软硬复合煤层厚度比对卸荷破坏的控制作用
Control effect of thickness ratio of soft and hard composite coal seam on unloading failure
-
Abstract: In the engineering practices of coal seam mining and gas drainage, the unloading damage of soft and hard composite coal seam is a common problem faced by surrounding rock support and coal seam enhancement. In order to explore the mechanical properties of the composite coal seam during the unloading process and the energy evolution law during the failure process, based on the energy dissipation equation and the coal rock damage model, we applied PFC numerical simulation and laboratory tests, and studied the deformation and failure modes of coal, mechanical properties and energy dissipation and acoustic emission laws of Xintian coal body under the layered thickness; finally, the control law of unloading failure of 4# soft and hard composite coal seam thickness ratio in Xintian Coal Mine is obtained and verified by hydraulic punching on site. The results show that: under triaxial compression, the effect of different thickness ratios on the deformation and failure modes of the composite coal body can be seen in the transference of the fracture zone, the stress-strain curve of the composite coal body taking the thickness ratio of 0.45 （soft layer thickness/composite coal seam thickness） as the dividing point causes a “stepped” smooth and violent change, which is related to the size of the confining pressure; the essence of the unloading failure of the composite coal body is the fracture of the bonding bonds between the particles. What’s more, the size and the breaking of the cohesive bonds between the coal particles have a positive effect. The results of in-situ hydraulic punching are consistent with the simulation results.
-
-
[1] 孙玲, 宫立昊.2019年国内煤矿安全事故统计分析及对策研究[J].决策探索(中), 2020(2): 20-21. [2] 兰天伟, 张宏伟, 韩军, 等.基于应力及能量条件的岩爆发生机理研究[J].采矿与安全工程学报, 2012, 29(6): 840-844. LAN Tianwei, ZHANG Hongwei, HAN Jun, et al. Study on rock burst mechanism based on geo-stress and energy principle[J]. Journal of Mining & Safety Engineering, 2012, 29(6): 840-844.
[3] 陈宇龙, 魏作安, 许江, 等.单轴压缩条件下岩石声发射特性的实验研究[J].煤炭学报, 2011, 36(S2): 237-240. CHEN Yulong, WEI Zuoan, XU Jiang, et al. Experimental research on the acoustic emission characteristics ofrock under uniaxial compression[J]. Journal of China Coal Society, 2011, 36(S2): 237-240.
[4] 张宇宁, 陈宇龙.单轴压缩下高含石量胶凝堆石料的力学特性[J].东北大学学报(自然科学版), 2016, 37(11): 1630-1634. ZHANG Yuning, CHEN Yulong. Mechanical characteristics of cemented rockfill materials with high rock block proportions under uniaxial compression[J]. Journal of Northeastern University (Natural Science), 2016, 37(11): 1630-1634.
[5] 任非.三轴压缩条件下煤岩力学特性及破坏模式[J].煤矿安全, 2018, 49(1): 37-39. REN Fei. Mechanical properties and failure modes of coal and rock under triaxial compression[J]. Safety in Coal Mines, 2018, 49(1): 37-39.
[6] 郭东明.湖西矿井深部煤岩组合体宏细观破坏试验与理论研究[D].北京: 中国矿业大学(北京), 2010. [7] ZHAO Z, WANG W, WANG L. Theoretical analysis of a new segmented anchoring style in weakly cemented soft surrounding rock[J]. International Journal of Mining Science and Technology, 2016, 26(3): 401-407. [8] ZHAO Zenghui, WANG Weiming, DAI Chunquan, et al. Failure characteristics of three-body model composed of rock and coal with different strength and stiffness[J]. Transactions of Nonferrous Metals Society of China, 2014, 24(5): 1538-1546. [9] 李昂, 朱瑞虎, 葛治宏, 等.基于损伤过程的非均质岩体声发射及破坏规律数值模拟研究[J].地质学刊, 2019, 43(4): 606-611. LI Ang, ZHU Ruihu, GE Zhihong, et al. Numerical study of acoustic emission and failure characteristics of inhomogeneityrock mass based on damage process[J]. Journal of Geology, 2019, 43(4): 606-611.
[10] 刘飞, 梁道富, 刘建林, 等.碎软煤层空气复合定向钻进工艺技术[J].煤矿安全, 2019, 50(7): 116-119. LIU Fei, LIANG Daofu, LIU Jianlin, et al. Air compound directional drilling technology in broken soft seam[J]. Safety in Coal Mines, 2019, 50(7): 116-119.
[11] ZUO J, WANG Z, ZHOU H, et al. Failure behavior of a rock-coal-rock combined body with a weak coal interlayer[J]. International Journal of Mining Science and Technology, 2013, 23(6): 907-912. [12] 王明旭.胶结充填体与围岩相互作用机理及变形演化规律研究[D].武汉: 武汉科技大学, 2018. [13] 王明旭, 许梦国, 胡兴浪, 等.接顶对充填体-围岩相互作用影响的声发射监测试验[J].有色金属工程, 2018, 8(5): 72-76. WANG Mingxu, XU Mengguo, HU Xinglang, et al. Acoustic emission monitoring test for the effect of top filling on filling body-surrounding rock[J]. Nonferrous Metal Engineering, 2018, 8(5): 72-76.
