循环荷载下深部卸荷煤体力学特性及能量演化规律研究

doi:10.13722/j.cnki.jrme.2023.1159

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Abstract In order to explore the mechanical properties and energy evolution law of unloading coal under cyclic loading，the MTS816 rock mechanics test system was used to carry out triaxial cyclic loading tests with variable lower limit and constant lower limit of coal samples. The relationship between mechanical parameters of coal samples was analyzed by obtaining the whole process stress-strain curve，and the energy evolution law of coal samples during cycle loading process was studied based on the energy principle. The results show that：(1) Compared with the CG group，the peak stress increment extreme value of the coal samples under cyclic loading is 3.540 MPa，and the overall change is not large. The axial strain and lateral strain of the XH1 and XH2 groups are positively correlated and negatively correlated with the confining pressure，respectively. The volumetric strain of the XH1 group increases first and then stabilized and then increased，while that of the XH2 group increased first and then decreased and then increased. (2) The loading modulus of coal samples under cyclic loading is positively correlated with the number of cycles and negatively correlated with the stress level. Both the strain hardening modulus and the drop modulus are negatively correlated with the confining pressure. The high confining pressure condition weakens the ability to resist the inelastic model，and this weakening trend is independent of the stress path. The cyclic stress path has a significant effect on the deformation characteristics of coal samples. (3) The energy density of coal samples is higher under the action of constant lower limit path or high confining pressure. The dissipation energy density of coal samples in each cycle level is basically consistent with the input energy density，showing a trend of decreasing first and then stabilizing，and the elastic energy density is generally stable. (4) Under cyclic loading，the elastic energy density of coal samples accounts for more than 89.11% of the total input energy density，and the mean value of the two is linear. The total energy is mainly stored in the form of elastic energy，and this storage capacity is independent of confining pressure. The average value of dissipated energy density and elastic energy density changes in a power function type，and the energy competition ability of dissipated energy gradually increases with the increase of cyclic stress level.

Key words： rock mechanics coal cyclic loading mechanical properties energy evolution

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	WANG Lei
	ZOU Peng
	FAN Hao
	XIE Guangxiang
	JIN Kang
	ZHONG Hao

Cite this article:

WANG Lei,ZOU Peng,FAN Hao, et al. Study on mechanical properties and energy evolution of deep unloading coal under cyclic loading[J]. , 2024, 43(10): 2341-2355.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1159 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2341

