摘要
针对岩土材料细观力学数值模拟结果与宏观力学试验验证之间缺乏相关试验设备的现状,在考虑岩土材料非均匀性的同时,研制了可与工业CT配套使用的岩土材料间接拉伸强度测定仪。该仪器中,试件做成环状。在环状试件的内壁施加径向压应力时,试样在环向方向产生拉应力。试验时,当内壁压力大到一定值后试样破坏,对试验数据进行分析,可以得到试样的抗拉强度。同时,采用抗拉强度较弱的压实黄土进行试验验证,并与传统的抗拉强度试验进行对比分析。利用第四代设备与工业CT配套,初步开展了不同粘弹性沥青胶结颗粒材料不同破损阶段的拉伸测试。
利用数字图像技术对粘弹性岩土材料CT图像进行了处理,并在此基础上建立了考虑微观结构和非均匀性的有限元模型。通过有限元分析计算,初步实现了在考虑微观结构的同时,利用不同组成的力学性能作为输入参数,预测试件整体力学性能的虚拟仿真模型,对于开发基于虚拟仿真模型的设计、评价起到积极的作用。利用所研制的间接拉伸强度测定设备,为进一步开展岩土材料拉伸变形力学性能试验与虚拟力学性能仿真验证奠定了基础。
A new set of indirect tensile strength tester (IDT) for geomaterial is developed,with the consideration of inhomogeneity of the inner structure of the samples, the ring samples are made for the tester. During test process,the radial compressive stress is applied on the inner side the sample and the tensile stress is generated along the tangential direction. After analyzing the test data, the tensile strength of the specimen can be obtained. The samples made of loess are used to verify the developed tester. The test results show that the test results from the developed tester are consistent very well with the traditional test method. The tensile test with asphalt mix samples are carried out with the developed indirect tensile strength tester and different loading stages are scanned with ICT successfully.
With digital image processing method, the Computerized tomography image of asphalt concrete are transfer to finite element method,with which the micro-structure and non-uniformity of the asphalt concrete can be considered in the calculation. The mechanical parameters of different composites of asphalt concrete sample are input as calculation parameters. The mechanical response of the whole sample can be estimated through the FEM model on the basis of CT image process,the calculation results show that method presented can be a potential virtual simulation test for predication of mechanical response of geomaterial. The indirect tensile strength tester which we developed can be foundation for contrasting of virtual test simulations and real experiments.
引文
[1]党进谦.单轴土工拉伸仪的研制[J].水利水电科技进展,2001,21(5):31-32
[2]黄文熙,《土的工程性质》[M].水利电力出版社,1983
[3]葛修润,任建喜,蒲毅彬,等.岩石疲劳损伤扩展规律CT细观分析初探[J].岩土工程学报,2001,(02):45~51
[4]葛修润,任建喜,蒲毅彬,等.煤岩三轴细观损伤演化规律的CT动态试验[J].岩石力学与工程学报,1999,(05):158~161
[5]葛修润,任建喜,蒲毅彬,等.岩石细观损伤扩展规律的CT实时试验[J].中国科学E辑:技术科学,2000,(02) :541~550
[6]陈正汉,卢再华,蒲毅彬.非饱和土三轴仪的CT机配套及其应用[J].岩土工程学报,2001,(04) :67~72
[7]杨更社,刘慧.基于CT图像处理技术的岩石损伤特性研究[J].煤炭学报,2007,(05)
[8]杨更社,谢定义,张长庆,等.岩石损伤特性的CT识别[J].岩石力学与工程学报,1996,(01):33~41
[9]岳中琦.岩土工程材料的数字图像有限元分析[J].岩石力学与工程学报,2004, 23(6):889～897
[10]骆亚生,邢义川.黄土的抗拉强度[J].陕西水力发电,1998,14(4):6–10
[11]Schlangen E,Van Mier JGM.Experimental and numericalanalysis of micromechanisms of fracture of cement-basedcomposites. Cement and Concrete Composites,1992,14:105–118
[12]徐文杰,胡瑞林,岳中琦.基于数字图像处理的土石混合体细观结构[J].辽宁工程技术大学学报(自然科学版),2008,(1):51~53
[13]王士民.细观非均匀性对脆性岩石材料宏观破坏形式的影响[J].岩土力学,2006,27(2)
[14] Z.Q. Yue, S. Chen, L.G. Tham.Finite element modeling of geomaterials using digital image processing,Computers and Geotechnics ,2003,(30) :375–397
[15]陈沙,岳中琦,等.基于数字图像的非均质岩土工程材料的数值分析方法[J].岩土工程学报,2005,(08):956~963
[16]李晓军.路基填土抗拉强度测定的试验研究[J].西安公路交通大学学报,2000,20(2):20-22
[17]李晓军.基于CT图像处理技术的岩土材料有限元模型[J].岩土力学,2006,27(08)
[18]李晓军.路基填土破损过程的细观识别与破损参数测定[D].西安公路交通大学博士学位论文,1999
[19]魏善斌,剑万禧.岩石试件抗拉强度的套筒致裂法试验研究[J].西安矿业学院学报,1996,16(3):235-238
[20]贾坚.室内水泥土抗拉强度的测试方法及若干探讨[J].上海地质,1999,(2):48–59
[21]张少宏.三轴拉伸试验技术研究[J].西北水资源与水工程,2001,12(2):24-27
[22]刘菀茹.轴压法测定黏性土抗拉强度的若干问题探讨[J].水电站设计,2005,21(2):69-71
[23]李积彦.粘性土抗拉强度试验对比研究[J].路基工程,2007,2(131):104-105
[24]张志强,鲜学福.用带中心孔巴西圆盘试样测定岩石断裂韧度的研究[J].重庆大学学报,1998,21(2):68-74
[25]孟祥跃.软煤拉伸应力-应变关系的试验研究[J].力学学报,1997,29(5):582-584
