非等压应力场上向长距离穿层瓦斯抽采钻孔密封长度研究

doi:10.13722/j.cnki.jrme.2017.1014

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摘要

针对双向非等压应力场上向长距离瓦斯抽采钻孔密封长度难以确定、现场封孔难度大的问题，以平煤六矿为工程背景，以弹塑性理论和Mohr-Coulomb准则为基础，得出圆形巷道非等压应力场下塑性区边界方程，通过FLAC^3D数值模拟映证了理论分析结果：当侧压系数不为1时，巷道围岩塑性区边界是对称的“蝴蝶形”，不再是等压力应力场下的圆形，且巷道围岩应力呈非均匀分布，应力沿巷道径向变化的梯度和围岩应力降低区的范围沿不同角度时也存在明显差异；理论分析和数值模拟计算的塑性区深度偏差小于5%。结合塑性区的变化规律确定了不同角度上向穿层钻孔的密封长度，提出更具针对性的新型逐级注浆封孔技术。瓦斯抽采试验表明：按照本文确定的密封长度对上向穿层钻孔进行密封时，孔内抽采负压均在13 kPa以上，最高瓦斯抽采浓度是传统等压应力场下对比试验孔的1.4倍，且其衰减速率较慢，瓦斯抽采效果可以满足长期高效抽采的要求。

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	章光1
	吴金刚1
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关键词 ：采矿工程, 非等压应力场, 上向抽采钻孔, 密封长度, 塑性区方程, 逐级封孔技术

Abstract：

In the gas drainage of coal mines，it is difficult to seal boreholes and determine the sealing length of upward long crossing boreholes under biaxial unequal stress fields. To solve the problem，No.6 mine of Pingdingshan coal group was taken as the engineering example. On the basis of elastic-plastic theories and Mohr-Coulomb criterion，the boundary equations of plastic zones in the surrounding rocks of the circular roadway under unequal stress fields were deduced. The theoretical analysis results were then verified by numerical simulation(FLAC^3D). It was concluded that the boundary shape of plastic zones in surrounding rocks was not circular but symmetrical butterfly-shaped form under equal stress fields，when the lateral pressure coefficient was not equal to 1. The stress of surrounding rocks was distributed unevenly and its gradient changed significantly. Moreover，the obvious difference was observed on the scope of stress-relaxed areas of surrounding rocks with different angles. The deviation of plastic-zone depth calculated by theory and numerical simulation was lower than 5%. The reasonable sealing length of boreholes was determined finally considering the change laws of plastic zones. In addition，a new sealing technology was proposed aiming at sealing upward boreholes. The field test results show that the negative pressure of gas drainage in boreholes is more than 13 kPa，and the maximum concentration of gas drainage is 1.4 times that of testing boreholes under equal stress fields. Furthermore，the concentration of gas drainage decays slowly. The test effect can meet the need of long-term and high-efficient gas drainage.

Key words： mining engineering unequal stress field upward borehole for gas drainage sealing length boundary equation of plastic zone step-by-step sealing technology

引用本文:

章光1，吴金刚1，2，杨龙杰3. 非等压应力场上向长距离穿层瓦斯抽采钻孔密封长度研究[J]. 岩石力学与工程学报, 2018, 37(S1): 3422-3431.
ZHANG Guang1，WU Jingang1，2，YANG Longjie3 . Determination of the sealing length of upward long crossing boreholes for gas drainage under unequal stress fields. , 2018, 37(S1): 3422-3431.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1014 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS1/3422

