低刚度加载诱发煤样冲击破坏特征及其机制

doi:10.13722/j.cnki.jrme.2023.1038

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (4362 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In order to study the mechanical properties and failure characteristics of the coal-rock combination with different stiffness ratios，coal samples and rock samples with different elastic modulus were combined to construct composite coal-rock samples for tests. Uniaxial compressive tests were carried out to evaluate the response of the combined samples including the macro and micro failure characteristics. The debris of coal samples was collected after test to quantify the spacial and scale distribution characteristics. The ejection process of the debris during failure was recorded using a high-speed camera and then used to analyze the ejection parameters such as the volume，velocity，momentum and kinetic energy of the debris which were then used to quantitatively evaluate the damage intensity of coal samples with different stiffness ratio combinations. The deformation characteristics of the loading process are obtained by using the strain gauge pasted on the surface of the sample，and the energy evolution is calculated by combining the load data recorded by the testing machine. The impact failure mechanism of the middling coal sample of the combined sample is analyzed from the energy perspective. The research findings are as follows：(1) Impact failure occurs to middling coal samples of combined samples，and the rock is compressed during the loading stage to accumulate elastic strain energy. When the coal sample is damaged，more than 90% of the accumulated energy releases to work on the coal sample with the rebound deformation of the rock，leading to the impact failure of the coal sample. (2) The axial deformation of composite specimens is a comprehensive deformation of rock and coal samples. The axial deformation of coal samples is relatively constant at peak strength，and the difference in axial deformation of composite specimens under different combination modes mainly depends on the rock. The axial strain of rock at peak strength decreases with the increase of elastic modulus. (3) As the elastic modulus of the rock decreases，the pre peak deformation increases in an inverse proportional function，the accumulation of elastic strain energy increases，and the post peak energy release rapidly increases，leading to a nonlinear intensification of the coal sample failure intensity as the elastic modulus of the rock decreases. (4) The nonlinear characteristics of parameters such as axial strain of rock at peak strength and failure intensity of coal samples with respect to the evolution of rock elastic modulus in composite samples are prominent：when the elastic modulus of rock and coal samples is at the same level，the response of each parameter to the change of rock elastic modulus is significant；When the elastic modulus of rocks is significantly higher than that of coal samples，the response of various parameters to the elastic modulus of rocks weakens.

Key words： rock mechanics composite coal-rock sample impact failure mechanical property deformation characteristics energy evolution destructive intensity

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LU Zhiguo1
	2
	GAO Fuqiang1
	2
	3
	JU Wenjun1
	2
	3
	LOU Jinfu1
	2
	3
	BAI Gang4
	DONG Shuangyong1
	2
	SUN Zhuoyue1
	2
	YANG Lei1
	2
	LI Jianzhong1
	2

Cite this article:

LU Zhiguo1,2,GAO Fuqiang1, et al. Characteristics and mechanism of coal sample impact failure induced by low stiffness loading[J]. , 2024, 43(6): 1455-1467.

URL:

http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1038 OR http://rockmech.whrsm.ac.cn/EN/Y2024/V43/I6/1455

