|
|
|
| A new brittleness index for hard coal considering unsteady energy release at post-peak stage |
| HAO Xianjie1，2，3，YUAN Liang4，5，GUO Yanding3，LI Yulin3，ZHAO YiXin3，WANG Xinzhong3，ZHU Guangpei3，LU Zhiguo3，REN Bo5 |
(1. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology(Beijing)，Beijing 100083，China；2. Research Center of Coal Resources Safe Mining and Clean Utilization，Liaoning Technical University，Fuxin，Liaoning 123000，China；3. School of Resource and Safety Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；4. Anhui University of Science and Technology，Huainan，Anhui 232000，China；5. State Coal Mining
National Engineering Technology Research Institute，Huainan，Anhui 232000，China) |
|
|
|
|
Abstract The post peak stress-strain curves of coal are often presented curved and benched drop. The current brittleness index expressed by gradient drop of compressive stress-strain cannot distinguish the linear，curved and benched drop. A new index to characterize the brittleness of hard coal based on unsteady energy release is thus proposed to overcome the problem. The brittleness of coal is the parameter characterizing the speed of energy release under the action of minute external energy in the post-peak stage. The mechanical and geometrical models of brittleness index were established according to the energy accumulation in pre-peak stage and the energy release in post-peak stage，which were validated theoretically and experimentally subsequently. Finally，the classification of bursting liability of coal according this index is studied. The results indicated that，compared with other indexes，this index can consider the longer nonlinear elastic phase of the hard coal，the shorter plastic and post-peak benched drop characteristics and so on.
|
|
|
|
|
|
[1] 周 辉，孟凡震，刘海涛，等. 花岗岩脆性破坏特征与机制试验研究[J]. 岩石力学与工程学报，2014，33(9)：1 822–1 827.(ZHOU Hui，MENG Fanzhen，LIU Haitao，et al. Experimental study on characteristics and mechanism of brittle failure of granite[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(9)：1 822– 1 827.(in Chinese))
[2] 吴 涛. 页岩气层岩石脆性影响因素及评价方法研究[硕士学位论文][D]. 成都：西南石油大学，2015.(WU Tao. Research on affecting factors and evaluation method of shale gas rock brittleness[M. S. Thesis][D]. Chengdu：Southwest Petroleum University，2015.(in Chinese))
[3] 王 宇，李 晓，武艳芳，等. 脆性岩石起裂应力水平与脆性指标关系探讨[J]. 岩石力学与工程学报，2014，33(2)：264–275.(WANG Yu，LI Xiao，WU Yanfang，et al. research on relationship between crack initiation stress level and brittleness indices for brittle rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(2)：264–275.(in Chinese))
[4] 刁海燕. 泥页岩储层岩石力学特性及脆性评价[J]. 岩石学报，2013，29(9)：344–350.(DIAO Haiyan. Rock mechanical properties and brittleness evaluation of shale reservoir[J]. Acta Petrologica Sinica，2013，29(9)：344–350.(in Chinese))
[5] 陈 吉，肖贤明. 南方古生界3套富有机质页岩矿物组成与脆性分析[J]. 煤炭学报，2013，38(5)：822–826.(CHEN Ji，XIAO Xianming. Mineral composition and brittleness of three sets of Paleozoic organic- rich shales in China South area[J]. Journal of China Coal Society，2013，38(5)：822–826.(in Chinese))
[6] 代高飞，尹光志，皮文丽. 单轴压缩荷载下煤岩的弹脆性损伤本构模型[J]. 同济大学学报：自然科学版，2004，32(8)：986–989.(DAI Gaofei，YIN Guangzhi，PI Wenli. Research on damage constitutive model and evolution equation of coal under uniaxial compression[J]. Journal of Tongji University：Natural Science，2004，32(8)：986–989.(in Chinese))
