黏结剂含量对含瓦斯煤剪切细观损伤力学特性影响的试验研究

doi:10.16285/j.rsm.2015.09.005

›› 2015, Vol. 36 ›› Issue (9): 2467-2477.doi: 10.16285/j.rsm.2015.09.005

黏结剂含量对含瓦斯煤剪切细观损伤力学特性影响的试验研究

程立朝^{1, 2}，许江²，冯丹²，田傲雪 ²，刘义鑫²

1. 河北工程大学资源学院，河北邯郸 056038；2. 重庆大学煤矿灾害动力学与控制国家重点试验室，重庆 400044

收稿日期:2014-04-04 出版日期:2015-09-10 发布日期:2018-06-13
作者简介:程立朝，男，1976年生，博士，讲师，主要从事矿山灾害预测理论及控制方面的研究工作。
基金资助:
国家自然科学基金资助项目（No.51474040）；重庆市基础与前沿研究计划项目（No.cstc2013jjB90001）；邯郸市科学技术研究与发展计划项目（No.1323103077-5）；国家科技重大专项（No.2011ZX05034-004）。

Effect of binder content on mesoscopic damage mechanical characteristics of gas-bearing coal subjected to shear load

CHENG Li-chao^{1, 2}, XU Jiang², FENG Dan ², TIAN Ao-xue², LIU Yi-xin²

1. College of Resources, Hebei University of Engineering, Handan, Hebei 056038, China; 2. State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Received:2014-04-04 Online:2015-09-10 Published:2018-06-13

摘要/Abstract

摘要： 采用自主研发的含瓦斯煤岩细观剪切试验装置，开展不同黏结剂含量条件下的含瓦斯煤剪切试验研究，研究了煤的强度特性、裂纹演化模式、裂纹长度变化规律、细观裂纹形态特征和形成机制，并探讨了黏结剂含量对含瓦斯煤剪切力学特性、裂纹宏细观演化和损伤特性的影响。研究结果表明：随着黏结剂含量的增加，含瓦斯煤抗剪强度较好地服从线性增加关系，宏观裂纹的数目和分叉在增加，峰后稳定阶段所占总试验阶段的比例不断减小；裂纹总有效长度变化可分为急增、缓增和稳定3个阶段；随着黏结剂含量的增加，相邻裂纹之间的损伤区类型发生变化，宏观断裂面形成方式由裂纹的直接连通向主裂纹分叉连通和翼型主裂纹间损伤区连通方式转化；通过对黏结剂含量为5.3%条件下含瓦斯煤剪切细观裂纹形成机制分析可知，宏观裂纹前端存在几条由宽到窄、近似在一条线上分布的细观裂纹，前方新裂纹不断出现，后方裂纹不断长大，并发生翼裂纹连通，翼型裂纹重叠部分产生损伤，形成宏观裂纹，从而引起宏观裂纹不断向前扩展；主裂纹壁的次级裂纹是由几条呈雁行式排列的翼型裂纹组成；主裂纹之间的贯通方式为翼裂纹和反翼裂纹连通，取决于其相对位置。

关键词: 岩石力学, 细观力学, 含瓦斯煤, 裂纹扩展, 剪切试验

Abstract: In this study, shear tests are conducted on gas-containing coal with different binder contents using a self-developed meso-shear test equipment. Firstly, mechanical behaviors of coal are investigated, including strength characteristic, crack evolution mode, variation law of crack length, morphology and formation mechanism of mesoscopic crack. Then the effects of binder content on shear mechanical properties, crack macro-meso evolution and damage characteristics are discussed. The results show that shear strength of coal increases linearly with the increase of binder content, and the number and bifurcation of macroscopic cracks also increase, however the proportion of post-peak stable stage decreases. The development of total effective crack length can be divided into three stages: surge, slow increase and steady stage. With the increase of binder content, the type of damage zone between neighboring cracks changes and the mode of formed fracture surface converts from direct coalesces of cracks to bifurcation of main cracks and damage zone connection of the main wing cracks. The mechanism of formed shear mesoscopic crack of gas-containing coal with a binder content of 5.3% is analyzed. It is found that there are several mesoscopic cracks ahead a macroscopic crack, which changes from narrow to wide and approximately distribute along a straight line. Wing cracks connect, which are caused by the continuous appearance of new cracks in the front and the growth of original cracks in the rear . Once the overlap of wing cracks damages, a macroscopic crack occurs and then expands forward step by step. Secondary crack of the main crack wall is composed of several wing cracks arranged as an echelon. Coalescence modes of macro main cracks are connected by wing and anti-wing cracks, which depend on the relative position of adjacent cracks.

