浸水次数对煤样裂隙发育损伤的实验研究

doi:10.13722/j.cnki.jrme.2015.1720

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摘要由于地下水对隔水煤柱和地下水库边界的反复浸水损伤，研究反复浸水对煤样的裂隙损伤作用有助于解决中国西部干旱区半干旱区矿区井下储水以及含水层煤柱留设问题。通过自制浸水装置制取干燥，浸水1次，2次，3次，4次的煤样共5组，分别进行单轴压缩声发射实验。研究表明，煤样的峰值应力、弹性模量随着煤样浸水次数的增加而呈现不同程度的减小，但峰值应变随着浸水次数的增加而变大。刚度应力曲线结合声发射累计计数曲线能阐明裂隙发育的各个阶段，随着反复浸水次数增加，煤样裂隙的闭合应力阈值，裂隙初始发育阈值和裂隙损伤阈值均线性减小，但3个阈值占峰值强度的比值不随着浸水次数改变而变化，其比值分别为15.52%，31.04%和67.81%。实验结果对矿区地下水库建立和隔水煤岩体留设以及探究煤样裂隙发育规律具有指导意义。

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	陈田1
	姚强岭1
	杜茂2
	朱晨光3
	张博1

关键词 ：岩石力学, 矿井储水, 裂隙发育, 应力阈值, 裂隙损伤, 声发射

Abstract：Underground water has repeated intrusion on waterproof coal pillars and on underground reservoir boundaries. Therefore，researching the damaging effect of water intrusion times on crack propagation in coal gives meaningful advice to cope with problems，such as setting the width of water proof coal pillars and storing underground water in arid region of the West China. In this paper，coal samples were wetted by self-made humidifier and then were grouped into dry coal samples，coal samples under once water intrusion，twice water intrusion，third water intrusion and forth water intrusion. By acoustic emission testing，this research found the peak stress and elastic modulus decreased with the growth of water intrusion times but peak strain increased because of the rising water intrusion times. The stiffness-stress curve and accumulative AE counts combined with overall strain-stress curve could evaluate all phases of crack propagation. With the growing times of water intrusion，the stress thresholds of crack closure，crack initiation and crack damage declined linearly. Nevertheless，the percentage of three stress thresholds over peak stress did not vary with the change of water-intrusion times，with 15.52%，31.04% and 67.81% respectively. The experimental results can partly help set the width of waterproof coal pillars and of underground reservoir boundaries.

Key words： rock mechanics water storage in coal mine crack propagation stress thresholds crack damage acoustic emission

引用本文:

陈田1，姚强岭1，杜茂2，朱晨光3，张博1. 浸水次数对煤样裂隙发育损伤的实验研究[J]. 岩石力学与工程学报, 2016, 35(S2): 3756-3762.
CHEN Tian1，YAO Qiangling1，DU Mao2，ZHU Chenguang3，ZHANG Bo1. Experimental research of effect of water intrusion times on crack propagation in coal. , 2016, 35(S2): 3756-3762.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1720 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/3756

[1] 顾大钊. 煤矿地下水库理论框架和技术体系[J]. 煤炭学报，2015，40(2)：239–246.(GU Dazhao. Theory framework and technological system of coal mine underground reservoir[J]. Journal of China Coal Society，2015，40(2)：239–246.(in Chinese))

[2] 李旺林，束龙仓，殷宗泽. 地下水库的概念和设计理论[J]. 水利学报，2006，37(5)：613–618.(LI Wanglin，SU Longcang，YIN Zongze. Concept and design theory of groundwater reservoir[J]. Journal of Hydraulic Engineering，2006，37(5)：613–618.(in Chinese))

[3] YAO Q L，LI X H，ZHOU J，et al. Experimental study of strength characteristics of coal specimens after water intrusion[J]. Arabian Journal of Geosciences，2015，8(9)：6 779–6 789.

[4] HASHIBA K，FUKUI K. Effect of water on the deformation and failure of rock in uniaxial tension[J]. Rock Mechanics and Rock Engineering，2014，48(5)：1 751–1 761.

[5] MAHMUTOGLU Y. The effects of strain rate and saturation on a micro-cracked marble[J]. Engineering Geology，2006，82(3)：137–144.

[6] HOEK E，BIENAWSKI Z T. Brittle fracture propagation in rock under compression[J]. International Journal of Fracture Mechanics，1965，1：137–155.

[7] 彭俊，蔡明，荣冠，等. 裂纹闭合应力及其岩石微裂纹损伤评价[J]. 岩石力学与工程学报，2015，34(6)：1 091–1 100.(Stresses for crack closure and its application to assessing stress-induced microcrack damage[J] Chinese Journal of Rock Mechanics and Engineering，2015，34(6)：1 091–1 100.(in Chinese))

[8] RANJITH P G，JASINGE D，SONG J Y，et al. A study of the effect of displacement rate and moisture content on the mechanical properties of concrete：Use of acoustic emission[J]. Mechanics of Materials，2008，40(6)：453–469.

[9] EBERHARDT E，STEAD D，STIMPSON B，et al. Identifying crack initiation and propagation thresholds in brittle rock[J]. Canadian Geotechnical Journal，1998，35(2)：222–233.

[10] MENG F Z，ZHOU H，ZHANG C Q，et al. Evaluation methodology of brittleness of rock based on post-peak stress-strain curves[J]. Rock Mechanics and Rock Engineering，2014，48(5)：1 787–1 805.

[11] YU Z，ZHANG L，JIANG P，et al. Study on water-rock interactions of trace elements in groundwater with leaching experiments[J]. Ground Water，2015，53(Supp.1)：95–102.

[12] 申林方，冯夏庭，潘鹏志，等. 单裂隙花岗岩在应力–渗流–化学耦合作用下的试验研究[J]. 岩石力学与工程学报，2010，29(7)： 1 379–1 388.(SHEN Linfang，FENG Xiating，PAN Pengzhi，et al. Experimental research on mechano-hydro-chemical coupling of granite with single fracture[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(7)：1 379–1 388.(in Chinese))

[13] 王文，李化敏，顾合龙，等. 动静组合加载含水煤样能量耗散特征分析[J]. 岩石力学与工程学报，2015，34(2)：3 965–3 971. (WANG Wen，LI Huamin，GU Helong，et al. Feature analysis of energy dissipation of water-saturated coal samples under coupled static-dynamic loads[J] Chinese Journal of Rock Mechanics and Engineering，2015，34(2)：3 965–3 971.(in Chinese))

[14] MEHDI G，ALI F. Size effect material ductility and shape of fracture process zone in quasi-brittle materials[J]. Computers and Geotechnics，2015，65：126–135.

[15] HUANG B，LIU J. The effect of loading rate on the behavior of samples composed of coal and rock[J]. International Journal of Rock Mechanics and Mining Sciences，2013，61：23–30.

[16] LI H M，LI H G，GAO B B，et al. Study of acoustic emission and mechanical characteristics of coal samples under different loading rates[J]. Shock and Vibration，2015，Article ID 458519：1–11.

[17] 尤明庆. 岩石试样的杨氏模量与围压的关系[J]. 岩石力学与工程学报，2003，22(1)：53–60.(YOU Mingqing. Effect of confining pressure on the Young¢s modulus of rock specimen[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(1)：53–60.(in Chinese))