割缝数量影响下穿层瓦斯抽采钻孔注浆后裂隙扩展研究

doi:10.13722/j.cnki.jrme.2023.0053

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摘要为解决煤矿瓦斯抽采难题，提高瓦斯抽采钻孔封孔效果，探究瓦斯抽采钻孔注浆封孔后岩石注浆体受割缝影响的力学性质劣化及裂隙扩展规律，开展岩石注浆体的工业CT扫描及三轴压缩试验，全面分析割缝对岩石注浆体力学性质的劣化作用和岩石注浆体受载破坏后的裂隙扩展规律。研究结果表明：三轴应力条件下，岩石注浆体试样破坏后，二维裂隙率和分形维数随割缝数量线性增加，并在割缝位置附近达到峰值，这表明钻孔割缝对岩石注浆体的裂隙扩展具有导向作用，且割缝数量为1时试样裂隙分布范围最小；试样在受载破坏后三维裂隙率和分形维数随割缝数量线性增加，欧拉数则随割缝数量呈现出线性减小的趋势，这表明钻孔割缝会改善裂隙连通性，使得裂隙网络趋于复杂；同时，4种不同割缝数量的岩石注浆体试样的抗压强度随割缝数量的增加而减小，但其渗透率随割缝条数的增加而减小，综合考虑选取1～2条割缝较为合理，并经现场试验验证了割缝注浆封隔一体化技术的合理性。

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关键词 ：岩石力学, 岩石注浆体, 裂隙扩展, 工业CT扫描, 割缝注浆封孔技术, 穿层钻孔

Abstract：To address the problem of gas drainage in coal mines，improve the sealing effect of gas drainage boreholes and explore the mechanical property deterioration and crack expansion of rock grouting body affected by slit after the grouting sealing of gas drainage boreholes，industrial CT scanning and triaxial compression tests of rock grouting body were carried out to analyze the deterioration of the mechanical properties and the law of crack propagation caused by slitting after the failure of rock grouting bodies. The results show that the two-dimensional fracture rate and fractal dimension increase linearly with the number of slits and reach their peak values near the slitting position after the failure of rock grouting samples under the condition of triaxial stress. The drilling slits have a guiding effect on the fracture propagation of rock grouting bodies. In addition，the distribution range of cracks in samples is the smallest when the number of slits is 1. The three-dimensional fracture fraction and fractal dimension of samples increased linearly with the number of slits，while the Euler number decreased linearly with the number of slits. It shows that drilling and cutting could improve the fracture connectivity and make the fracture network more complicated. Additionally，the compressive strength of rock grouting samples with four different slit number decreases with the increase of slit number while the permeability of the samples decreases with the increase of slit number. It is reasonable to determine the number of slitting as 1–2. The rationality of the integrated technology of slotting grouting and sealing was verified.

Key words： rock mechanics rock grouting body rock expansion industrial CT scanning slitting-grouting-sealing technology boreholes of penetrating rock formations

引用本文:

王登科1，2，3，郭玉杰1，2，魏建平1，2，3，尚政杰4，王保国4，王岳栩4，. 割缝数量影响下穿层瓦斯抽采钻孔注浆后裂隙扩展研究[J]. 岩石力学与工程学报, 2024, 43(S1): 3296-3309.
WANG Dengke1，2，3，GUO Yujie1，2，WEI Jianping1，2，3，SHANG Zhengjie4，WANG Baoguo4，WANG Yuexu4，FU Jianhua1，2，DONG Bowen1，2，TANG Jiahao1，2. Study on crack propagation after gas drainage of grouting in boreholes of penetrating rock formations under the influence of slit number. , 2024, 43(S1): 3296-3309.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0053 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3296

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