[1]	姜耀东，潘一山，姜福兴，等. 我国煤炭开采中的冲击地压机制和防治[J]. 煤炭学报，2014，39(2)：205-213.(JIANG Yaodong，PAN Yishan，JIANG Fuxing，et al. State of the art review on mechanism and prevention of coal bumps in China[J]. Journal of China Coal Society，2014，39(2)：205-213.(in Chinese))
[2]	袁亮. 深部采动响应与灾害防控研究进展[J]. 煤炭学报，2021，46(3)：716-725.(YUAN Liang. Research progress of mining response and disaster prevention and control in deep coal mines[J]. Journal of China Coal Society，2021，46(3)：716-725.(in Chinese))
[3]	SHU L，YUAN L，LI Q，et al. Response characteristics of gas pressure under simultaneous static and dynamic load：Implication for coal and gas outburst mechanism[J]. International Journal of Mining Science and Technology，2023，33(2)：155-171.
[4]	杨永杰，宋扬，楚俊. 循环荷载作用下煤岩强度及变形特征试验研究[J]. 岩石力学与工程学报，2007，26(1)：201-205.(YANG Yongjie，SONG Yang，CHU Jun. Experimental study on characteristics of strength and deformation of coal under cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(1)：201-205.(in Chinese))
[5]	张英，苗胜军，郭奇峰，等. 循环荷载下花岗岩应力门槛值的细观能量演化及岩爆倾向性[J]. 工程科学学报，2019，41(7)：864-873.(ZHANG Ying，MIAO Shengjun，GUO Qifeng，et al. Mesoenergy evolution and rock burst proneness of the stress thresholds of granite under triaxial cyclic loading and unloading test[J]. Chinese Journal of Engineering，2019，41(7)：864-873.(in Chinese))
[6]	LIANG Y，RAN Q，ZOU Q，et al. Experimental study of mechanical behaviors and failure characteristics of coal under true triaxial cyclic loading and unloading and stress rotation[J]. Natural Resources Research，2022，31(2)：971-991.
[7]	彭瑞东，鞠杨，高峰，等. 三轴循环加卸载下煤岩损伤的能量机制分析[J]. 煤炭学报，2014，39(2)：245-252.(PENG Ruidong，JU Yang，GAO Feng，et al. Energy analysis on damage of coal under cyclical triaxial loading and unloading conditions[J]. Journal of China Coal Society，2014，39(2)：245-252.(in Chinese))
[8]	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 and Safety Engineering，2014，31(3)：456-461.(in Chinese))
[9]	JIANG J，ZHANG Y，DENG Z，et al. Experimental study on mechanical behavior and energy evolution characteristics of gas-filled deep coal under cyclic loading[J]. Processes，2023，11(2)：316.
[10]	ZHANG A，XIE H，ZHANG R，et al. Mechanical properties and energy characteristics of coal at different depths under cyclic triaxial loading and unloading[J]. International Journal of Rock Mechanics and Mining Sciences，2023，161：105271.
[11]	李涛，马永君，刘波，等. 循环荷载作用下冻结灰砂岩强度特征与弹性模量演化规律[J]. 煤炭学报，2018，43(9)：2 438-2 443.(LI Tao，MA Yongjun，LIU Bo，et al. Strength characteristics and elastic modulus evolution of frozen gray sandstone under cyclic loading[J]. Journal of China Coal Society，2018，43(9)：2 438-2 443.(in Chinese))
[12]	马林建，刘新宇，许宏发，等. 循环荷载作用下盐岩三轴变形和强度特性试验研究[J]. 岩石力学与工程学报，2013，32(4)：849-856. (MA Linjian，LIU Xinyu，XU Hongfa，et al. Deformation and strength properties of rock salt subjected to triaxial compression with cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(4)：849-856.(in Chinese))
[13]	赵军，郭广涛，徐鼎平，等. 三轴及循环加卸载应力路径下深埋硬岩变形破坏特征试验研究[J]. 岩土力学，2020，41(5)：1 521-1 530. (ZHAO Jun，GUO Guangtao，XU Dingping，et al. Experimental study of deformation and failure characteristics of deeply-buried hard rock under triaxial and cyclic loading and unloading stress paths[J]. Rock and Soil Mechanics，2020，41(5)：1 521-1 530.(in Chinese))
[14]	张培森，许大强，张睿，等. 不同围压及循环载荷下砂岩的渗流、力学特性试验研究[J]. 岩石力学与工程学报，2022，41(12)：2 432-2 450.(ZHANG Peisen，XU Daqiang，ZHANG Rui，et al. Experimental study on seepage and mechanical properties of sandstone under different confining pressures and cyclic loads[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(12)：2 432-2 450.(in Chinese))
[15]	谢和平，彭瑞东，鞠杨. 岩石变形破坏过程中的能量耗散分析[J]. 岩石力学与工程学报，2004，23(21)：3 565-3 570.(XIE Heping，PENG Ruidong，JU Yang，et al. Energy dissipation of rock deformation and fracture[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(21)：3 565-3 570.(in Chinese))
