不同频率载荷作用下的岩石节理本构模型
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摘要
用Instron1342材料试验机对表面含二、三、四锯齿状人工节理试样进行4种不同频率载荷下的动态压缩试验。通过对试验结果的分析,获得加载频率和表面形态对节理闭合变形性质的影响规律。通过5种常用函数方程对节理动态压缩试验数据的拟合,发现用幂函数模型来描述人工节理动态压缩闭合变形性质较好。根据试验数据,得出模型参数与载荷频率之间的关系,从而建立考虑率效应的节理本构模型,并进行试验验证。
Dynamic compression tests of different loading frequencies on artificial joints with different saw-teeth are performed by Instron1342 servo-controlled material testing machine.Based on the analysis of test results,the effect of both the surface topography and loading frequency on the joint closure behavior is discussed.By comparison of the fitting potential of five empirical functions with the closure curves of rock joints under normal loads with different frequencies,it is suggested that the power function is very suitable for expressing the dynamic closure behavior of the joints.By analyzing the quantitative relations between the fitting parameters of power function and strain rates,a new dynamic constitutive model of rock joints is proposed.The test results show that the established model gives reasonable estimations of the deformation behavior of joints under dynamic loads.
Dynamic compression tests of different loading frequencies on artificial joints with different saw-teeth are performed by Instron1342 servo-controlled material testing machine.Based on the analysis of test results,the effect of both the surface topography and loading frequency on the joint closure behavior is discussed.By comparison of the fitting potential of five empirical functions with the closure curves of rock joints under normal loads with different frequencies,it is suggested that the power function is very suitable for expressing the dynamic closure behavior of the joints.By analyzing the quantitative relations between the fitting parameters of power function and strain rates,a new dynamic constitutive model of rock joints is proposed.The test results show that the established model gives reasonable estimations of the deformation behavior of joints under dynamic loads.
引文
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[17]CAI J G,ZHAO J,LI H B.Effects of loading rate on fracture normal behavior[C]//WANG S J,FU B J,LI Z K ed.Frontiers of Rock Mechanics and Sustainable Development in the 21st Century.Rotterdam:A.A.Balkema,2001:1 997–2 000.
[18]YOSHIOKA N.A review of the micromechanical approach to the physics of contacting surfaces[J].Tectonophysics,1997,277:29–40.
[2]KUMSAR H,AYDAN O,ULUSAY R.Dynamic and static stability assessment of rock slopes against wedge failures[J].Rock Mechanics and Rock Engineering,2000,33(1):31–51.
[3]陈健云,胡志强,林皋.超大型地下洞室群的三维地震响应分析[J].岩土工程学报,2001,23(4):494–498.(CHEN Jianyun,HU Zhiqiang,LIN Gao.3D seismic response study on large scale underground group caverns[J].Chinese Journal of Geotechnical Engineering,2001,23(4):494–498.(in Chinese))
[4]张继春.三峡工程基岩爆破振动特性的试验研究[J].爆炸与冲击,2001,21(2):131–137.(ZHANG Jichun.Vibration characteristics of blasting in bed rock mass at the Three Gorges Project[J].Explosion and Shock Waves,2001,21(2):131–137.(in Chinese))
[5]Itasca Consulting Group,Inc..Three-dimensional distinct element code:optional features[R].Minneapolis:Itasca Consulting Group,Inc.,2003.
[6]古德曼R E.不连续岩体中的地质工程方法[M].北方交通大学隧道与地质教研室译.北京:中国铁道出版社,1980.(GOODMAN R E.Methods of geological engineering in discontinuous rocks[M].Translated by Staff Room of Tunnel and Geology,Northern Jiaotong University.Beijing:China Railway Publishing House,1980.(in Chinese))
[7]BANDIS S C,LUMSDEN A C,BARTON N R.Fundamentals of rock joint deformation[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1983,20(6):249–268.
[8]BARTON N R,BANDIS S C,BAKHTAR K.Strength,deformation and conductivity coupling of rock joints[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1985,22(3):121–140.
[9]COOK N G W.Natural joints in rock:mechanical,hydraulic and seismic behavior and properties under normal stress[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1992,29(3):198–223.
[10]孙宗颀.不连续面应力变形性质研究[J].岩石力学与工程学报,1987,6(4):287–300.(SUN Zongqi.A study on stress and deformation properties of discontinuous planes[J].Chinese Journal of Rock Mechanics and Engineering,1987,6(4):287–300.(in Chinese))
[11]XIA C C,YUE Z Q,THAM L G,et al.Quantifying topography and closure deformation of rock joints[J].International Journal of Rock Mechanics and Mining Sciences,2003,40(2):197–220.
[12]夏才初.岩石表面形貌学与节理力学研究[博士学位论文][D].长沙:中南工业大学,1992.(XIA Caichu.Surface topography and mechanics of rock joints[Ph.D.Thesis][D].Changsha:Central South University of Technology,1992.(in Chinese))
[13]夏才初,孙宗颀.工程岩体节理力学[M].上海:同济大学出版社,2002.(XIA Caichu,SUN Zongqi.Engineering rock mass joints mechanics[M].Shanghai:Tongji University Press,2002.(in Chinese))
[14]BANDIS S C,LUMSDEN A C,BARTON N.R.Fundamentals of rock joint deformation[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1983,20(6):249–268.
[15]SUN Z.Fracture mechanics and tribology of rocks and rock joints[Ph.D.Thesis][D]Lulea:Lulea University of Technology,1983.
[16]MALAMA B,KULATILAKE P H S W.Models for normal fracture deformation under compressive loading[J].International Journal of Rock Mechanics and Mining Sciences,2003,40(6):893–901.
[17]CAI J G,ZHAO J,LI H B.Effects of loading rate on fracture normal behavior[C]//WANG S J,FU B J,LI Z K ed.Frontiers of Rock Mechanics and Sustainable Development in the 21st Century.Rotterdam:A.A.Balkema,2001:1 997–2 000.
[18]YOSHIOKA N.A review of the micromechanical approach to the physics of contacting surfaces[J].Tectonophysics,1997,277:29–40.
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