单轴多级循环加载下原煤加卸载响应比演化特征

doi:10.13722/j.cnki.jrme.2017.1153

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1482 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要煤矿井工开采往往对采场周边煤岩体产生周期性扰动，研究单轴多级循环加卸载条件下煤变形及破坏特征有助于深入认识煤柱损伤、劣化及失稳破坏机制，并为获取煤柱失稳前兆提供有效分析手段。通过开展原煤单轴多级循环加卸载实验，利用弹性模量变化量提取加卸载响应比以描述原煤破坏前兆特征；并基于声发射累计振铃计数定义加卸载响应比，探讨原煤破坏过程中内部损伤演化特征及破坏前兆。此外，通过对实验前、后煤样内部结构的CT扫描，结合逆向化建模方法，分析煤样破坏特征及模拟单元数量对加卸载响应比数值计算结果的影响。研究发现：基于实验获得的单轴循环载荷下原煤加卸载响应比存在3个变化阶段，且在每级应力水平下均呈周期性“W”型变化特征；当荷载水平逐渐升高时加卸载响应比呈下降趋势，当荷载水平较高且接近峰值荷载时，加卸载响应比先下降后急剧上升；而基于声发射累计振铃数计算的加卸载响应比则呈持续减小趋势，并在破坏前接近1。

	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
	赵毅鑫1
	2
	3
	龚爽1
	2
	滕腾1
	2
	姜耀东1
	3
	杨志良1
	2
	陈恺1

关键词 ：岩石力学, 循环加卸载, 加卸载响应比, 三维逆向化, CT扫描

Abstract：In mining engineering，the periodic perturbation to rock mass induced by roadway excavation and mining affects the mechanical properties of surrounding rocks. Thus，studying the failure characteristic of raw coal under cyclic loading will help to understand the damage and deterioration mechanism of coal pillar，and to provide the effective means for the analysis of coal pillar instability. In this study，a uniaxial cyclic loading and unloading experiment at different stress levels on raw coal was conducted. Based on the experiment，a load/unload response ratio was defined according to the variation of elastic modulus to describe the failure characteristics of coal. Another response ratio was defined with the accumulative acoustic emission ring counts to describe the evolution of internal damage of coal. A three-dimensional numerical model was established and studied based on the geometric data obtained by CT scanning. The results show that the evolution of the load/unload response ratio of raw coal under uniaxial cyclic loading has three stages，showing a periodic W-shaped variation at each stress level. Moreover，the load/unload response ratio decreases with the increase of loading stress level. It is also found that the load/unload response ratio drops a little bit and then increases suddenly as the loading stress close to the peak stress. However，the load/unload response ratio reaches minimal and fluctuates near 1 as the specimen is on the verge of damage based on the analysis of acoustic emission ring counts.

Key words： rock mechanics cyclic loading and unloading load/unload response ratio three-dimensional numerical inversion method CT scan

引用本文:

赵毅鑫1，2，3，龚爽1，2，滕腾1，2，姜耀东1，3，杨志良1，2，陈恺1. 单轴多级循环加载下原煤加卸载响应比演化特征[J]. 岩石力学与工程学报, 2018, 37(5): 1096-1105.
ZHAO Yixin1，2，3，GONG Shuang1，2，TENG Teng1，2，JIANG Yaodong1，3，YANG Zhiliang1，2，CHEN Kai1. Characteristics of the load/unload response ratio of raw coal under uniaxial multi-level cyclic loading. , 2018, 37(5): 1096-1105.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1153 或 http://www.rockmech.org/CN/Y2018/V37/I5/1096