[2]	夏永学，潘俊锋，谢非，等. 特厚煤层大巷复合构造区重复冲击致灾机制及控制技术[J]. 岩石力学与工程学报，2022，41(11)：2 199-2 209.(XIA Yongxue，PAN Junfeng，XIE Fei，et al. I Disaster mechanism and control technology of large roadway group with repeated impact in extra-thick coal seam[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(11)：2 199-2 209.(in Chinese))
[4]	LIU C L，TAN Z X，DENG K Z，et al. Synergistic instability of coal pillar and roof system and filling method based on plate model[J]. International Journal of Mining Science and Technology，2013，23(1)：145-149.
[6]	CHEN Y，ZUO J P，LIU D J，et al. Deformation failure characteristics of coal-rock combined body under uniaxial compression：experimental and numerical investigations[J]. Bulletin of Engineering Geology and the Environment，2018，78(5)：3 449-3 464.
[7]	DAI C Q，WANG L H，ZHAO Z H，et al. Compression-shear strength criterion of coal-rock combination model considering interface effect[J]. Tunnelling and Underground Space Technology，2015，47：193-199.
[9]	SEIDEL J P，HABERFIELD C M. A theoretical model for rock joints subjected to constant normal stiffness direct shear[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(5)：539-553.
[10]	杨磊，高富强，王晓卿，等. 煤岩组合体的能量演化规律与破坏机制[J]．煤炭学报，2019，44(12)：3 894-3 902.(YANG Lei，GAO Fuqiang，WANG Xiaoqing，et al. Energy evolution law and failure mechanism of coal-rock combined specimen[J]. Journal of China Coal Society，2019，44(12)：3 894-3 902.(in Chinese))
[12]	LU Z G，JU W J，GAO F Q，et al. Influence of loading rate on the failure characteristics of composite coal-rock specimens under quasi-static loading conditions[J]. Rock Mechanics and Rock Engineering，2022，55(2)：909-921.
[14]	左建平，谢和平，吴爱民，等．深部煤岩单体及组合体的破坏机制与力学特性研究[J]. 岩石力学与工程学报，2011，30(1)：84-92.(ZUO Jianping，XIE Heping，WU Aimin，et al. Investigation on failure mechanisms and mechanical behaviors of deep coal-rock single body and combined body[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(1)：84-92.(in Chinese))
[1]	CHEN S J，GUO W J，ZHOU H，et al. Field investigation of long-term bearing capacity of strip coal pillars[J]. International Journal of Rock Mechanics and Mining Sciences，2014，70(9)：109-114.
[8]	PETUKHOV I M，LINKOV A M. The theory of post-failure deformations and the problem of stability in rock mechanics[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1979，16(2)：57-76.
[17]	HUANG B X，LIU J W. The effect of loading rate on the behavior of samples composed of coal and rock[J]. International Journal of Rock Mechanics and Mining Sciences，2013，61：23-30.
[18]	张泽天，刘建锋，王璐，等. 组合方式对煤岩组合体力学特性和破坏特征影响的试验研究[J]. 煤炭学报，2012，37(10)：1 677-1 681. (ZHANG Zetian，LIU Jianfeng，WANG Lu，et al. Effects of combination mode on mechanical properties and failure characteristics of the coal-rock combinations[J]. Journal of China Coal Society，2012，37(10)：1 677-1 681.(in Chinese))
[20]	左建平，陈岩，崔凡. 不同煤岩组合体力学特性差异及冲击倾向性分析[J]. 中国矿业大学学报，2018，47(1)：81-87.(ZUO Jianping，CHEN Yan，CUI Fan. Investigation on mechanical properties and rock burst tendency of different coal-rock combined bodies[J]. Journal of China University of Mining and Technology，2018，47(1)：81-87.(in Chinese))
[22]	陈光波，李谭，杨磊，等．不同煤岩比例及组合方式的组合体力学特性及破坏机制[J]. 采矿与岩层控制工程学报，2021，3(2)：84-94.(CHEN Guangbo，LI Tan，YANG Lei，et al. Mechanical properties and failure mechanism of combined bodies with different coal-rock ratios and combinations[J]. Journal of Mining and Strata Control Engineering，2021，3(2)：84-94.(in Chinese))
[24]	ZHAO T B，GUO W Y，LU C P，et al. Failure characteristics of combined coal-rock with different interfacial angles[J]. Geomechanics and Engineering，2016，11(3)：345-359.
[27]	郭东明，左建平，张毅，等. 不同倾角组合煤岩体的强度与破坏机制研究[J]．岩土力学，2011，32(5)：1 333-1 339.(GUO Dongming，ZUO Jianping，ZHANG Yi，et al. Research on strength and failure mechanism of deep coal-rock combination bodies of different inclined angles[J]. Rock and Soil Mechanics，2011，32(5)：1 333-1 339.(in Chinese))
[28]	杨磊，高富强，王晓卿. 不同强度比组合煤岩的力学响应与能量分区演化规律[J]. 岩石力学与工程学报，2020，39(增2)：3 297-3 305. (YANG Lei，GAO Fuqiang，WANG Xiaoqing. Mechanical response and energy partition evolution of coal-rock combinations with different strength ratios[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(Supp. 2)：3 297-3 305.(in Chinese))
[30]	牟宗龙，王浩，彭蓬，等. 岩-煤-岩组合体破坏特征及冲击倾向性试验研究[J]. 采矿与安全工程学报，2013，30(6)：841-847.(MU Zonglong，WANG Hao，PENG Peng，et al. Experimental research on failure characteristics and bursting liability of rock-coal-rock sample[J]. Journal of Mining and Safety Engineering，2013，30(6)：841-847.(in Chinese))
