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。
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.
作者
王登科
郭玉杰
魏建平
尚政杰
王保国
王岳栩
付建华
董博文
唐家豪
WANG Dengke;GUO Yujie;WEI Jianping;SHANG Zhengjie;WANG Baoguo;WANG Yuexu;FU Jianhua;DONG Bowen;TANG Jiahao(State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo,Henan 454000,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo,Henan 454000,China;Baiping Coal Industry Co.,Ltd.of Zhengzhou Coal Industry Group,Dengfeng,Henan 452482,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2024年第S01期3296-3309,共14页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(52174174)
河南省高等学校重点科研项目计划基础研究专项(21zx004)
河南理工大学创团队计划(T2022-1)
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
rock mechanics
rock grouting body
rock expansion
industrial CT scanning
slitting-grouting-sealing technology
boreholes of penetrating rock formations
作者简介
王登科(1980-),男,2003年毕业于湖南科技大学采矿工程专业,现任教授、博士生导师,主要从事安全科学与工程方面的研究工作。E-mail:wdk@hpu.edu.cn