[6]	JULIE E T. An independent assessment of the load/unload response ratio(LURR) proposed method of earthquake prediction[M. S. Thesis][D]. Providence：Brown University，2004.
[9]	苗胜军，樊少武，蔡美峰，等. 基于加卸载响应比的载荷岩石动力学特征试验研究[J]. 煤炭学报，2009，34(3)：329-333.(MIAO Shengjun，FAN Shaowu，CAI Meifeng，et al. Dynamic characteristics experiment study of loading rock based on theory of load/unload response ratio[J]. Journal of China Coal Society，2009，34(3)：329-333.(in Chinese))
[3]	尹祥础，PETER M，彭克银. 加卸载响应比(Load/Unload Response Ratio)、能量加速释放(AE/MR)的临界区尺度及地震预测[J]. 国际地震动态，2004，(5)：24-30.(YIN Xiangchu，PETER M，PENG Keyin. Load/unload response ratio，critical region scale of energy accelerated release and earthquake prediction[J]. Recent Development in World Seismology，2004，(5)：24-30.(in Chinese))
[13]	刘建坡. 基于声发射技术岩石破坏前兆特征实验研究[硕士学位论文][D]. 沈阳：东北大学，2008.(LIU Jianpo. Study on precursory characteristics of rock failure based on acoustic emission technique[M. S. Thesis][D]. Shenyang：Northeastern University，2008.(in Chinese))
[20]	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))
[23]	杨永杰，王德超，郭明福，等. 基于三轴压缩声发射试验的岩石损伤特征研究[J]. 岩石力学与工程学报，2014，33(1)：98-104.(YANG Yongjie，WANG Dechao，GUO Mingfu，et al. Study of rock damage characteristics based on acoustic emission tests under triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(1)：98-104.(in Chinese))
[1]	SINGH U K，DIGBY P J. A continuum damage model for simulation of the progressive failure of brittle rocks[J]. International Journal of Solids and Structures，1989，25(6)：647-663.
[11]	余怀忠，尹祥础，梁乃刚. 加卸载响应比(LURR)响应量的研究[J]. 西北地震学报，2004，26(4)：298-302.(YU Huaizhong，YIN Xiangchu，LIANG Naigang. Research on the response of load/unload response ratio[J]. Northwestern Seismological Journal，2004，26(4)：298-302.(in Chinese))
[21]	蔡美峰. 岩石力学与工程[M]. 北京：科学出版社，2013：45-48.(CAI Meifeng. Rock mechanics and engineering[M]. Beijing：Science Press，2013：45-48.(in Chinese))
[25]	ZHAO Y X，LIU S M，ZHAO G F，et al. Failure mechanisms in coal：Dependence on strain rate and microstructure[J]. Journal of Geophysical Research Solid Earth，2015，119(9)：6 924-6 935.
[7]	施行觉，许和明，万永中，等. 模拟引潮力作用下的岩石破裂特征——加卸载响应比理论的实验研究之一[J]. 地球物理学报，1994，37(5)：633-637.(SHI Xingjue，XU Heming，WAN Yongzhong，et al. The characteristic of rock fracture under simulated tide force- laboratory study on the theory of loading and unloading response ratio[J]. Acta Geophysica Sinica，1994，37(5)：633-637.(in Chinese))
[16]	巩思园，窦林名，何江，等. 深部冲击倾向煤岩循环加卸载的纵波波速与应力关系试验研究[J]. 岩土力学，2012，33(1)：41-47.(GONG Siyuan，DOU Linming，HE Jiang，et al. Study of correlation between stress and longitudinal wave velocity for deep burst tendency coal and rock samples in uniaxial cyclic loading and unloading experiment[J]. Rock and Soil Mechanics，2012，33(1)：41-47.(in Chinese))
[17]	尤明庆. 复杂路径下岩样的强度和变形特性[J]. 岩石力学与工程学报，2002，21(1)：23-28.(YOU Mingqing. Strength and deformation of rock under complex loading path[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(1)：23-28.(in Chinese))
[19]	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))
