| 水平裂缝对坚硬顶板失稳破断的影响规律研究 |
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| 引用本文： | 王海洋,周宴民,孙凯,夏彬伟,李寿龙,刘成武.水平裂缝对坚硬顶板失稳破断的影响规律研究[J].中国煤炭,2020(4):77-82. |
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| 作者姓名： | 王海洋 周宴民 孙凯 夏彬伟 李寿龙 刘成武 |
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| 作者单位： | 重庆交通大学土木工程学院;山东省煤炭泰山疗养院;重庆大学煤矿灾害动力学与控制国家重点实验室;安徽省职业病防治院职业卫生技术服务中心;陕西煤业化工集团孙家岔龙华矿业有限公司 |
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| 基金项目： | 国家自然科学基金项目(51804058);重庆市教委科学技术研究项目(KJQN201800729);重庆交通大学校内科学基金项目(18JDKJC-B005)。 |
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| 摘 要： | 为了研究水力压裂形成水平裂缝后坚硬顶板的失稳破断规律,基于材料力学和关键层相关理论,结合数值模拟,对含水平裂缝坚硬顶板的变形破坏特征和失稳破断机制进行了研究。结果表明:当坚硬顶板存在水平贯穿裂缝时,无论上位与下位岩层是否发生同步运动,坚硬顶板的破断步距均小于其初始极限跨距。存在水平贯穿裂缝的坚硬顶板及其上覆岩层,会形成拉压复合破坏区,更易于发生失稳破坏。坚硬顶板块体咬合点区域的拉压复合破坏作用是造成块体局部失稳、回转加剧和整体破断的主要原因。
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| 关 键 词： | 水力压裂 坚硬顶板 水平贯穿裂缝 破断步距 裂缝面 |
Study on the influence law of horizontal crack on the instability and breaking of hard roof |
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| Wang Haiyang,Zhou Yanmin,Sun Kai,Xia Binwei,Li Shoulong,Liu Chengwu.Study on the influence law of horizontal crack on the instability and breaking of hard roof[J].China Coal,2020(4):77-82. |
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| Authors: | Wang Haiyang Zhou Yanmin Sun Kai Xia Binwei Li Shoulong Liu Chengwu |
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| Affiliation: | (School of Civil Engineering, Chongqing Jiaotong University, Nan'an, Chongqing 400074, China;Shandong Taishan Coal Sanatorium, Taian, Shandong 271000, China;State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Shapingba, Chongqing 400030, China;Occupational Health Technical Service Center, Anhui Occupational Disease Prevention Hospital, Hefei, Anhui 230022, China;Sunjiacha Longhua Mining Industry Co., Ltd., Shaanxi Coal and Chemical Industry Group, Yulin, Shaanxi 719314, China) |
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| Abstract: | To study the instability and breaking laws of hard roof with horizontal penetrating crack formed by hydraulic fracturing,the characteristics of transformation and failure and the mechanism of instability and breaking of hard roof with horizontal penetrating crack were studied based on the theories of material mechanics and key strata and combined with numerical simulation.The results showed that when there was horizontal penetrating crack in the hard roof,whether the upper and the lower strata moved synchronously or not,the breaking span of hard roof was shorter than its initial limited span.A tension-compression destructive zone formed in the hard roof with horizontal penetrating crack and its overlying strata was more likely to cause roof failure.The tension-compression destructive effect in the biting point area of hard roof blocks was the main reason of local buckling,gyration intensification and roof breaking. |
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| Keywords: | hydraulic fracturing hard roof horizontal penetrating crack breaking span crack face |
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