[7] 戴珊珊. 基于ABAQUS模拟镐形截齿截割脆性煤岩[J]. 煤矿机械，2012，33(5)：52–54.(DAI Shanshan. Simulation of brittle coal cutting by conical pick based on ABAQUS[J]. Coal Mine Machinery，2012，33(5)：52–54.(in Chinese))
[8] 苏现波，谢洪波，华四良. 煤体脆–韧性变形微观识别标志[J]. 煤田地质与勘探，2003，31(6)：18–21.(SU Xianbo，XIE Hongbo，HUA Siliang. The microscopic identification of coal brittle-ductile deformation[J]. Coal Geology and Exploration，2003，31(6)：18–21.(in Chinese))
[9] 白庆升，屠世浩. 脆煤综放面煤壁片帮机制及控制技术[J]. 煤炭与化工，2014，(1)：14–19.(BAI Qingsheng，TU Shihao. Brittle coal caving mining face coal wall rib spalling mechanism and control technology[J]. Coal and Chemical Industry，2014，(1)：14–19.(in Chinese))
[10] 周 辉，孟凡震，张传庆，等. 基于应力–应变曲线的岩石脆性特征定量评价方法[J]. 岩石力学与工程学报，2014，33(6)：1 114– 1 122.(ZHOU Hui，MENG Fanzhen，ZHANG Chuanqing，et al. quantitative evaluation of rock brittleness based on stress-strain curve[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(6)：1 114–1 122.(in Chinese))
[11] 夏英杰，李连崇，唐春安，等. 基于峰后应力跌落速率及能量比的岩体脆性特征评价方法[J]. 岩石力学与工程学报，2016，35(6)：1 141–1 154.(XIA Yingjie，LI Lianchong，TANG Chun?an，et al. Rock brittleness evaluation based on stress dropping rate after peak stress and energy ratio[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(6)：1 141–1 154.(in Chinese))
[12] BISHOP A W. Progressive failure with special reference to the mechanism causing it[C]// Proceedings of the Geotechnical Conference on Shear Strength Properties of Natural Soils and Rocks. Oslo：Norwegian Geotechnical Institute，1967：142–150.
[13] 李庆辉，陈 勉，金 衍，等. 页岩脆性的室内评价方法及改进[J].岩石力学与工程学报，2012，31(8)：1 680–1 685.(LI Qinghui，CHEN Mian，JIN Yan，et al. Indoor evaluation method for shale brittleness and improvement[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(8)：1 680–1 685.(in Chinese))
[14] 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. 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))
[15] 左建平，黄亚明，熊国军，等. 脆性岩石破坏的能量跌落系数研究[J]. 岩土力学，2014，35(2)：321–327.(ZUO Jianping，HUANG Yaming，XIONG Guojun，et al. Study of energy-drop coefficient of brittle rock failure[J]. Rock and Soil Mechanics，2014，35(2)：321–327.(in Chinese))
[16] 黄 达，谭 清，黄润秋. 高应力强卸荷条件下大理岩损伤破裂的应变能转化过程机制研究[J]. 岩石力学与工程学报，2012，31(12)：2 483–2 493.(HUANG Da，TAN Qing，HUANG Runqiu. Mechanism of strain energy conversion process for marble damage and fracture under high stress and rapid unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(12)：2 483–2 493.(in Chinese))
[17] 何 俊，潘结南，王安虎. 三轴循环加卸载作用下煤样的声发射特征[J]. 煤炭学报，2014，39(1)：84–90.(HE Jun，PAN Jienan，WANG Anhu，et al. Acoustic emission characteristics of coal specimen undertriaxial cyclic loading and unloading[J]. Journal of China Coal Society，2014，39(1)：84–90.(in Chinese))
[18] 谢和平，彭瑞东，鞠 杨，等. 岩石破坏的能量分析初探[J]. 岩石力学与工程学报，2005，24(15)：2 603–2 608.(XIE Heping，PENG Ruidong，JU Yang，et al. On energy analysis of rock failure[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(15)：2 603– 2 608.(in Chinese))
[19] 中华人民共和国国家标准编写组. GB/T 25217.1 煤的冲击倾向分类及指数的测定方法[S]. 北京：国家煤炭工业局行业管理司，2010.(The National Standards Compilation Group of People?s Republic of China. GB/T 25217.1 Classification of bursting liability of coal and determination of its index[S]. Beijing：State Administration of Coal Industry，2010.(in Chinese)) |
| [1] |
LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
|
|
|
|
2017, Vol. 36 