[26]李守存.黄土抗拉特性研究[D].西北农林科技大学硕士学位论文,2005,5-10
[27]李云安,葛修润等,岩-土-混凝土破坏准则及其强度参数估算[J].岩石力学与工程学报,2004,23(5):770~776
[28]朱安龙.粘性土抗拉强度试验研究及数值模拟[D].四川大学硕士学位论文,2005,5-9
[29]赵寿刚.石灰土的工程特性试验研究[J].工程勘察,2007,(02)
[30]李巨文.水泥土抗拉强度的室内试验分析[J].河北建筑科技学院学报,1998,15(01)
[31]吴良平.粗粒土组构试验研究[D].长江科学院硕士学位论文,2007
[32]郭进英.沥青路面结构材料的均匀性及其影响[J].公路交通科技,1997,14(02)
[33]谢定义,齐吉琳.土结构性及其定量化参数研究的新途径[J].岩土工程学报,2000,(04):581~589
[34]徐文杰,岳中琦.基于数字图像的土、岩和混凝土内部结构定量分析和力学数值计算的研究进展[J].工程地质学报,2007,(03):289~313
[35]吕光印,郝培文.沥青混合料抗拉性能试验研究及力学特性分析[J].公路,2008,(15):400~403
[36]吕光印,郝培文.沥青混合料半圆弯曲试验力学特性数值分析[J].武汉理工大学学报,2008,30(03):15~25
[37]徐文杰,胡瑞林,岳中琦.基于数字图像分析及大型直剪试验的土石混合体块石含量与抗剪强度关系研究[J].岩石力学与工程学报,2008,27(05):996~1007
[38]陈沙,岳中琦,谭国焕.基于真实细观结构的岩土工程材料三维数值分析方法[J].岩石力学与工程学报,2006,25(10):1951~1959
[39]徐文杰,胡瑞林,岳中琦,等.土石混合体细观结构及力学特性数值模拟研究[J].岩石力学与工程学报,2007,26(02):300~315
[40]岳中琦.岩土细观介质空间分布数字表述和相关力学数值分析的方法、应用和进展[J].岩石力学与工程学报,2006,25(05):875~888
[41] YANG Sheng-feng,YANG Xin-hua,CHEN Chuan-yao.Simulation of rheological behavior of asphalt mixture with lattice model.J. Cent. South Univ. Technol,2008,15(s1): 155?157
[42] Qingli Dai,Zhanping You.Micromechanical ?nite element framework for predicting viscoelastic properties of asphalt mixtures.Materials and Structures,2008,41:1025–1037
[43]Zhanping You and Qingli Dai,Dynamic complex modulus predictions of hot-mix asphalt using a micromechanical-based finite element model,Can.J.Civ.Eng,2007,34:1519-1528
[44]Qingli Dai,Zhanping You,and Martin H.Sadd,A Micromeahanical viscoelasto-plastic model for asphalt mixture.Asphalt Concrete,2006
[45]Laith Tashman,Eyad Masad,Dallas Little,Hussein Zbib.A microstructure-based viscoplastic model for asphalt concrete.International Journal of Plasticity,2005, (21): 1659–1685
[46]Zhanping You,Qingli Dai,Bardan Gurung.Development and implementation of a finite element model for asphalt mixture to predict compressive complex moduli at low and intermediate temperatures.Asphalt Concrete,2006
[47]S. Chen,Z.Q. Yue,L.G. Tham.Digital image-based numerical modeling method for prediction of inhomogeneous rock failure.International Journal of Rock Mechanics & Mining Sciences,2004,(41):939–957
[48]Barzin Mobasher,Michael S,Mamlouk,Evaluation of crack propagation properties of asphalt mixtures.Journal of transportation engineering,1997
[49]A. R. Abbas,A. T. Papagiannakis,M.ASCE,E. A. Masad,M.ASCE.Linear and Nonlinear Viscoelastic Analysis of the Microstructure of Asphalt Concretes. Journal of materlals in civil engineering,2004
[50]S. Chen,Z.Q. Yue,L.G. Tham,P.K.K. Lee.Modeling of the indirect tensile test for inhomogeneous granite using a digital image-based numerical method.International Journal of Rock Mechanics & Mining Sciences,2004,(41):447
[51]Qingli Dai,Zhanping You.Prediction of Creep Stiffness of Asphalt Mixture with Micromechanical Finite-Element and Discrete-Element Models.Journal of engineering mechanics ? asce,2007
[52]C.C. Xia,Z.Q. Yue,L.G. Tham,C.F. Lee,Z.Q. Sun.Quantifying topography and closure deformation of rock joints.International Journal of Rock Mechanics & Mining Sciences,2003 (40):197–220
[53]Bing Zhang.Digital Test of Composite Material Using X-Ray Tomography and Finite Element Simulation.Dissertation submitted to the faculty of Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Civil Engineering,2007
[54]郝书亮,党发宁,陈厚群,等.基于CT图像的混凝土三维微观结构在ANSYS中的实现[J].混凝土,2009,(03):
[55]刘文彬.圆环试样内径对抗拉强度的影响[J].岩土工程技术,2004,18(6):286-288
[56]L.B.Wang,J.D.Frost Naga Shashidhar.Microstructure Study of WestTrack Mixes from X-ray Tomography Images.TRB 80th Annual Meeting,2001(2632) Washington DC
[57]叶永,杨新华,陈传尧.沥青砂粘弹性模型参数的试验研究[J].中外公路,2009,29(04):192~194
