不同侧压碎煤充填样品单轴压缩变形特征试验分析
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摘要
侧压作用碎煤体变形特征复杂,通过对2组14个破碎煤体试件进行相同粒径不同初始侧压与不同粒径相同初始侧压作用下压缩变形试验,分析了侧压作用破碎煤体压缩变形轴向应力-应变曲线特征,确定了初始侧压、碎煤粒径对碎煤轴向变形及变形历时影响,研究了变化侧压与轴向应变关系。结果表明:随着轴向应力增加,碎煤应变呈增加趋势,初始侧压越大,碎煤轴向应力-应变曲线越光滑,碎煤轴向应变与变形历时越小,初始侧压与碎煤轴向应变、变形历时呈负指数关系;而随着碎煤粒径增大,碎煤轴向应力-应变曲线斜率与平滑程度减小,碎煤粒径与碎煤轴向变形、变形历时分别呈线性与指数增加趋势;随着碎煤轴向应变增加,变化侧压表现出增大趋势,初始侧压越大,碎煤变化侧压-轴向应变关系曲线斜率越小,而碎煤粒径越大,碎煤变化侧压-轴向应变曲线斜率越大,曲线加速趋势越明显,合理初始侧压对碎煤变形控制作用显著。
The deformation of broken coal mass is complex in lateral pressure. Tests on compression deformation have been operated on two groups of fourteen broken-coal specimens in same diameter and different initial lateral pressure, and in different diameter and same initial lateral pressure, respectively.The axial stress-strain curves of broken-coal compression deformation in lateral pressure have been an alyzed, the effects of initial lateral pressure, broken-coal diameter, on axial deformation and deformation time have been determined, and the relationship between dynamic lateral pressure and axial strain has been studied. The results have shown that, as the axial stress increases, the strain of crushed coal in creases; the larger the initial lateral pressure, the smoother the axial stress-strain curve of the crushed coal; when the axial strain and deformation duration of the crushed coal is smaller, the initial lateral pressure will have a negative exponential relationship with the axial strain and deformation of the crushed coal. With the increase of the particle size of the broken coal, the slope and smoothness of the axial stress-strain curve of the crushed coal are reduced. The particle size of the crushed coal and the axial deformation and deformation of the crushed coal are linear and exponentially increasing respectively. As the axial strain of the broken coal increases, the change of the lateral pressure will show an increasing trend. The larger the initial lateral pressure, the smaller the slope of the lateral pressure-axial strain curve of the broken coal. The larger the particle size of the broken coal, the larger the slope of the lateral pressure-axial strain curve of the broken coal, and the more obvious the curve acceleration trend,and the reasonable initial lateral pressure has a significant effect on the control of the broken coal. The control of initial reasonable lateral pressure over broken-coal deformation was significant.
The deformation of broken coal mass is complex in lateral pressure. Tests on compression deformation have been operated on two groups of fourteen broken-coal specimens in same diameter and different initial lateral pressure, and in different diameter and same initial lateral pressure, respectively.The axial stress-strain curves of broken-coal compression deformation in lateral pressure have been an alyzed, the effects of initial lateral pressure, broken-coal diameter, on axial deformation and deformation time have been determined, and the relationship between dynamic lateral pressure and axial strain has been studied. The results have shown that, as the axial stress increases, the strain of crushed coal in creases; the larger the initial lateral pressure, the smoother the axial stress-strain curve of the crushed coal; when the axial strain and deformation duration of the crushed coal is smaller, the initial lateral pressure will have a negative exponential relationship with the axial strain and deformation of the crushed coal. With the increase of the particle size of the broken coal, the slope and smoothness of the axial stress-strain curve of the crushed coal are reduced. The particle size of the crushed coal and the axial deformation and deformation of the crushed coal are linear and exponentially increasing respectively. As the axial strain of the broken coal increases, the change of the lateral pressure will show an increasing trend. The larger the initial lateral pressure, the smaller the slope of the lateral pressure-axial strain curve of the broken coal. The larger the particle size of the broken coal, the larger the slope of the lateral pressure-axial strain curve of the broken coal, and the more obvious the curve acceleration trend,and the reasonable initial lateral pressure has a significant effect on the control of the broken coal. The control of initial reasonable lateral pressure over broken-coal deformation was significant.