[1]	刘健，刘泽功，高魁，等. 深孔爆破在综放开采坚硬顶煤预先弱化和瓦斯抽采中的应用[J]. 岩石力学与工程学报，2014，33(增1)：3361-3367.(LIU Jian，LIU Zegong，GAO Kui，et al.Application of deep borehole blasting to top-coal pre-weakening and gas extraction in fully mechanized caving[J].Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.1)：3361-3367.(in Chinese))
[2]	岳乾，李希建，陈守坤，等. 底抽巷上向穿层瓦斯抽采钻孔封孔工艺优化研究[J]. 煤炭技术，2014，33(12)：42-46.(YUE Qian，LI Xijian，CHEN Shoukun，et al.Optimization research of hole sealing process of upward-cross gas drainage drill-hole on roadway of coalface¢s bottom[J]. Coal Technology，2014，33(12)：42-46.(in Chinese))
[3]	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))
[1]	李季，程五一，李敏，等. 新型封孔材料的性能研究及密封长度计算[J]. 中国安全生产科学技术，2011，7(2)：42-45.(LI Ji，CHENG Wuyi，LI Min，et al.Analysis on performances of new sealing drill-hole material and calculation of sealing length[J]. Journal of Safety Science and Technology，2011，7(2)：42-45.(in Chinese))
[1]	程志恒. 底抽巷穿层钻孔封孔深度与布孔间距优化研究[J]. 煤炭科学技术，2017，45(2)：76-82.(CHENG Zhiheng. Study on optimization of strata passing borehole sealing depth and borehole layout space in floor gas drainage gateway[J]. Coal Science and Technology，2017，45(2)：76-82.(in Chinese))
[4]	郝富昌，孙丽娟，刘明举. 考虑塑性软化和扩容特性的最短封孔深度研究[J]. 中国矿业大学学报，2014，43(5)：789-793.(HAO Fuchang，SUN Lijuan，LIU Minju. Study of shortest sealing depth with considering plastic softening and dilatancy[J]. Journal of China University of Mining and Technology，2014，43(5)：789-793.(in Chinese))
[5]	刘庆军，董庆祥. 首山一矿顺层抽采钻孔合理封孔深度研究[J]. 煤炭技术，2015，34(2)：123-125.(LIU Qingjun，DONG Qingxiang. Research on reasonable hole sealing depth down seam for Shoushan First Mine[J]. Coal Technology，2015，34(2)：123-125.(in Chinese))
[6]	ZHANG K，SUN K，YU B，et al. Determination of sealing depth of in-seam boreholes for seam gas drainage based on drilling process of a drifter[J]. Engineering Geology，2016，210：115-123.
[7]	PUSCH R，RAMQVIST G，KNUTSSON S，et al. Modern method for sealing deep boreholes[J]. Engineering Geology，2016，202：132-142.
[8]	郭建卿，杨子泉，唐辉. 侧压系数对巷道变形及周边应力分布规律影响[J]. 采矿与安全工程学报，2011，28(4)：566-570.(GUO Jianqing，YANG Ziquan，TANG Hui. The effect of lateral pressure coefficient on deformation and stress distribution rules around roadway[J]. Journal of Mining and Safety Engineering，2011，28(4)：566-570.(in Chinese))
[1]	王学滨，伍小林，潘一山. 圆形巷道围岩层裂或板裂化的等效连续介质模型及侧压系数的影响[J]. 岩土力学，2012，33(8)：2395- 2402.(WANG Xuebin，WU Xiaolin，PAN Yishan. An equivalent continuum model for exfoliation or slabbing phenomenon of surrounding rock of circular tunnel and effects of lateral pressure coefficients[J]. Rock and Soil Mechanics，2012，33(8)：2395- 2402.(in Chinese))
[2]	蔡美峰. 岩石力学与工程[M]. 北京：科学出版社，2002：308-311.(CAI Meifeng. Rock Mechanics and Engineering[M]. Beijing：Science Press，2002：308-311.(in Chinese))
[3]	林柏泉，周世宁，张仁贵. 煤巷卸压带及其在煤和瓦斯突出危险性预测中的应用[J]. 中国矿业大学学报，1993，22(4)：47-55.(LIN Baiquan，ZHOU Shining，ZHANGRengui. The stress relaxation zone in coal tuneling and its application to forecast of outburst danger[J].Journal of China University of Mining and Technology，1993，22(4)：47-55.(in Chinese))
[4]	赵志强. 大变形回采巷道围岩变形破坏机理与控制方法研究[博士学位论文][D]. 北京：中国矿业大学，2014.(ZHAO Zhiqiang. Mechanism of surrounding rock deformation and failure and control method research in large deformation mining roadway[Ph. D. Thesis][D]. Beijing：China University of Mining and Technology， 2014.(in Chinese))
[5]	ZHAI C，XU Y M，XIANG X W，et al. A novel active prevention technology for borehole instabilityunder the influence of mining activities[J]. Journal of Natural Gas Science and Engineering，2015，27：1 585-1 596.
[6]	赵志强，马念杰，郭晓菲，等. 煤层巷道蝶型冲击地压发生机理猜想[J]. 煤炭学报，2016，41(11)：2689-2697.(ZHAO Zhiqiang，MA Nianjie，GUO Xiaofei，et al. Mechanism conjecture of butterfly rock bust in coal seam roadway[J]. Journal of China Coal Society，2016，41(11)：2689-2697.(in Chinese))
[7]	马念杰，李季，赵志强. 圆形巷道围岩偏应力场及塑性区分布规律研究[J]. 中国矿业大学学报，2015，44(2)：206-213.(MA Nianjie，LI Ji，ZHAO Zhiqiang. Distribution of the deviatoric stress field and plastic zone in circular roadway surrounding rock[J]. Journal of China University of Mining and Technology，2015，44(2)：206-213.(in Chinese))
[1]	王振锋，周英，孙玉宁，等. 新型瓦斯抽采钻孔注浆封孔方法及封堵机理[J]. 煤炭学报，2015，40(3)：588-595.(WANG Zhenfeng，ZHOUYing，SUN Yuning，et al. Novel gas extraction borehole grouting sealing method and sealing mechanism[J]. Journal of China Coal Society，2015，40(3)：588-595.(in Chinese))
[2]	桑朋，杨磊，韩巍，等. “两堵一注”式顺层钻孔封孔技术研究与应用[J]. 中国煤炭，2014，40(3)：98-101.(SANG Peng，YANG Lei，HAN Wei，et al. Research on application of“two sealing and one grouting”sealing technique of boreholes drilled along seam[J]. China Coal，2014，40(3)：98-101.(in Chinese))
[8]	陈向军，段正鹏，刘洋，等. 负压环境下含瓦斯煤扩散特性试验研究[J]. 煤炭科学技术，2016，44(6)：106-110.(CHEN Xiangjun，DUAN Zhengpeng，LIU Yang，et al. Experiment study on diffusion features of gas coal under negative pressure environment[J].Coal Science and Technology，2016，44(6)：106-110.(in Chinese))