滇东黔西松软煤岩三轴压缩力学特性及能量演化特征
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摘要
为促进滇东黔西地区煤炭资源安全高效开发,开展了不同围压下的三轴压缩试验,研究了该地区松软煤岩的压缩力学特性及能量演化特征。研究结果表明:裂隙增大了松软煤岩差应力-应变曲线峰后下降的速率,差应力-体积应变曲线从峰前屈服阶段开始左拐,表现出扩容现象,达到峰值强度后扩容现象愈加明显;围压增强了煤岩承压能力,对煤岩压缩变形过程中径向变形的抑制作用明显;围压条件下,松软煤岩的抗压强度、破坏模式及破坏角均符合Coulomb强度准则;围压几乎不影响弹性能的增长速率,但提高了煤样储存弹性能的能力,受割理等裂隙影响,耗散能与围压无明确相关关系。
In order to promote the safe and efficient development of coal resource in eastern Yunnan and western Guizhou,the triaxial compression tests under different confining pressures were carried out,and the compression mechanical properties and energy evolution characteristics of soft coal and rock in this area were studied. The results showed that the fractures in the soft coal and rock increased the post-peak descending rate of the differential stress-strain curve,and the differential stress-volume strain curves turned left from the pre-peak yield stage,showing the dilatation phenomenon,which became more obvious after reaching the peak strength. The confining pressure enhanced the bearing capacity of coal and rock,and had obvious restraint effect on the radial deformation during the compression deformation process of coal and rock. Under the confining pressure,all the compressive strength,failure mode and failure angle of soft coal and rock met the Coulomb strength criterion. The confining pressure had almost no effect on the growth rate of elastic energy,but it improved the ability of coal samples to store the elastic energy. Under the influence of fractures such as cleats,there was no clear correlation between the dissipative energy and the confining pressure.
In order to promote the safe and efficient development of coal resource in eastern Yunnan and western Guizhou,the triaxial compression tests under different confining pressures were carried out,and the compression mechanical properties and energy evolution characteristics of soft coal and rock in this area were studied. The results showed that the fractures in the soft coal and rock increased the post-peak descending rate of the differential stress-strain curve,and the differential stress-volume strain curves turned left from the pre-peak yield stage,showing the dilatation phenomenon,which became more obvious after reaching the peak strength. The confining pressure enhanced the bearing capacity of coal and rock,and had obvious restraint effect on the radial deformation during the compression deformation process of coal and rock. Under the confining pressure,all the compressive strength,failure mode and failure angle of soft coal and rock met the Coulomb strength criterion. The confining pressure had almost no effect on the growth rate of elastic energy,but it improved the ability of coal samples to store the elastic energy. Under the influence of fractures such as cleats,there was no clear correlation between the dissipative energy and the confining pressure.
引文
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[2]王娟,戴凤威,方博.煤矿事故应急响应的风险决策研究[J].中国安全生产科学技术,2018,14(6):21-26.WANG Juan,DAI Fengwei,FANG Bo. Research on risk decisionmaking of emergency response to coal mine accidents[J]. Journal of Safety Science&Technology,2018,14(6):21-26.
[3]辛程鹏,张翔,杜锋,等.分段变速加载对含瓦斯突出煤力学特性影响试验研究[J].中国安全生产科学技术,2018,14(2):133-138.XIN Chengpeng,ZHANG Xiang,DU Feng,et al. Experimental study on influence of piecewise variable speed loading on mechanical properties of outburst coal containing gas[J]. Journal of Safety Science&Technology,2018,14(2):133-138.
[4]张民波,朱红青,吝曼卿,等.加卸载下含水率对含瓦斯煤岩损伤变形的影响分析[J].中国安全生产科学技术,2017,13(5):90-95.ZHANG Minbo,ZHU Hongqing,LIN Manqing,et al. Effect of moisture content on damage deformation of coal containing gas under loading and unloading conditions[J]. Journal of Safety Science&Technology,2017,13(5):90-95.
[5]张丹丹,冯雨实,李永臣,等.基于有限元软件的煤层气水平井井壁稳定数值模拟[J].煤矿安全,2018,49(3):144-147.ZHANG Dandan,FENG Yushi,LI Yongcheng,et al. Numerical simulation of wellbore stability for CBM horizontal well by finite element software[J]. Safety in Coal Mines,2018,49(3):144-147.
[6]章广成.复杂裂隙岩体等效力学参数及工程应用研究[D].武汉:中国地质大学,2008.
[7]崔聪,李宏艳,刘永茜,等.真三轴条件下等效围压对煤岩力学特性影响试验研究[J].煤炭科学技术,2018,46(5):47-53.CUI Cong,LI Hongyan,LIU Yongqian,et al. Experiment effect study of equivalent confining pressure on mechanical properties of coal and rock under condition of true three axis[J]. Coal Science&Technology,2018,46(5):47-53.
[8]任非.三轴压缩条件下煤岩力学特性及破坏模式[J].煤矿安全,2018,49(1):37-39.REN Fei. Mechanical properties and failure modes of coal and rock under triaxial compression[J]. Safety in Coal Mines. 2018,49(1):37-39.
[9]范铁刚,张广清,丁云宏,等.中阶煤有效弹性力学性质研究[J].岩土力学,2014,35(S2):204-210.FAN Tiegang,ZHANG Guangqing,DING Yunhong,et al. Research on effective elastic mechanical properties of medium rank coal[J]. Rock and Soil Mechanics. 2014,35(S2):204-210.
[10]唐辉明,张宜虎,孙云志.岩体等效变形参数研究[J].地球科学(中国地质大学学报),2007,32(3):389-396.TANG Huiming,ZHANG Yihu,SUN Yunzhi. A study of equivalent deformability parameters in rock masses[J]. Earth Science(Journal of China University of Geosciences). 2007,32(3):389-396.
[11]林峰,荣浩宇.松软煤体巴西劈裂试验研究及应用[J].煤矿安全,2017,48(5):61-63.LIN Feng,RONG Haoyu. Experimental study on soft coal Brazilian split and application[J]. Safety in Coal Mines,2017,48(5):61-63.
[12]雷毅.松软煤层井下水力压裂致裂机理及应用研究[D].北京:煤炭科学研究总院,2014.
[13]刘泉声,刘恺德,朱杰兵,等.高应力下原煤三轴压缩力学特性研究[J].岩石力学与工程学报,2014,33(1):24-34.LIU Quansheng,LIU Kaide,ZHU Jiebing,et al. Study of mechanical properties of raw coal under high stress with triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(1):24-34.
[14]尤明庆.岩样三轴压缩的破坏形式和Coulomb强度准则[J].地质力学学报,2002(2):179-185.YOU Mingqing. Destroy character and Coulomb criterion of rock specimen in pseudo triaxial compression[J]. Journal of Geomechanics,2002(2):179-185.
[15]张志镇,高峰.受载岩石能量演化的围压效应研究[J].岩石力学与工程学报,2015,34(1):1-11.ZHANG Zhizhen,GAO Feng. Confining pressure effect on rock energy[J]. Chinese Journal of Rock Mechanics&Engineering,2015,34(1):1-11.