交叉节理类岩石裂隙扩展规律研究
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摘要
交叉节理是岩体工程中普遍存在的一种不连续体,其裂隙扩展对岩体工程的安全具有重要的影响,研究交叉节理类岩石裂隙扩展规律,可为岩体工程安全施工和稳定性分析提供参考依据。文章基于相似理论,以砂岩为原型,通过多组配比试验选配抗压强度为1∶1的类岩石试件,并分别对单、双X型节理试件进行单轴压缩试验,研究单向加载条件下交叉节理的裂隙扩展规律,采用非连续变形分析方法(DDARF)对裂隙扩展过程进行数值模拟,并与室内试验进行对比。结果表明:单X型节理岩体裂隙扩展会以某一条节理为起裂节理,并沿起裂节理迅速扩展,释放能量达到新的平衡;对于双X型节理岩体,某组X型节理会起主控作用,直到试件破坏。DDARF可以较好地模拟裂隙的扩展路径,与室内试验相辅相成,共同揭示交叉节理的裂隙扩展规律。
Cross joint is a common kind of discontinuities which exists in rock mass, and its crack propagation has great influence on rock engineering's security. Study on the crack propagation of cross jointed rock mass can provide reference for the safety construction and stability analysis in rock engineering. Based on the similarity theory, with sandstone as the prototype, multi-mix ratio tests are carried out and finally the rock-like specimens with the compressive strength of 1∶1 are made. Uniaxial compressive tests of single X jointed specimens and double X jointed specimens are carried out respectively, and the crack propagation laws of cross joints under uniaxial loading are studied. At the same time, the crack propagation process is numerically simulated by the discontinuous deformation analysis method DDARF, and the simulation results are compared with the laboratory tests. Results show that, during the cross jointed rock-like specimens' cracking process, some joint or some set of X joints are acted as the initiation one for cracking, and along which propagate quickly, release energy until reach a new equilibrium; the discontinuous deformation analysis method can well simulate the crack propagation, together with the laboratory tests to reveal the crack propagation law of cross jointed rock mass.
Cross joint is a common kind of discontinuities which exists in rock mass, and its crack propagation has great influence on rock engineering's security. Study on the crack propagation of cross jointed rock mass can provide reference for the safety construction and stability analysis in rock engineering. Based on the similarity theory, with sandstone as the prototype, multi-mix ratio tests are carried out and finally the rock-like specimens with the compressive strength of 1∶1 are made. Uniaxial compressive tests of single X jointed specimens and double X jointed specimens are carried out respectively, and the crack propagation laws of cross joints under uniaxial loading are studied. At the same time, the crack propagation process is numerically simulated by the discontinuous deformation analysis method DDARF, and the simulation results are compared with the laboratory tests. Results show that, during the cross jointed rock-like specimens' cracking process, some joint or some set of X joints are acted as the initiation one for cracking, and along which propagate quickly, release energy until reach a new equilibrium; the discontinuous deformation analysis method can well simulate the crack propagation, together with the laboratory tests to reveal the crack propagation law of cross jointed rock mass.
引文
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[22] 焦玉勇,张秀丽,刘泉声,等.用非连续变形分析方法模拟岩石裂纹扩展[J].岩石力学与工程学报,2007,26(4):682-691.
[2] Kumar R,Verma A K.Anisotropic shear behavior of rock joint replicas[J].International Journal of Rock Mechanics and Mining Sciences,2016,90:62-73.
[3] Resende R,Muralha J,Ramos A L,et al.Rock joint topography:three-dimensional scanning and numerical analysis[J].Geotechnique Letters,2015,5(4):318-323.
[4] Le H K,Huang W C,Liao M C,et al.Spatial characteristics of rock joint profile roughness and mechanical behavior of a randomly generated rock joint[J].Engineering Geology,2018,245:97-105.
[5] 李露露,高永涛,周喻,等.单轴压缩条件下含三叉裂隙类岩石试样力学特性的细观研究[J].岩土力学,2018,39(10):3668-3676.
[6] Liu X W,Liu Q S,Liu B,et al.Failure behavior for rocklike material with cross crack under biaxial compression[J].Journal of Materials in Civil Engineering,2019,31(2):06018025.
[7] Cao R H,Cao P,Lin H,et al.Experimental and numerical study of the failure process and energy mechanisms of rock-like materials containing cross un-persistent joints under uniaxial compression[J].PLOS ONE,2017,12(12):1-20.
[8] 张波,李术才,杨学英,等.含交叉多裂隙类岩石材料单轴压缩力学性能研究[J].岩石力学与工程学报,2015,34(9):1777-1785.
[9] 张波,李术才,杨学英,等.含交叉裂隙岩体相似材料试件力学性能单轴压缩试验[J].岩土力学,2012,33(12):3674-3679.
[10] 张波,李术才,杨学英,等.含交叉裂隙节理岩体单轴压缩破坏机制研究[J].岩土力学,2014,35(7):1863-1870.
[11] 张波,李术才,杨学英,等.含交叉裂隙节理岩体锚固效应及破坏模式[J].岩石力学与工程学报,2014,33(5):996-1003.
[12] Sarfarazi V,Haeri H,Marji M F.Numerical simulation of the effect of bedding layer on the tensile failure mechanism of rock using PFC2D[J].Structural Engineering and Mechanics,2019,69(1):43-50.
[13] 桑盛,刘卫群,宋良,等.岩体交叉裂隙水流分配特性研究[J].实验力学,2016,31(5):577-583.
[14] 李晓春,陈剑平,石丙飞,等.交叉裂隙渗流无网格法初探[J].岩土力学,2007,28(s1):371-374.
[15] 王聪超.交叉裂隙岩样渗透特性试验研究[D].石家庄:石家庄铁道大学,2016.
[16] 刘日成,蒋宇静,李树忱,等.交叉裂隙水力学开度的计算及非线性水力特性研究[J].岩土力学,2015,36(6):1581-1590.
[17] Wu W,Zhu H H,Lin J S,et al.Tunnel stability assessment by 3D DDA-key block analysis[J].Tunnelling and Underground Space Technology,2018,71:210-214.
[18] Zhang Y B,Xu Q,Chen G Q,et al.Extension of discontinuous deformation analysis and application in cohesive-frictional slope analysis[J].International Journal of Rock Mechanics & Mining Sciences,2014,70:533-545.
[19] Gony Y B,Yossef H H.Benchmarking the numerical Discontinuous Deformation Analysis method[J].Computers and Geotechnics,2016,71:30-46.
[20] 张秀丽.断续节理岩体破坏过程的数值分析方法研究[D].武汉:中国科学院武汉岩土力学研究所,2007.
[21] 焦玉勇,张秀丽,李廷春.模拟节理岩土破坏全过程的DDARF方法[M].北京:科学出版社,2010.
[22] 焦玉勇,张秀丽,刘泉声,等.用非连续变形分析方法模拟岩石裂纹扩展[J].岩石力学与工程学报,2007,26(4):682-691.