高应力下原煤三轴压缩力学特性研究

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (807 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract According to the raw coal samples from B10 seam of －780 m elevation in Huainan coal mine，the MTS815.04 electro-hydraulic servo testing system is used to carry out the conventional triaxial compression test under high stress. The deformation，strength，parameters and failure characteristics of coal are studied. The results show that：(1) The deviatoric stress-axial strain curves of coal are mainly composed of stages of elastic，yield，post-peak brittle failure or strain softening segment. Among them，the elastic period is longer obviously，and the greater the confining pressure is，the steeper the curve is，the greater the elastic modulus is. But，the yield period is shorter. (2) The post peak brittle failure feature of coal is apparent under uniaxial loading or low confining pressure. As the confining pressure increases，the ductile features start to appear after peak. The higher the confining pressure is，the more obvious characteristics of ductility are. When the confining pressure reaches to 50 MPa，the post-peak axial strain almost presents plastic flow pattern. (3) With the increase of confining pressure，the peak axial strain increases in parabolic trend，and the peak lateral strain increases in linear trend. (4) The deviatoric stress-volume strain curve of coal shows dilatancy mechanism under low confining pressure. The lower confining pressure is，the more obvious the dilatancy features shows. In the high confining pressure，the curve from pre-peak to post-peak is always right extend，and presents a continuous shrinkage state. And with the increase of confining pressure，the peak volume strain presents a parabolic increase form，which reflects the shrinkage characteristics significantly. (5) With the increase of confining pressure，the strength of coal increases in linear trend. The strength parameters c，? are 12.72 MPa，24.12°， respectively. (6) The failure modes of coal samples are mainly given priority to shear failure，and the rupture angle is in the range of 23°–35°. With the increase of confining pressure，the rupture angle increases in parabolic trend. The change can be better explained by Mohr strength theory.

Key words： rock mechanics high stress raw coal triaxial compression deformation characteristics strength characteristics failure mechanism mechanical parameters

Received: 18 January 2013

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors

Cite this article:

URL:

https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I1/24

[1] 袁亮. 低透气性煤层群无煤柱煤与瓦斯共采理论与实践[M]. 北京：煤炭工业出版社，2008：1–5.(YUAN Liang. Theory and practice of integrated pillarless coal production and methane extraction in multiseams of low permeability[M]. Beijing：China Coal Industry Publishing House，2008：1–5.(in Chinese)) [2] 袁亮. 煤与瓦斯共采领跑煤炭科学开采[J]. 能源与节能，2011，67(4)：1–4.(YUAN Liang. Exploit coal and gas simultaneously lead scientific coal exploration[J]. Energy and Energy Conservation，2011，67(4)：1–4.(in Chinese)) [3] HOBBS D W. The strength and stress-strain characteristics of oakdale coal under triaxial compression[J]. Geological Magazine，1960，97(5)：422–435. [4] HOBBS D W. The strength and the stress-strain characteristics of coal in triaxial compression[J]. The Journal of Geology，1964，72(2)：214–231. [5] ATKINSON R H，KO H. Strength characteristics of U.S. coals.[C]// The 18th U.S. Symposium on Rock Mechanics (USRMS). Golden，CO：Colorado School of Mines Press，1977：2B3-1–6. [6] MEDHURST T P，Brown E T. A study of the mechanical behavior of coal for pillar design[J]. International Journal of Rock Mechanics and Mining Sciences，1998，35(8)：1 087–1 104. [7] 孟召平，彭苏萍，凌标灿. 不同侧压下沉积岩石变形与强度特征[J]. 煤炭学报，2000，25(1)：15–18.(MENG Zhaoping，PENG Suping，LING Biaocan. Characters of the deformation and strength under different confining pressures on sedimentary rock[J]. Journal of China Coal Society，2000，25(1)：15–18.(in Chinese)) [8] 苏承东，翟新献，李永明，等. 煤样三轴压缩下变形和强度分析[J]. 岩石力学与工程学报，2006，25(增1)：2 963–2 968.(SU Chengdong，ZHAI Xinxian，LI Yongming，et al. Study on deformation and strength of coal samples in triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.1)： 2 963–2 968.(in Chinese)) [9] 杨永杰，宋扬，陈绍杰. 三轴压缩煤岩强度及变形特征的试验研究[J]. 煤炭学报，2006，31(2)：150–153.(YANG Yongjie，SONG Yang，CHEN Shaojie. Test study of coal′s strength and deformation characteristics under triaxial compression [J]. Journal of China Coal Society，2006，31(2)：150–153.(in Chinese)) [10] 杨永杰，宋扬，陈绍杰，等. 煤岩强度离散性及三轴压缩试验研究[J]. 岩土力学，2006，27(10)：1 763–1 766.(YANG Yongjie，SONG Yang，CHEN Shaojie，et al. Experimental study on strength discreteness and triaxial compression of coal[J]. Rock and Soil Mechanics，2006，27(10)：1 763–1 766.(in Chinese)) [11] 王宏图，鲜学福，贺建民. 层状复合煤岩的三轴力学特性研究[J]. 矿山压力与顶板管理，1999，(1)：82–84.(WANG Hongtu，XIAN Xuefu，HE Jianmin. Study on the triaxial mechanical properties of a stratified coal-rock union[J]. Ground Pressure and Strata Control，1999，(1)：82–84.(in Chinese)) [12] 许江，鲜学福，杜云贵，等. 含瓦斯煤的力学特性的实验分析[J]. 重庆大学学报，1993，16(5)：42–47.(XU Jiang，XIAN Xuefu，DU Yungui，et al. An experimental study on the mechanical property of the gas-filled coal[J]. Journal of Chongqing University，1993，16(5)：42–47.(in Chinese)) [13] 尹光志，王登科，张东明，等. 两种含瓦斯煤样变形特性与抗压强度的实验分析[J]. 岩石力学与工程学报，2009，28(2)：410–417.(YIN Guangzhi，WANG Dengke，ZHANG Dongming，et al. Test analysis of deformation characteristics and compressive strengths of two types of coal specimens containing gas[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(2)：410–417.(in Chinese)) [14] 李小双，尹光志，赵洪宝，等. 含瓦斯突出煤三轴压缩下力学性质试验研究[J]. 岩石力学与工程学报，2010，29(增 1)：3 350–3 358. (LI Xiaoshuang，YIN Guangzhi，ZHAO Hongbao，et al. Experimental study of mechanical properties of outburst coal containing gas under triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.1)：3 350–3 358. (in Chinese)) [15] 苏承东，高保彬，南华，等. 不同应力路径下煤样变形破坏过程声发射特征的试验研究[J]. 岩石力学与工程学报，2009，28(4)：757–766.(SU Chengdong，GAO Baobin，NAN Hua，et al. Experimental study on acoustic emission characteristics during deformation and failure processes of coal samples under different stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(4)：757–766.(in Chinese)) [16] 刘保县，李东凯，赵宝云. 煤岩卸荷变形损伤及声发射特性[J]. 土木建筑与环境工程，2009，31(2)：57–61.(LIU Baoxian，LI Dongkai，ZHAO Baoyun. Damage evolution and acoustic emission character of coalrock under unloading condition[J]. Journal of Civil，Architectural and Environmental Engineering，2009，31(2)：57–61.(in Chinese)) [17] 尹光志，蒋长宝，王维忠，等. 不同卸围压速度对含瓦斯煤岩力学和瓦斯渗流特性影响试验研究[J]. 岩石力学与工程学报，2011，30(1)：68–77.(YIN Guangzhi，JIANG Changbao，WANG Weizhong，et al. Experimental study of influence of confining pressure unloading speed on mechanical properties and gas permeability of containing-gas coal rock[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(1)：68–77.(in Chinese)) [18] 蒋长宝，尹光志，黄启翔，等. 含瓦斯煤岩卸围压变形特征及瓦斯渗流试验[J]. 煤炭学报，2011，36(5)：802–807.