Key words: rock mechanics, mesomechanics, gas-bearing coal, crack propagation, shear test

中图分类号:

TU 452

程立朝，许江，冯丹，田傲雪，刘义鑫，. 黏结剂含量对含瓦斯煤剪切细观损伤力学特性影响的试验研究[J]. , 2015, 36(9): 2467-2477.

CHENG Li-chao , XU Jiang , FENG Dan , TIAN Ao-xue , LIU Yi-xin，. Effect of binder content on mesoscopic damage mechanical characteristics of gas-bearing coal subjected to shear load[J]. , 2015, 36(9): 2467-2477.

参考文献

相关文章 15

[1]	闫超萍, 龙志林, 周益春, 旷杜敏, 陈佳敏, . 钙质砂剪切特性的围压效应和粒径效应研究[J]. 岩土力学, 2020, 41(2): 581-591.
[2]	张艳博, 孙林, 姚旭龙, 梁鹏, 田宝柱, 刘祥鑫, . 花岗岩破裂过程声发射关键信号时频特征试验研究[J]. 岩土力学, 2020, 41(1): 157-165.
[3]	张国凯, 李海波, 王明洋, 李晓锋, . 基于声学测试和摄像技术的单裂隙岩石裂纹扩展特征研究[J]. 岩土力学, 2019, 40(S1): 63-72.
[4]	何鹏飞, 马巍, 穆彦虎, 黄永庭, 董建华, . 黄土−砂浆块界面剪切特性试验及本构模型研究[J]. 岩土力学, 2019, 40(S1): 82-90.
[5]	侯会明, 胡大伟, 周辉, 卢景景, 吕涛, 张帆, . 考虑细观等效热学参数的高放废物处置库围岩应力−渗流−温度耦合模拟方法[J]. 岩土力学, 2019, 40(9): 3625-3634.
[6]	孙博, 杨怀德, 谷玲, 刘跃, 唐碧华, 赵桂连, 张连明. 基于UDEC颗粒模型的不确定性分析[J]. 岩土力学, 2019, 40(9): 3679-3688.
[7]	大久保诚介, 汤杨, 许江, 彭守建, 陈灿灿, 严召松, . 3D-DIC系统在岩石力学试验中的应用[J]. 岩土力学, 2019, 40(8): 3263-3273.
[8]	张传庆, 刘振江, 张春生, 周辉, 高阳, 侯靖, . 隐晶质玄武岩破裂演化及破坏特征试验研究[J]. 岩土力学, 2019, 40(7): 2487-2496.
[9]	张艳博, 梁鹏, 孙林, 田宝柱, 姚旭龙, 刘祥鑫, . 单轴压缩下饱水花岗岩破裂过程声发射频谱特征试验研究[J]. 岩土力学, 2019, 40(7): 2497-2506.
[10]	马秋峰, 秦跃平, 周天白, 杨小彬. 多孔隙岩石加卸载力学特性及本构模型研究[J]. 岩土力学, 2019, 40(7): 2673-2685.
[11]	田军, 卢高明, 冯夏庭, 李元辉, 张希巍. 主要造岩矿物微波敏感性试验研究[J]. 岩土力学, 2019, 40(6): 2066-2074.
[12]	王海军, 郁舒阳, 任然, 汤雷, 李欣昀, 贾宇, . 基于3D-ILC含内裂纹孔口脆性固体断裂特性试验[J]. 岩土力学, 2019, 40(6): 2200-2212.
[13]	金俊超, 佘成学, 尚朋阳. 基于应变软化指标的岩石非线性蠕变模型[J]. 岩土力学, 2019, 40(6): 2239-2246.
[14]	苏国韶, 燕思周, 闫召富, 翟少彬, 燕柳斌, . 真三轴加载条件下岩爆过程的声发射演化特征[J]. 岩土力学, 2019, 40(5): 1673-1682.
[15]	杨石扣, 张继勋, 任旭华, . 基于改进数值流形法的接触裂纹问题研究[J]. 岩土力学, 2019, 40(5): 2016-2021.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

黏结剂含量对含瓦斯煤剪切细观损伤力学特性影响的试验研究

Effect of binder content on mesoscopic damage mechanical characteristics of gas-bearing coal subjected to shear load

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 10