非贯通裂隙岩体的单轴压缩颗粒流数值模拟
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摘要
通过颗粒流数值模拟带预制裂隙岩样的单轴压缩破裂过程,分析2组裂隙之间的错开程度对岩样破裂过程中的裂纹扩展规律及机制的影响。结果表明,裂隙间不同错开程度的岩样中的破裂模式大致相同,主要产生剪切裂纹和张拉裂纹,两者相互贯通将岩样大致分成4块;颗粒位移方向的变化是内部裂纹萌生和扩展的直观响应;岩样在压裂过程中大致可分为弹性阶段、峰前裂纹的萌生及稳定扩展阶段、峰后裂纹快速扩展失稳阶段;压裂破坏过程中产生的总能量,一部分储存于颗粒内部,一部分散失,裂纹萌生之时恰是耗散能增加之时。
Based on the particle flow numerical simulation of uniaxial compression rupture process of prefabricated fractured rock samples, the influences of fracture dislocation degree of two sample groups on crack growth law and mechanism during rupture process are analyzed. The results show that, (a) the rupture modes of rock samples with different fracture dislocation degrees are almost the same, mainly producing shear cracks and tensile cracks, and the inter-connection of two kinds of cracks divides the rock sample into four pieces; (b) the change of particle displacement direction is the direct response of crack initiation and propagation; (c) the fracturing process of rock sample can be roughly divided into the elastic stage, the initiation and stable growth stage of pre-peak crack, and the instability stage of post-peak crack rapid expansion; and (d) the total energy produced during fracturing is partly stored in particles and partly lost, and the dissipation energy increases when the crack is formed.
Based on the particle flow numerical simulation of uniaxial compression rupture process of prefabricated fractured rock samples, the influences of fracture dislocation degree of two sample groups on crack growth law and mechanism during rupture process are analyzed. The results show that, (a) the rupture modes of rock samples with different fracture dislocation degrees are almost the same, mainly producing shear cracks and tensile cracks, and the inter-connection of two kinds of cracks divides the rock sample into four pieces; (b) the change of particle displacement direction is the direct response of crack initiation and propagation; (c) the fracturing process of rock sample can be roughly divided into the elastic stage, the initiation and stable growth stage of pre-peak crack, and the instability stage of post-peak crack rapid expansion; and (d) the total energy produced during fracturing is partly stored in particles and partly lost, and the dissipation energy increases when the crack is formed.
引文
[1]王元汉,苗雨,李银平.预制裂纹岩石压剪试验的数值模拟分析[J].岩石力学与工程学报,2004,23(18):3113-3116.
[2]周瑜,刘冰,王莉,等.单轴压缩条件下含双圆孔类岩石试样力学特性的细观研究[J].岩石力学及工程学报,2017,36(11):2662-2671.
[3]邓清海,巩林贤,薛永强,等.基于颗粒流的带中心孔巴西圆盘试样裂纹扩展分析[J].河南理工大学学报:自然科学版,2016,35(6):869-875.
[4]CUNDALL P A.A computer model for simulating progressive large scale movements in blocky rock systems[C]∥Proceedings of the Symposium on Rock Fracture.Nancy:International Society of Rock Mechanics,1971:2-8.
[5]CUNDALL P A,STRAEK O D L.A discrete numerical model for granular assemblies[J].Geotechnique,1979,29(1):47-65.
[6]周健,池永,池毓蔚,等.颗粒流方法及PFC2D程序[J].岩土力学,2000,21(3):271-274.
[7]ZHANG X P,WONG L N Y.Crack initiation,propagation and coalescence in rock-like material containing two flaws:a numerical study based on bonded-particle model approach[J].Rock Mechanics and Rock Engineering,2013,46(5):1001-1021.
[8]王伟超,刘希亮,王利,等.预制裂纹盐岩单轴力学特性及能量机制试验[J].重庆大学学报,2016,39(5):103-113.
[9]刘华伟,杨晨.闭合与非闭合裂隙岩石单轴压缩的颗粒流细观分析[J].水电能源科学,2016,34(1):131-135.
[10]杜贻腾,李延春,张仕林,等.单轴压缩载荷下不同倾角三维通透裂隙扩展机理研究[J].山东科技大学学报:自然科学版,2016,35(3):53-60.
[11]王辉,高召宁,孟祥瑞,等.单裂隙岩石在单轴压缩下破坏的数值模拟[J].煤矿安全,2015,46(1):29-32.
[2]周瑜,刘冰,王莉,等.单轴压缩条件下含双圆孔类岩石试样力学特性的细观研究[J].岩石力学及工程学报,2017,36(11):2662-2671.
[3]邓清海,巩林贤,薛永强,等.基于颗粒流的带中心孔巴西圆盘试样裂纹扩展分析[J].河南理工大学学报:自然科学版,2016,35(6):869-875.
[4]CUNDALL P A.A computer model for simulating progressive large scale movements in blocky rock systems[C]∥Proceedings of the Symposium on Rock Fracture.Nancy:International Society of Rock Mechanics,1971:2-8.
[5]CUNDALL P A,STRAEK O D L.A discrete numerical model for granular assemblies[J].Geotechnique,1979,29(1):47-65.
[6]周健,池永,池毓蔚,等.颗粒流方法及PFC2D程序[J].岩土力学,2000,21(3):271-274.
[7]ZHANG X P,WONG L N Y.Crack initiation,propagation and coalescence in rock-like material containing two flaws:a numerical study based on bonded-particle model approach[J].Rock Mechanics and Rock Engineering,2013,46(5):1001-1021.
[8]王伟超,刘希亮,王利,等.预制裂纹盐岩单轴力学特性及能量机制试验[J].重庆大学学报,2016,39(5):103-113.
[9]刘华伟,杨晨.闭合与非闭合裂隙岩石单轴压缩的颗粒流细观分析[J].水电能源科学,2016,34(1):131-135.
[10]杜贻腾,李延春,张仕林,等.单轴压缩载荷下不同倾角三维通透裂隙扩展机理研究[J].山东科技大学学报:自然科学版,2016,35(3):53-60.
[11]王辉,高召宁,孟祥瑞,等.单裂隙岩石在单轴压缩下破坏的数值模拟[J].煤矿安全,2015,46(1):29-32.