[32]	GAO F，KANG H，YANG L. An experimental investigation into the strainburst process under quasi-static loading[J]. Rock Mechanics and Rock Engineering，2020，53：5 617-5 629.
[34]	高欢，翟越，汪铁楠，等. 主动围压作用下混凝土-花岗岩组合体抗压力学特性与强度预测模型研究[J]. 岩土力学，2022，43(11)：2 984-2 994.(GAO Huan，ZHAI Yue，WANG Tienan，et al. Compressive mechanical properties and strength prediction model of concrete-granite combined body under active confining pressure[J]. Rock and Soil Mechanics，2022，43(11)：2 984-2 994.(in Chinese))
[3]	GHASEMI E，ATAEI M，SHAHRIAR K. An intelligent approach to predict pillar sizing in designing room and pillar coal mines[J]. International Journal of Rock Mechanics and Mining Sciences，2014，65：86-95.
[5]	窦林名，陆菜平，牟宗龙，等. 组合煤岩冲击倾向性特性试验研究[J]. 采矿与安全工程学报，2006，23(1)：43-46.(DOU Linming，LU Caiping，MU Zonglong，et al．Rock burst tendency of coal-rock combinations sample[J]. Journal of Mining and Safety Engineering，2006，23(1)：43-46.(in Chinese))
[11]	赵同彬，尹延春，谭云亮，等. 变刚度加载试验系统的研制及其在煤岩破坏力学行为测试中的应用[J]. 岩石力学与工程学报，2022，41(9)：1 846-1 857.(ZHAO Tongbin，YIN Yanchun，TAN Yunliang，et al. Development of a variable stiffness loading test system and its application in testing the mechanical behavior of coal and rock failure[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(9)：1 846-1 857.(in Chinese))
[13]	左建平，陈岩，张俊文，等．不同围压作用下煤-岩组合体破坏行为及强度特征[J]．煤炭学报，2016，41(11)：2 706-2 713.(ZUO Jianping，CHEN Yan，ZHANG Junwen，et al. Failure behavior and strength characteristics of coal-rock combined body under different confining pressure[J]. Journal of China Coal Society，2016，41(11)：2 706-2 713.(in Chinese))
[15]	宫凤强，叶豪，罗勇. 低加载率范围内煤岩组合体冲击倾向性的率效应试验研究[J]. 煤炭学报，2017，42(11)：2 852-2 860. (GONG Fengqiang，YE Hao，LUO Yong. Rate effect on the burst tendency of coal-rock combined body under low loading rate range[J]. Journal of China Coal Society，2017，42(11)：2 852-2 860.(in Chinese))
[21]	彭阳，高永涛，王文林，等. 单侧限压缩煤岩组合体的破裂机制研究[J]. 岩土力学，2023，44(增1)：387-398.(PENG Yang，GAO Yongtao，WANG Wenlin，et al. Research on fracture mechanism of coal rock mass under the condition of one side restriction loading[J]. Rock and Soil Mechanics，2023，44(Supp.1)：387-398.(in Chinese))
[23]	GUO W Y，TAN Y L，YU F H，et al. Mechanical behavior of rock-coal-rock specimens with different coal thicknesses[J]. Geomechanics and Engineering，2018，15(4)：1 017-1 027.
[25]	YIN D W，CHEN S J，LIU X Q，et al. Effect of joint angle in coal on failure mechanical behaviour of roof rock-coal combined body[J]. Quarterly Journal of Engineering Geology and Hydrogeology，2018，51(2)：202-209.
[31]	康红普，伊丙鼎，高富强，等. 中国煤矿井下地应力数据库及地应力分布规律[J]. 煤炭学报，2019，44(1)：23-33.(KANG Hongpu，YI Bingding，CAO Fuqiang，et al. Database and characteristics of underground in-situ stress distribution in Chinese coal mines[J]. Journal of China Coal Society，2019，44(1)：23-33.(in Chinese))
[33]	卢志国，鞠文君，王浩，等. 硬煤冲击倾向各向异性特征及破坏模式试验研究[J]. 岩石力学与工程学报，2019，38(4)：757-768.(LU Zhiguo，JU Wenjun，WANG Hao，et al. Experimental study on anisotropic characteristics of impact tendency and failure model of hard coal[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(4)：757-768.(in Chinese))
[35]	卢志国，鞠文君，高富强，等. 基于非线性储能与释放特征的煤冲击倾向性指标[J]. 岩石力学与工程学报，2021，40(8)：1 559-1 569. (LU Zhiguo，JU Wenjun，GAO Fuqiang，et al. Bursting liability index of coal based on nonlinear storage and release characteristics of elastic energy[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(8)：1 559-1 569.(in Chinese))
[16]	LI C J，XU Y，CHEN P Y，et al. Dynamic mechanical properties and fragment fractal characteristics of fractured coal-rock-like combined bodies in split Hopkinson pressure bar tests[J]. Natural Resources Research，2020，29(5)：3 179-3 195.
[19]	ZHAO Z H，WANG W M，DAI C Q，et al. Failure characteristics of three-body model composed of rock and coal with different strength and stiffness[J]. Transaction Nonferrous Metals Society of China，2014，24：1 538-1 546.
[26]	LIU J W，WU N，SI G Y，et al. Experimental study on mechanical properties and failure behaviour of the pre-cracked coal-rock combination[J]. Bulletin of Engineering Geology and the Environment，2020，81：1-15.
[29]	邓绪彪，胡海娟，徐刚，等．两体岩石结构冲击失稳破坏的数值模拟[J]．采矿与安全工程学报，2012，29(6)：833-839.(DENG Xubiao，HU Haijuan，XU Gang，et al. Numerical simulation for burst failure of two-body rock structure[J]. Journal of Mining and Safety Engineering，2012，29(6)：833-839.(in Chinese))
[36]	苏国韶，蒋剑青，冯夏庭，等. 岩爆弹射破坏过程的试验研究[J]. 岩石力学与工程学报，2016，35(10)：1 990-1 999.(SU Guoshao，JIANG Jianqing，FENG Xiating，et al. Experimental study of ejection process in rockburst[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(10)：1 990-1 999.(in Chinese))