(JIANG Changbao，YIN Guangzhi，HUANG Qixiang，et al. Experiment of deformation property and gas permeation of containing-gas coal under confining pressure unloading process[J]. Journal of China Coal Society，2011，36(5)：802–807.(in Chinese)) [19] 蒋长宝，黄滚，黄启翔. 含瓦斯煤多级式卸围压变形破坏及渗透率演化规律实验[J]. 煤炭学报，2011，36(12)：2 039–2 042. (JIANG Changbao，HUANG Gun，HUANG Qixiang. Experiment on deformation failure and permeability evolution law of gas- containing coal under multi-stage unloading confining pressure[J]. Journal of China Coal Society，2011，36(12)：2 039–2 042.(in Chinese)) [20] 黄启翔，尹光志，姜永东. 地应力场中煤岩卸围压过程力学特性试验研究及瓦斯渗透特性分析[J]. 岩石力学与工程学报，2010，29(8)：1 639–1 648.(HUANG Qixiang，YIN Guangzhi，JIANG Yongdong. Experimental study of mechanical characteristics of coal specimen in process of unloading confining pressure in geostress field and analysis of gas seepage characteristics[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(8)：1 639–1 648.(in Chinese)) [21] 吕有厂，秦虎. 含瓦斯煤岩卸围压力学特性及能量耗散分析[J]. 煤炭学报，2012，37(3)：1 505–1 510.(LU Youchang，QIN Hu. Investigation into mechanical responses and energy dissipation properties of coal containing methane to confinement unloading[J]. Journal of China Coal Society，2012，37(3)：1 505–1 510.(in Chinese)) [22] 刘恺德，刘泉声，朱元广，等. 考虑层理方向效应煤岩劈裂及单轴压缩试验研究[J]. 岩石力学与工程学报，2013，32(2)：308–316.(LIU Kaide，LIU Quansheng，ZHU Yuanguang，et al. Experimental study of coal considering directivity effect of bedding plane under brazilian splitting and uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(2)：308–316.(in Chinese)) [23] 吴俊. 突出煤的显微结构及表面特征研究[J]. 煤炭学报，1987，(2)：40–46.(WU Jun. Study on microstructure and surface features of coal prone to outburst[J]. Journal of China Coal Society，1987，(2)：40–46.(in Chinese)) [24] 中华人民共和国国家行业标准编写组. 煤和岩石物理力学性质测定方法[S]. 北京：中国煤炭工业协会，2010.(The Professional Standards Compilation Groups of the People?s Republic of China. Methods for determining the physical and mechanical properties of coal and rock[S]. Beijing：China National Coal Association，2010. (in Chinese)) [25] PATERSON M S，WONG T. Experimental rock deformation——the brittle filed[M]. Berlin Heidelberg：Springer-Verlag，2005：211–237. [26] 王子潮，王绳祖. 迁安石英岩脆延性转变特征及定量判据[J]. 长春地质学院学报. 1988，18(4)：391–400.(WANG Zichao，WANG Shengzu. From brittle to ductile transition behavior and quantitative criterion of Qianan quartzite[J]. Journal of Changchun University of Earth Sciences，1988，18(4)：391–400.(in Chinese)) [27] 朱杰兵. 高应力下岩石卸荷及其流变特性研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2009.(ZHU Jiebing. Study on unloading mechanics and its rheological properties of rock under high stress[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2009.(in Chinese)) [28] 卢兴利. 深部巷道破裂岩体块系介质模型及工程应用研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2010.(LU Xingli. Study on a model of blocks for cracked rock mass of deep roadway and its applications in engineering[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2010.(in Chinese)) [29] 胡云华. 高应力下花岗岩力学特性试验及本构模型研究[博士学位论文][D]. 武汉：中国科学院武汉岩土力学研究所，2008.(HU Yunhua. Study on mechanical properties of granites under high pressure conditions and its constitutive models[Ph. D. Thesis][D]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2008.(in Chinese)) [30] 姜永东，鲜学福，许江，等. 砂岩单轴三轴压缩试验研究[J]. 中国矿业，2004，(4)：68–71. (JIANG Yongdong，XIAN Xuefu，XU Jiang，et al. A research on sandstone uniaxial and triaxial compression tests[J]. China Mining Magazine，2004，(4)：68–71.(in Chinese)) [31] 苏现波，冯艳丽，陈江峰. 煤中裂隙的分类[J]. 煤田地质与勘探， 2002，30(4)：21–24.(SU Xianbo，FENG Yanli，CHEN Jiangfeng. The classification of fractures in coal[J]. Coal Geology and Exploration，2002，30(4)：21–24.(in Chinese)) [32] 杨起，韩德馨. 中国煤田地质学[M]. 北京：煤炭工业出版社，1979：22–54.(YANG Qi，HAN Dexin. China coalfield geology[M]. Beijing：Coal Industry Publishing House，1979：22–54.(in Chinese)) [33] 张子敏. 瓦斯地质学[M]. 徐州：中国矿业大学出版社，2009：146–158.(ZHANG Zimin. Gas geology[M]. Xuzhou：China University of Mining and Technology Press，2009：146–158.(in Chinese)) [34] 蔡美峰. 岩石力学与工程[M]. 北京：科学出版社，2002：219–228. (Cai Meifeng. Rock mechanics and engineering[M]. Beijing：Science Press，2002：219–228.(in Chinese)) [35] 陈慧发，SURREY A F. 弹性和塑性[M]. 北京：中国建筑工业出版社，2005：281–301.(CHEN Huifa，SURREY A F. Elasticity and plasticity[M]. Beijing：China Architecture and Building Press，2005：281–301.(in Chinese)) [36] 李新平，肖桃李，汪斌，等. 锦屏二级水电站大理岩不同应力路径下加卸载试验研究[J]. 岩石力学与工程学报，2012，31(5)：882–889.(LI Xinping，XIAO Taoli，WANG Bin，et al. Experimental study of Jinping II hydropower station marble under loading and unloading stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(5)：882–889.(in Chinese))