission characteristics of coal damage failure under triaxial compression[J]. Journal of Basic Science and Engineering，2015，23(1)：127-135.(in Chinese))
[10]	张超. 钻孔封孔段失稳机制分析及加固式动态密封技术研究[博士学位论文][D]. 徐州：中国矿业大学，2014.(ZHANG Chao. Research on instability mechanism for sealing segment of boreholes and reinforcing dynamic sealing techniques[Ph. D. Thesis][D]. Xuzhou：China University of Mining Technology，2014.(in Chinese))
[11]	LIU C，ZHOU F B，KANG J H，et al. Application of a non-linear viscoelastic-plastic rheological model of soft coal on borehole stability[J]. Journal of Natural Gas Science and Engineering，2016，36：1 303-1 311.
[13]	王志明，孙玉宁，王永龙，等. 瓦斯抽采钻孔动态漏气圈特性及漏气处置研究[J]. 中国安全生产科学技术，2016，12(5)：139-145.(WANG Zhiming，SUN Yuning，WANG Yonglong，et al. Study on dynamic air-leakage ring characters and air-leakage disposal of gas extraction borehole[J]. Journal of Safety Science and Technology，2016，12(5)：139-145.(in Chinese))
[24]	马德新，方英. 井壁岩石流动和软化特性的力学分析[J]. 钻采工艺，2000，23(1)：17-20.(MA Dexin，FANG Ying. Mechanics analysis on sidewall rock behavior of flow and softening[J]. Drilling and Production Technology，2000，23(1)：17-20.(in Chinese))
[16]	郤保平，赵阳升，张昌锁，等. 高温高压下花岗岩中钻孔变形规律实验研究[J]. 岩土工程学报，2010，32(2)：253-258.(XI Baoping，ZHAO Yangsheng，ZHANG Changsuo，et al. Drilling deformation in granite under high temperatures and stresses[J]. Chinese Journal of Geotechnical Engineering，2010，32(2)：253-258.(in Chinese))
[18]	邵冬亮，李术才，李明田，等. 单轴压缩条件下不同裂纹制作方式的裂纹破坏分析及其声发射特征研究[J]. 山东大学学报：工学版，2011，41(3)：131-136.(SHAO Dongliang，LI Shucai，LI Mingtian，et al. Study of failure analysis and the acoustic emission signature of 3-D crack from different origins under uniaxial compression[J]. Journal of Shandong University：Engineering Science，2011，41(3)：131-136.(in Chinese))
[20]	任松，郭松涛，姜德义，等. 盐岩蠕变相似模型及相似材料研究[J]. 岩土力学，2011，32(增1)：106-110.(REN Song，GUO Songtao，JIANG Deyi，et al. Study of creep similar model and creep equivalent material of salt rock[J]. Rock and Soil Mechanics，2011，32(Supp.1)：106-110.(in Chinese))
[21]	王宗炼，任会兰，宁建国. 基于小波变换降噪的声发射源定位方法[J]. 振动与冲击，2018，37(4)：34-38.(WANG Zonglian，REN Huilan，NING Jianguo. Acoustic emission source location based on wavelet transform de-noising[J]. Journal of Vibration and Shock，2018，37(4)：34-38.(in Chinese))
[23]	郝福昌，支光辉，孙丽娟. 考虑流变特性的抽放钻孔应力分布和移动变形规律研究[J]. 采矿与安全工程学报，2013，30(3)：449-456.(HAO Fuchang，ZHI Guanghui，SUN LiJuan. Stress distribution and movement law around drainage borehole when considering rheological property[J]. Journal of Mining and Safety Engineering，2013，30(3)：449-456.(in Chinese))