[16]	谢和平，鞠杨，黎立云. 基于能量耗散与释放原理的岩石强度与整体破坏准则[J]. 岩石力学与工程学报，2005，24(17)：3 003- 3 010.(XIE Heping，JU Yang，LI Liyun，et al. Criteria for strength and structural failure of rocks based on energy dissipation and energy release principles[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(17)：3 003-3 010.(in Chinese))
[17]	LIU X S，NING J G，TAN Y L，et al. Damage constitutive model based on energy dissipation for intact rock subjected to cyclic loading[J]. International Journal of Rock Mechanics and Mining Sciences，2016，85：27-32.
[18]	李子运，吴光，黄天柱，等. 三轴循环荷载作用下页岩能量演化规律及强度失效判据研究[J]. 岩石力学与工程学报，2018，37(3)：662-670.(LI Ziyun，WU Guang，HUANG Tianzhu，et al. Research on evolution law of energy and criteria for strength failure of shale under traixial cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(3)：662-670.(in Chinese))
[19]	刘汉香，别鹏飞，李欣，等. 三轴多级循环加卸载下千枚岩的力学特性及能量耗散特征研究[J]. 岩土力学，2022，43(增2)：265-274.(LU Hanxiang，BIE Pengfei，LI Xin，et al. Mechanical properties and energy dissipation characteristics of phyllite under triaxial multi-stage cyclic loading and unloading conditions[J]. Rock and Soil Mechanics，2022，43(Supp.2)：265-274.(in Chinese))
[20]	苗胜军，刘泽京，赵星光，等. 循环荷载下北山花岗岩能量耗散与损伤特征[J]. 岩石力学与工程学报，2021，40(5)：928-938.(MIAO Shengjun，LIU Zejing，ZHAO Xingguang，et al. Characteristics of energy dissipation and damage of Beishan granite under cyclic loading and unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(5)：928-938.(in Chinese))
[21]	王向宇，周宏伟，钟江城，等. 三轴循环加卸载下深部煤体损伤的能量演化和渗透特性研究[J]. 岩石力学与工程学报，2018，37(12)：2 676-2 684.(WANG Xiangyu，ZHOU Hongwei，ZHONG Jiangcheng，et al. Study on energy evolution and permeability characteristics of deep coal damage under triaxial cyclic loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(12)：2 676-2 684.(in Chinese))
[22]	孟庆彬，王从凯，黄炳香，等. 三轴循环加卸载条件下岩石能量演化及分配规律[J]. 岩石力学与工程学报，2020，39(10)：2 047-2 059. (MENG Qingbin，WANG Congkai，HUANG Bingxiang，et al. Rock energy evolution and distribution law under triaxial cyclic loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(10)：2 047-2 059.(in Chinese))
[23]	ZHANG A，XIE H，ZHANG R，et al. Mechanical properties and energy characteristics of coal at different depths under cyclic triaxial loading and unloading[J]. International Journal of Rock Mechanics and Mining Sciences，2023，161：105271.
[24]	PENG K，SHI S，ZOU Q，et al. Quantitative characteristics of energy evolution of gas-bearing coal under cyclic loading and its action mechanisms on coal and gas outburst[J]. Rock Mechanics and Rock Engineering，2021，54：3 115-3 133.
[25]	ULUSAY R. The present and future of rock testing: highlighting the ISRM suggested methods[C]// The ISRM Suggested Methods for Rock Characterization，Testing and Monitoring：2007—2014. [S. l.]：Springer International Publishing，2015：1-22.
[26]	谢和平，高明忠，付成行，等. 深部不同深度岩石脆延转化力学行为研究[J]. 煤炭学报，2021，46(3)：701-715.(XIE Heping，GAO Mingzhong，FU Chenghang，et al. The mechanical behavior of brittle-ductile transition in rocks at different depths[J]. Journal of China Coal Society，2021，46(3)：701-715.(in Chinese))
[27]	王磊，邹鹏，谢广祥，等. 深部原位应力煤岩卸荷力学特性试验研究[J]. 岩石力学与工程学报，2023，42(12)：2 879-2 887.(WANG Lei，ZOU Peng，XIE Guangxiang，et al. Experimental study on unloading mechanical properties of deep coal under in-situ stress [J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(12)：2 879-2 887.(in Chinese))
[28]	谢和平，鞠杨，黎立云，等. 岩体变形破坏过程的能量机制[J]. 岩石力学与工程学报，2008，27(9)：1 729-1 740.(XIE Heping，JU Yang，LI Liyun，et al. Energy mechanism of deformation and failure of rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(9)：1 729-1 740.(in Chinese))
[29]	GONG F，YAN J，LUO S，et al. Investigation on the linear energy storage and dissipation laws of rock materials under uniaxial compression[J]. Rock Mechanics and Rock Engineering，2019，52：4 237-4 255.
[30]	GONG F，WANG Y，WANG Z，et al. A new criterion of coal burst proneness based on the residual elastic energy index[J]. International Journal of Mining Science and Technology，2021，31(4)：553-563.