引文
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[14]孙强,段发兵,谢和平.煤体爆破破碎分维评价方法的研究[J].岩石力学与工程学报,2000,19(4):505-508.SUN Qiang,DUAN Fabing,XIE Heping.Study on fractal dimension evaluation measurement of coal rock blasting[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(4):505-508.
[15]褚廷湘,李品,晁江坤,等.承压破碎煤体碎胀系数演变特征与机制[J].煤炭学报,2017,42(12):3182-3188.CHU Tingxiang,LI Pin,CHAO Jiangkun,et al.Bulking coefficient evolution characteristics and mechanism of compacted broken coal[J].Journal of China Coal Society,2017,42(12):3182-3188.
[16]邓涛,杨林德,韩文峰.加载方式对大理岩碎块分布影响的试验研究[J].同济大学学报(自然科学版),2007,35(1):10-14.DENG Tao,YANG Linde,HAN Wenfeng.Influence of loading form on distribution of marble fragments[J].Journal of Tongji University(Nature Science),2007,35(1):10-14.
[17]冯梅梅,吴疆宇,陈占清,等.连续级配饱和破碎岩石压实特性试验研究[J].煤炭学报,2016,41(9):2195-2202.FENG Meimei,WU Jiangyu,CHEN Zhanqing,et al.Experimental study on the compaction of saturated broken rock of continuous gradation[J].Journal of China Coal Society,2016,41(9):2195-2202.
[18]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):3003-3010.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):3003-3010.
[19]郑西贵,姚志刚,张农.掘采全过程沿空掘巷小煤柱应力分布研究[J].采矿与安全工程学报,2012,29(4):459-465.ZHENG Xigui,YAO Zhigang,ZHANG Nong.Stress distribution of coal pillar with gob-side entry driving in the process of excavation&mining[J].Journal of Mining&Safety Engineering,2012,29(4):459-465.
[20]马振乾,姜耀东,宋红华,等.构造破碎区沿空掘巷偏应力分布特征与控制技术[J].采矿与安全工程学报,2017,34(1):24-31.MA Zhenqian,JIANG Yaodong,SONG Honghua,et al.Distribution characteristics of deviatoric stress and control technology of gob-side entry driving in structure fracture zone[J].Journal of Mining&Safety Engineering,2017,34(1):24-31.
[2]马占国,缪协兴,陈占清,等.破碎煤体渗透特性的试验研究[J].岩土力学,2009,30(4):985-988.MA Zhanguo,MIAO Xiexing,CHEN Zhanqing,et al.Experimental study of permeability of broken coal[J].Rock and Soil Mechanics,2009,30(4):985-988.
[3]苏承东,顾明,唐旭,等.煤层顶板破碎岩石压实特征的试验研究[J].岩石力学与工程学报,2012,31(1):18-26.SU Chengdong,GU Ming,TANG Xu,et al.Experiment study of compaction characteristics of crushed from coal seam roof[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(1):18-26.
[4]许江,陆漆,吴鑫,等.不同颗粒粒径下型煤孔隙及发育程度分形特征[J].重庆大学学报,2011,34(9):81-88.XU Jiang,LU Qi,WU Xin,et al.The fractal characteristics of the pore and development of briquettes with different coal particle size[J].Journal of Chongqing University,2011,34(9):81-88.
[5]缪协兴,黄艳利,巨峰,等.密实充填采煤的岩层移动理论研究[J].中国矿业大学学报,2012,41(6):863-867.MIAO Xiexing,HUANG Yanli,JU Feng,et al.Strata movement theory of dense backfill mining[J].Journal of China University of Mining&Technology,2012,41(6):863-867.
[6]殷伟,缪协兴,张吉雄,等.矸石充填与垮落法混合综采技术研究与实践[J].采矿与安全工程学报,2016,33(5):845-852.YIN Wei,MIAO Xiexing,ZHANG Jixiong,et al.Research on mixed mining technology with backfilling and caving methods[J].Journal of Mining&Safety Engineering,2016,33(5):845-852.
[7]张振南,缪协兴,葛修润.松散岩块压实破碎规律的试验研究[J].岩石力学与工程学报,2005,24(3):451-455.ZHANG Zhennan,MIAO Xiexing,GE Xiurun.Testing study on compaction breakage of loose rock blocks[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(3):451-455.
