不同岩性下TBM滚刀破岩过程离散元分析
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摘要
为了研究全断面岩石掘进机(TBM)的滚刀在不同岩性下的破岩机理,将考虑胶结尺寸的微观接触模型植入离散元软件,模拟了4种岩性下不同滚刀刃数的破岩过程,探究岩性、滚刀刃数对破岩效率的影响。模拟结果表明:不同滚刀刃数下的破岩过程可以分为3个阶段,即加载阶段、卸载阶段及残余跃进阶段;胶结破坏类型主要呈拉剪破坏与压剪破坏两种;滚刀破岩过程中受到的阻力可以用峰值法向推力表示,阻力大小取决于岩性,破岩阻力随着岩石单轴抗压强度的增大而增大;通过胶结破岩比能耗来评价破岩效率,对于坚硬岩,三滚刀破岩效率最高,对于强度较低的岩石,采用单滚刀破岩效率更高。
In order to investigate the rock failure mechanism using the TBM disc cutters under different lithologies,the micro contact model considering bond size was implanted into the discrete element software,which to simulate the rock breaking process with different cutter points under four lithologies. The influences of the cutter points and different lithologies on the effect of rock breaking efficiency were investigated. The simulation results showed that the rock failure process under different cutter points can be divided into three stages: loading stage,unloading stage and residual leaping stage. Bond failure mode can be divided into two modes: tensile shearing failure mode and compressive shearing failure mode. The mean resistance of the cutters on rock failure process can be expressed by the peak normal force. It depends on the lithologies and increases with the increasing of the rock compressive strength. The rock breaking efficiency is evaluated by the bond breaking specific energy. For hard rock mass,the three-point cutters have the highest rock breaking efficiency,and it is more efficient to use single-point cutter for lower strength rock mass.
In order to investigate the rock failure mechanism using the TBM disc cutters under different lithologies,the micro contact model considering bond size was implanted into the discrete element software,which to simulate the rock breaking process with different cutter points under four lithologies. The influences of the cutter points and different lithologies on the effect of rock breaking efficiency were investigated. The simulation results showed that the rock failure process under different cutter points can be divided into three stages: loading stage,unloading stage and residual leaping stage. Bond failure mode can be divided into two modes: tensile shearing failure mode and compressive shearing failure mode. The mean resistance of the cutters on rock failure process can be expressed by the peak normal force. It depends on the lithologies and increases with the increasing of the rock compressive strength. The rock breaking efficiency is evaluated by the bond breaking specific energy. For hard rock mass,the three-point cutters have the highest rock breaking efficiency,and it is more efficient to use single-point cutter for lower strength rock mass.
引文
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[23]吕品.锦屏水电站绿片岩段扩挖及落底开挖稳定研究[D].大连:大连理工大学,2011.
[24]CIANTIA M O,CASTELLANZA R,PRISCO C D. Experimental study on the water-induced weakening of calcarenites[J]. Rock Mechanics and Rock Engineering,2015,48(2):441-461.
[25]PARMA M,NOVA R. Effects of bond crushing on the settlements of shallow foundations on soft rocks[J].Géotechnique,2011,61(3):247-261.
[26]JIANG M J,KONRAD J M,LEROUEIL S. An efficient technique for generating homogeneous specimens for DEM studies[J]. Computers and Geotechnics,2003,30(7):579-597.
[27]INNAURATO N,OGGERI C,ORESTE P P,et al. Experimental and numerical studies on rock Breaking with TBM tools under high stress confinement[J]. Rock Mechanics and Rock Engineering,2007,40(5):429-451.
[28]袁聚云,蒋明镜,廖优斌,等.全断面隧道掘进机滚刀破岩尺寸效应离散元分析[J].同济大学学报(自然科学版),2017,45(10):1437-1445.
[29]SANIO H P. Prediction of the performance of disc cutters in anisotropic rock[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1985,22(3):153-161.
[30]MOON T,OH J. A study of optimal rock-cutting conditions for hard rock TBM using the discrete element method[J]. Rock Mechanics and Rock Engineering,2012,45(5):837-849.
[31]谭青,张逸超,夏毅敏,等. TBM盘形滚刀切削饱水岩石试验研究[J].浙江大学学报(工学版),2017,51(5):914-921.
[2]NISHIMATSU Y. The mechanics of rock cutting[C]//International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts. Pergamon,1972,9(2):261-270.
[3]YANG Haiqing,WANG He,ZHOU Xiaoping. Analysis on the damage behavior of mixed ground during TBM cutting process[J]. Tunnelling and Underground Space Technology,2016,57:55-65.
[4] CUNDALL P,STRACK O. A discrete numerical model for granular assemblies[J]. Geotechnique,1979,29(1):47-65.
