Study on crack propagation after gas drainage of grouting in boreholes of penetrating rock formations under the influence of slit number
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
(1. State Key Laboratory Cultivation Base for Gas Geology and Gas Control，Henan Polytechnic University，Jiaozuo，Henan 454000，China；2. School of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China；3. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Jiaozuo，Henan 454000，China；4. Baiping Coal Industry Co.，Ltd. of Zhengzhou Coal Industry Group，Dengfeng，Henan 452482，China)
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.
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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2024, Vol. 43 