[8]邓军,徐通模,王华,等.巷道煤体破碎程度的模糊综合评判[J].煤炭学报,2003,28(2):145-148.DENG Jun,XU Tongmo,WANG Hua,et al.Fuzzy determination of coal size around roadway[J].Journal of China Coal Society,2003,28(2):145-148.
[9]姜永东,郑权,刘浩,等.煤体破碎能的实验研究[J].矿业安全与环保,2013,40(3):13-16.JIANG Yongdong,ZHENG Quan,LIU Hao,et al.Experimental study on breaking energy of coal mass[J].Mining Safety&Environmental Protection,2013,40(3):13-16.
[10]郭臣业,鲜学福,吴轩洪,等.岩石破碎功、坚固性系数、强度关系的实验研究[J].重庆建筑大学学报,2008,30(6):28-31.GUO Chenye,XIAN Xuefu,WU Xuanhong,et al.The relationship among rock crushing energy,the protodyakonov coefficient and rock strength[J].Journal of Chongqing Jianzhu University,2008,30(6):28-31.
[11]杜晶,李夕兵,宫凤强,等.岩石冲击实验碎屑分类及其分形特征[J].矿业研究与开发,2010,30(5):20-22.DU Jing,LI Xibing,GONG Fengqiang,et al.Classification and fractal characteristics of the fragments from impacting experiment of rock[J].Mining R&D,2010,30(5):20-22.
[12]李国华,陶兴华.动、静载岩石破碎比功实验研究[J].岩石力学与工程学报,2004,23(14):2448-2454.LI Guohua,TAO Xinghua.Testing study on crushing work ratio of rock under dynamic and static load[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(14):2448-2454.
[13]黄达,谭清,黄润秋.高围压卸荷条件下大理岩破碎块度分形特征及其与能量相关性研究[J].岩石力学与工程学报,2012,31(7):1379-1389.HUANG Da,TAN Qing,HUANG Runqiu.Fractal characteristics of fragmentation and correlation with energy of marble under unloading with high confining pressure[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(7):1379-1389.
[14]孙强,段发兵,谢和平.煤体爆破破碎分维评价方法的研究[J].岩石力学与工程学报,2000,19(4):505-508.SUN Qiang,DUAN Fabing,XIE Heping.Study on fractal dimension evaluation measurement of coal rock blasting[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(4):505-508.
[15]褚廷湘,李品,晁江坤,等.承压破碎煤体碎胀系数演变特征与机制[J].煤炭学报,2017,42(12):3182-3188.CHU Tingxiang,LI Pin,CHAO Jiangkun,et al.Bulking coefficient evolution characteristics and mechanism of compacted broken coal[J].Journal of China Coal Society,2017,42(12):3182-3188.
[16]邓涛,杨林德,韩文峰.加载方式对大理岩碎块分布影响的试验研究[J].同济大学学报(自然科学版),2007,35(1):10-14.DENG Tao,YANG Linde,HAN Wenfeng.Influence of loading form on distribution of marble fragments[J].Journal of Tongji University(Nature Science),2007,35(1):10-14.
[17]冯梅梅,吴疆宇,陈占清,等.连续级配饱和破碎岩石压实特性试验研究[J].煤炭学报,2016,41(9):2195-2202.FENG Meimei,WU Jiangyu,CHEN Zhanqing,et al.Experimental study on the compaction of saturated broken rock of continuous gradation[J].Journal of China Coal Society,2016,41(9):2195-2202.
[18]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):3003-3010.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):3003-3010.
[19]郑西贵,姚志刚,张农.掘采全过程沿空掘巷小煤柱应力分布研究[J].采矿与安全工程学报,2012,29(4):459-465.ZHENG Xigui,YAO Zhigang,ZHANG Nong.Stress distribution of coal pillar with gob-side entry driving in the process of excavation&mining[J].Journal of Mining&Safety Engineering,2012,29(4):459-465.
[20]马振乾,姜耀东,宋红华,等.构造破碎区沿空掘巷偏应力分布特征与控制技术[J].采矿与安全工程学报,2017,34(1):24-31.MA Zhenqian,JIANG Yaodong,SONG Honghua,et al.Distribution characteristics of deviatoric stress and control technology of gob-side entry driving in structure fracture zone[J].Journal of Mining&Safety Engineering,2017,34(1):24-31.