[26]	赵毅鑫，赵高峰，姜耀东，等. 基于微焦点CT的煤岩细观破裂机制研究[M]. 北京：科学出版社，2013：128-132.(ZHAO Yixin，ZHAO Gaofeng，JIANG Yaodong，et al. Study on meso fracture mechanism of coal based on micro-CT[M]. Beijing：Science Press，2013：128-132.(in Chinese))
[4]	尹祥础，尹迅飞，余怀忠，等. 加卸载响应比理论用于矿震预测的初步研究[J]. 地震，2004，24(2)：25-30.(YIN Xiangchu，YIN Xunfei，YU Huaizhong，et al. Preliminary study on mining induced earthquake prediction in terms of loading-unloading response ratio[J]. Earthquake，2004，24(2)：25-30.(in Chinese))
[14]	CAN Y，PETER M. Some preliminary thoughts about the LURR phenomenon[C]// Proceedings of the 4th ACES Workship. Beijing：China Earthquake Administration. [s.l.]：[s.n.]，2004：85-87.
[24]	尹祥础，刘月. 加卸载响应比——地震预测与力学的交叉[J]. 力学进展，2013，43(6)：555-580.(YIN Xiangchu，LIU Yue. Load-unload response ratio—An interplay between earthquake prediction and mechanics[J]. Advances in Mechanics，2013，43(6)：555-580.(in Chinese))
[2]	尹祥础，陈学忠，宋志平. 加卸载响应比理论及其在地震预测中的应用研究进展[J]. 地球物理学报，1994，37(1)：223-230.(YIN Xiangchu，CHEN Xuezhong，SONG Zhiping. The development of load-unload response ratio theory and its application to earthquake prediction[J]. Acta Geophysica Sinica，1994，37(1)：223-230.(in Chinese))
[5]	宋治平，尹祥础，梅世蓉. 地震前兆异常迁移速率的非线性变化特征及其力学解释[J]. 地震，1996，16(4)：372-376.(SONG Zhiping，YIN Xiangchu，MEI Shirong. The nonlinear variation characteristics of seismic precursor anomaly migration velocity and its mechanical interpretation[J]. Earthquake，1996，16(4)：372-376.(in Chinese))
[8]	王裕仓，尹祥础，王海涛. 地震预测的加卸载响应比岩石实验模拟[J]. 中国地震：1998，14(2)：126-130.(WANG Yucang，YIN Xiangchu，WANG Haitao. The simulation of rock experiment on load/unload response ratio on earthquake prediction[J]. Earthquake Research in China，1998，14(2)：126-130.(in Chinese))
[10]	余怀忠，尹祥础，夏蒙棼，等. 加卸载响应比(LURR)理论的实验研究[J]. 中国地震，2003，19(1)：58-66.(YU Huaizhong，YIN Xiangchu，XIA Mengfen，et al. Experimental research on the theory of LURR(Load/unload response ratio)[J]. Earthquake Research in China，2003，19(1)：58-66.(in Chinese))
[12]	王裕仓，尹祥础，彭克银，等. 加卸载响应比的数值模拟[J]. 地球物理学报，1999，42(5)：669-676.(WANG Yucang，YIN Xiangchu，PENG Keyin，et al. Numerical simulation on load/unload response ratio theory[J]. Chinese Journal of Geophysics，1999，42(5)：669-676.(in Chinese))
[15]	ABE S，PLACE D，MORA P. A parallel implementation of the lattice solid model for the simulation of rock mechanics and earthquake dynamics[J]. Pure and Applied Geophysics，2004，161(11)：2 265-2 277.
[18]	汪斌，朱杰兵，邬爱清，等. 锦屏大理岩加、卸载应力路径下力学性质试验研究[J]. 岩石力学与工程学报，2008，27(10)：2 138- 2 145.(WANG Bin，ZHU Jiebing，WU Aiqing，et al. Experimental study on mechanical properties of Jinping marble under loading and unloading stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)：2 138-2 145.(in Chinese))
[22]	包春燕，姜谙男，唐春安，等. 单轴加卸载扰动下石灰岩声发射特性研究[J]. 岩石力学与工程学报，2011，30(增2)：3 871-3 877. (BAO Chunyan，JIANG Annan，TANG Chun¢an，et al. Study of acoustic emission characteristics of limestone under cycle uniaxial loading- unloading perturbation[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(Supp.2)：3 871-3 877.(in Chinese))