[14] 王明旭.围岩与早期强度阶段充填体耦合作用的模拟试验研究[J].武汉科技大学学报, 2019, 42(2): 129-134. WANG Mingxu. Simulation experiment of coupling effect between surrounding rock and filling body in early strength stage[J]. Journal of Wuhan University of Science and Technology, 2019, 42(2): 129-134.
[15] 杨永杰, 马德鹏.煤样三轴卸荷破坏的能量演化特征试验分析[J].采矿与安全工程学报, 2018, 35(6): 1208-1216. YANG Yongjie, MA Depeng. Experimental research on energy evolution properties of coal sample failure under triaxial unloading testing[J]. Journal of Mining & Safety Engineering, 2018, 35(6): 1208-1216.
[16] 苏承东, 熊祖强, 翟新献, 等.三轴循环加卸载作用下煤样变形及强度特征分析[J].采矿与安全工程学报, 2014, 31(3): 456-461. SU Chengdong, XIONG Zuqiang, ZHAI Xinxian, et al. Analysis of deformation and strength characteristics of coal samples under the triaxial cyclic loading and unloading stress path[J]. Journal of Mining & Safety Engineering, 2014, 31(3): 456-461.
[17] 苏承东, 翟新献, 李宝富, 等.砂岩单三轴压缩过程中声发射特征的试验研究[J].采矿与安全工程学报, 2011, 28(2): 225-230. SU Chengdong, ZHAI Xinxian, LI Baofu, et al. Experimental study of the characteristics ofacoustic emission for sandstone specimens under uniaxialand triaxial compression tests[J]. Journal of Mining & Safety Engineering, 2011, 28(2): 225-230.
[18] 殷鹏飞.层状复合岩石试样力学特性单轴压缩试验与颗粒流模拟研究[D].徐州: 中国矿业大学, 2016. [19] 殷鹏飞, 杨圣奇, 曾卫.含单裂隙复合岩层强度与裂纹扩展特征模拟研究[J].应用基础与工程科学学报, 2015, 23(3): 608-621. YIN Pengfei, YANG Shengqi, ZENG Wei. A simulation study on strength and crack propagationcharacteristics of layered composite rock with single fissure[J]. Journal of Basic Science and Engineering, 2015, 23(3): 608-621.
[20] 程建龙, 杨圣奇, 殷鹏飞, 等.复合岩层变形及强度特性卸围压试验研究[J].中国矿业大学学报, 2018, 47(6): 1233-1242. CHENG Jianlong, YANG Shengqi, YIN Pengfei, et al. Experimental study of the deformation and strength behavior of composite rock specimens in unloading confining pressure test[J]. Journal of China University of Mining & Technology, 2018, 47(6): 1233-1242.
[21] 田文岭, 杨圣奇, 殷鹏飞.张开与充填四裂隙脆性砂岩强度和贯通模式研究[J].应用基础与工程科学学报, 2018, 26(5): 1005-1015. TIAN Wenling, YANG Shengqi, YIN Pengfei. Strength and crack coalescence behavior of sandstonecontaining four filled or unfilled pre-existing fissures[J]. Journal of Basic Science and Engineering, 2018, 26(5): 1005-1015.
[22] 张荣.复合煤层水力冲孔卸压增透机制及高效瓦斯抽采方法研究[D].徐州: 中国矿业大学, 2019. [23] 李龙飞.基于离散元的软硬复合煤层高压水射流损伤增透机制与应用[D].徐州: 中国矿业大学, 2021. [24] 吴绵拔.加载速率对岩石抗压和抗拉强度的影响[J].岩土工程学报, 1982, 4(2): 97-106. WU Mianba. The effect of loading rate on the compressive and tensile strength of rocks[J]. Chinese Journal of Geotechnical Engineering, 1982, 4(2): 97-106.
[25] 李鑫, 李昊, 杨桢, 等.基于FLAC3D的复合煤岩卸荷破裂数值模拟[J].安全与环境学报, 2020, 20(6): 2187-2195. LI Xin, LI Hao, YANG Zhen, et al. Numerical simulation case study by using FLAC3D of the composite coal-rock on the load-free fracture[J]. Journal of Safety and Environment, 2020, 20(6): 2187-2195.
[26] HEIPLE C R, CARPENTER S H. Acoustic emission produced by the delta-to-alpha phase transformation in Pu-Ga alloys[J]. Metallurgical Transactions. A, Physical Metallurgy and Materials Science, 1992, 23(3): 779-783. -
期刊类型引用(2)
1. 桑树勋，皇凡生，单衍胜，周效志，刘世奇，韩思杰，郑司建，刘统，王梓良，王峰斌. 碎软低渗煤储层强化与煤层气地面开发技术进展. 煤炭科学技术. 2024(01): 196-210 . 
百度学术
2. 陈学雷，冉庆雷. 构造煤的常规三轴试验仿真参数敏感度分析研究. 能源与环保. 2024(08): 6-13+21 . 百度学术
其他类型引用(0)
计量
- 文章访问数: 32
- HTML全文浏览量: 24
- PDF下载量: 18
- 被引次数: 2
下载:
