真三轴循环载荷作用下煤岩力学及损伤特征试验研究

doi:10.13722/j.cnki.jrme.2020.0916

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1975 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为了研究煤矿采掘过程中真三轴循环扰动应力对煤岩力学特征的影响，利用GCTS真三轴力学试验系统，开展分级循环中间主应力下的煤岩力学试验研究，分析分级循环对煤岩变形、能耗及损伤特征的影响，揭示真三轴循环过程中的中间主应力效应。研究结果表明：分级循环对中间主应变和最小主应变的影响明显大于最大主应变。随着最小主应力值增加，分级循环引起地和都明显降低。循环加或卸载都可引起煤岩的失稳破坏，且当较小时，煤岩倾向于在卸载至靠近的过程中发生破坏，而当较大时，煤岩倾向于在加载至靠近最大主应力的过程中发生破坏，但破坏时对应的逼近率相近都在70%左右。的加载和卸载作用对煤岩的残余变形甚至破坏具有等效性。随着分级循环幅度的增加，煤岩的总耗散能呈“指数型”增加，煤岩的损伤变量呈现明显的“减速→加速→再减速”的S型变化趋势。分级循环过程中的煤岩平均安全损伤变量阈值为Dc = 0.9。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	段敏克1
	蒋长宝2
	郭现伟3
	杨科1
	张向阳1
	马海峰1

关键词 ：岩石力学, 原煤, 循环中间主应力, 残余应变, 能量耗散, 损伤变量

Abstract：To study the influence of true triaxial cyclic disturbance stresses on the mechanical characteristics of coal in the process of mining and excavation，the coal mechanical experiment under the intermediate principal stress() of tiered cycle is carried out based on GCTS true triaxial mechanical experiment system，and the influence of on deformation，energy consumption and damage characteristics of coal is analyzed. The results show that the effect of tiered cyclic on and is greater than that on . With increasing ，both and decrease significantly. Cyclic loading or unloading of can cause instability and failure of coal. When σ3 is small，coal tends to be destroyed in the process of unloading to close to ，and when is large，coal tends to be destroyed in the process of loading close to . However，the approximation rate of corresponding to failure is similar，all around 70%. The loading or unloading of has equivalent effect on the residual deformation and even failure of coal. With increasing the amplitude of tiered cyclic ，the total dissipation energy of coal increases exponentially，and the damage variable of coal presents an obvious S-type change trend of deceleration, acceleration and re-deceleration. The threshold value of the average safety damage variable of coal and rock is 0.9 in the process of tiered cyclic.

Key words： rock mechanics coal cyclic intermediate principal stress residual strain energy dissipation damage variable

引用本文:

段敏克1，蒋长宝2，郭现伟3，杨科1，张向阳1，马海峰1. 真三轴循环载荷作用下煤岩力学及损伤特征试验研究[J]. 岩石力学与工程学报, 2021, 40(6): 1110-1118.
DUAN Minke1，JIANG Changbao2，GUO Xianwei3，YANG Ke1，ZHANG Xiangyang1，MA Haifeng1. Experimental study on mechanical and damage characteristics of coal under cyclic true triaxial loading. , 2021, 40(6): 1110-1118.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0916 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I6/1110

[6]	DUAN M K，JIANG C B，XING H L，et al. Study on damage of coal based on permeability and load-unload response ratio under tiered cyclic loading[J]. Arabian Journal of Geosciences，2020，13：250.
[4]	段敏克，蒋长宝，俞欢，等. 分级加-卸载条件下原煤渗透及能耗特征研究[J]. 岩土力学，2018，39(4)：1 346-1 354.(DUAN Minke，JIANG Changbao，YU Huan，et al. Study on permeability and energy consumption characteristics of raw coal under graded loading-unloading conditions[J]. Rock and Soil Mechanics，2018，39(4)：1 346-1 354.(in Chinese))
[9]	LIU C，YIN G Z，LI M H，et al. Deformation and permeability evolution of coals considering the effect of beddings[J]. International Journal of Rock Mechanics and Mining Sciences，2019，117：49-62.
[11]	陈宇龙，魏作安，张千贵. 等幅循环加载与分级循环加载下砂岩声发射 Felicity 效应试验研究[J]. 煤炭学报，2012，37(2)：226-230. (CHEN Yulong，WEI Zuoan，ZHANG Qiangui．Experimental study on Felicity effect of acoustic emission in rock under cyclic loading and tiered cyclic loading[J]. Journal of China Coal Society，2012，37(2)：226-230.(in Chinese))
[13]	YANG X L，CAO J，CHENG X Y，et al. Mechanical response characteristics and permeability evolution of coal samples under cyclic loading[J]. Energy Science Engineering，2019，(7)：1 588-1 604.
[14]	LI T T，PEI X J，WANG D P，et al. Nonlinear behavior and damage model for fractured rock under cyclic loading based on energy dissipation principle[J]. Engineering Fracture Mechanics，2019，206：330-341.
[16]	李楠，王恩元，赵恩来，等. 岩石循环加载和分级加载损伤破坏声发射实验研究[J]. 煤炭学报，2010，35(7)：1 099-1 103.(LI Nan，WANG Enyuan，ZHAO Enlai，et al. Experiment on acoustic emission of rock damage and fracture under cyclic loading and multi-stage loading[J]. Journal of China Coal Society，2010，35(7)：1 099-1 103. (in Chinese))
[19]	GAO Y H，FENG X T. Study on damage evolution of intact and jointed marble subjected to cyclic true triaxial loading[J]. Engineering Fracture Mechanics，2019，215：224-234.
[22]	JIANG C B，CHENG G J，DUAN M K，et al. Fluctuation in residual strain and dissipated energy of saturated sandstone under tiered cyclic loading[J]. PLoS ONE，2020，15(7)：e0236335.
[24]	JIANG C B，DUAN M K，YIN G Z，et al. Experimental study on seepage properties，AE characteristics and energy dissipation of coal under tiered cyclic loading[J]. Engineering Geology，2017，211：114-123.
[7]	ZHONG C L，ZHANG Z Y，RANJITH P G，et al. The role of pore water plays in coal under uniaxial cyclic loading[J]. Engineering Geology，2019，257：105-125.
[2]	李清淼，梁运培，邹全乐. 循环加卸载路径下不同含瓦斯煤渗流及损伤演化特征[J]. 煤炭学报，2019，44(9)：2 803-2 815.(LI Qingmiao，LIANG Yunpei，ZOU Quanle. Seepage and damage evolution characteristics of different gas-bearing coal under cyclic loading-unloading conditions[J]. Journal of China Coal Society，2019，44(9)：2 803-2 815.(in Chinese))
[5]	LIU C，YU B C，ZHANG D M，et al. Experimental study on strain behavior and permeability evolution of sandstone under constant amplitude cyclic loading-unloading[J]. Energy Science Engineering，2019，(8)：452-465.
[1]	PENG K，SHI S W，ZUO Q L，et al. Characteristics of energy storage and dissipation of coal under one-time cyclic load[J]. Energy Science Engineering，2020，(8)：3 117-3 135.
[3]	XIAO F，JIANG D Y，WU F，et al. Effects of prior cyclic loading damage on failure characteristics of sandstone under true-triaxial unloading conditions[J]. International Journal of Rock Mechanics and Mining Sciences，2020，132：104379.
[8]	ZHAO H G，LIU C，HU G，et al. Experimental investigation on rockburst process and failure characteristics in trapezoidal tunnel under different lateral stresses[J]. Construction and Building Materials，2020，259：119530.
[21]	SONG Z L，YIN G Z，RANJITH P G，et al. Influence of the intermediate principal stress on sandstone failure[J]. Rock Mechanics Rock Engineering，2019，52：3 033-3 046.
[10]	LIU Y B，YIN G Z，ZHANG D M，et al. Directional permeability evolution in intact and fractured coal subjected to true-triaxial stresses under dry and water-saturated conditions[J]. International Journal of Rock Mechanics and Mining Sciences，2019，119：22-34.
[12]	周家文，杨兴国，符文熹，等. 脆性岩石单轴循环加卸载试验及断裂损伤力学特性研究[J]. 岩石力学与工程学报，2010，29(6)：1 172-1 183.(ZHOU Jiawen，YANG Xingguo，FU Wenxi，et al．Experimental test and fracture damage mechanical characteristics of brittle rock under uniaxial cyclic loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(6)：1 172-1 183. (in Chinese))
[20]	FENG X T，GAO Y H，ZHANG X W，et al. Evolution of the mechanical and strength parameters of hard rocks in the true triaxial cyclic loading and unloading tests[J]. International Journal of Rock Mechanics and Mining Sciences，2020，131：104349.
[23]	蒋长宝，段敏克，尹光志，等. 不同含水状态下含瓦斯原煤加卸载试验研究[J]. 煤炭学报，2016，41(9)：2 230-2 237.(JIANG Changbao，DUAN Minke，YIN Guangzhi，et al. Loading-unloading experiments of coal containing gas under the condition of different moisture contents[J]. Journal of China Coal Society，2016，41(9)：2 230-2 237. (in Chinese))
[15]	YANG Y S，ZHANG D M，ZHANG F Y. Impact of loading-unloading on deformation and permeability of sandstone containing methane[J]. Energy Sources，Part A：Recovery，Utilization，and Environmental Effects，2020，3：1-18.
[17]	MOMENI A，KARAKUS M，KHANLARI G R. Effects of cyclic loading on the mechanical properties of a granite[J]. International Journal of Rock Mechanics and Mining Sciences，2015，77：89-96.
[18]	DUAN M K，JIANG C B，GAN Q，et al. Experimental investigation on the permeability，acoustic emission and energy dissipation of coal under tiered cyclic unloading[J]. Journal of Natural Gas Science Engineering，2020，73：103054.
[25]	彭瑞东，谢和平，鞠杨. 砂岩拉伸过程中的能量耗散与损伤演化分析[J]. 岩石力学与工程学报，2007，26(12)：2 526-2 531.(PENG Ruidong，XIE Heping，JU Yang. Analysis of energy dissipation and damage evolution of sandstone during tensile process[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(12)：2 526-2 531.(in Chinese))