[5]GONG Q M,ZHAO J,HEFNY A M. Numerical simulation of rock fragmentation process induced by two TBM cutters and cutter spacing optimization[J]. Tunnelling and Underground Space Technology incorporating Trenchless Technology Research,2006,21(3):263-263.
[6]GONG Q M,ZHAO J,JIAO Y Y. Numerical modeling of the effects of joint orientation on rock fragmentation by TBM cutters[J]. Tunnelling and Underground Space Technology,2005,20(2):183-191.
[7]GONG Q M,JIAO Y Y,ZHAO J. Numerical modelling of the effects of joint spacing on rock fragmentation by TBM cutters[J]. Tunnelling and Underground Space Technology,2006,21(1):46-55.
[8]HUANG H,LECAMPION B,DETOURNAY E. Discrete element modeling of tool-rock interaction I:rock cutting[J]. International Journal for Numerical and Analytical Methods in Geomechanics,2013,37(13):1913-1929.
[9] JIANG Mingjing,LIAO Youbin,WANG Huaning,et al.Distinct element method analysis of jointed rock fragmentation induced by TBM cutting[J]. European Journal of Environmental and Civil Engineering,2017(7):1-20.
[10]谭青,张魁,周子龙,等.球齿滚刀作用下岩石裂纹的数值模拟与试验观测[J].岩石力学与工程学报,2010,29(1):163-169.
[11]谭青,易念恩,夏毅敏,等. TBM滚刀破岩动态特性与最优刀间距研究[J].岩石力学与工程学报,2012,31(12):2453-2464.
[12]谭青,李建芳,夏毅敏,等.盘形滚刀破岩过程的数值研究[J].岩土力学,2013,34(9):2707-2714.
[13]谭青,朱逸,夏毅敏,等.节理特征对TBM盘形滚刀破岩特性的影响[J].中南大学学报自然科学版,2013b,44(10):4040-4046.
[14]谭青,张旭辉,夏毅敏,等.不同围压与节理特征下盘形滚刀破岩数值研究[J].煤炭学报,2014,39(7):1220-1228.
[15]孙亚. TBM破岩机理及深埋节理岩层破岩规律离散元分析[D].上海:同济大学,2016.
[16] JIANG M J,YU H S,HARRIS D. Bond rolling resistance and its effect on yielding of bonded granulates by DEM analyses[J]. International Journal for Numerical and Analytical Methods in Geomechanics,2006,30(8):723-761.
[17]JIANG M J,YU H S,HARRIS D. A novel discrete model for granular material incorporating rolling resistance[J].Computers and Geotechnics,2005,32(5):340-357.
[18]陈贺.岩石宏微观力学特性及高陡岩质边坡的离散元数值模拟[D].上海:同济大学,2013.
[19]蒋明镜,孙亚,王华宁,等.全断面隧道掘进机破岩机理离散元分析[J].同济大学学报(自然科学版),2016,44(7):1038-1044.
[20]中华人民共和国建设部.岩土工程勘察规范(2009年版):GB 500212001[S].北京:中国建筑工业出版社,2009.
[21] MARTIN D C. The strength of massive Lac du Bonnet Granite around underground opeanings[D]. Winnipeg:University of Manitoba,1993.
[22]黄书岭.高应力下脆性岩石的力学模型与工程应用研究[D].武汉:中国科学院研究生院,2008.
[23]吕品.锦屏水电站绿片岩段扩挖及落底开挖稳定研究[D].大连:大连理工大学,2011.
[24]CIANTIA M O,CASTELLANZA R,PRISCO C D. Experimental study on the water-induced weakening of calcarenites[J]. Rock Mechanics and Rock Engineering,2015,48(2):441-461.
[25]PARMA M,NOVA R. Effects of bond crushing on the settlements of shallow foundations on soft rocks[J].Géotechnique,2011,61(3):247-261.
[26]JIANG M J,KONRAD J M,LEROUEIL S. An efficient technique for generating homogeneous specimens for DEM studies[J]. Computers and Geotechnics,2003,30(7):579-597.
[27]INNAURATO N,OGGERI C,ORESTE P P,et al. Experimental and numerical studies on rock Breaking with TBM tools under high stress confinement[J]. Rock Mechanics and Rock Engineering,2007,40(5):429-451.
[28]袁聚云,蒋明镜,廖优斌,等.全断面隧道掘进机滚刀破岩尺寸效应离散元分析[J].同济大学学报(自然科学版),2017,45(10):1437-1445.
[29]SANIO H P. Prediction of the performance of disc cutters in anisotropic rock[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1985,22(3):153-161.
[30]MOON T,OH J. A study of optimal rock-cutting conditions for hard rock TBM using the discrete element method[J]. Rock Mechanics and Rock Engineering,2012,45(5):837-849.
[31]谭青,张逸超,夏毅敏,等. TBM盘形滚刀切削饱水岩石试验研究[J].浙江大学学报(工学版),2017,51(5):914-921.
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