水-岩相互作用对砂岩劣化效应的离散元模拟
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摘要
以三峡库区消落带典型砂岩为研究对象,通过室内单轴压缩试验来获得水-岩作用对岩样的力学性质的劣化规律,并利用PFC2D离散元软件模拟单轴试验应力-应变曲线与室内水-岩作用试验曲线相符合的方式,来研究水-岩作用下三峡库区典型砂岩的微观力学参数的变化规律,揭示水-岩作用下岩石宏观力学性质的劣化机理.结果表明:在长期水-岩作用下,PFC2D数值模拟的细观参数变化规律与室内试验岩石的宏观力学参数的劣化规律基本一致;模拟得出的应力-应变曲线与室内试验结果匹配良好;数值试样的破坏模式变化规律性与室内试验的也完全一致.说明PFC2D数值模拟能够很好地模拟水-岩作用对砂岩的劣化效应,并反应岩石真实的劣化规律,同时也验证了水-岩作用对砂岩的劣化效应的显著性.
The typical sandstones in the water-level-fluctuating zone of the Three Gorges Reservoir are taken as the research object.In order to obtain the influence law of water-rock interaction on the mechanical properties of rock samples,the uniaxial compression test is conducted in the laboratory.The PFC2 Ddiscrete element software is used to simulate indoor uniaxial compression test;and the simulated stress-strain curve is made,it is consistent with the laboratory test curve.The variation of the microscopic mechanical parameters of sandstone is analyzed by the discrete element method.And the mechanism of deterioration of mesoscopic mechanical properties of rock under water-rock interaction is explained in this way.The results show:The variation of mesoscopic parameters of PFC2 Dnumerical simulation is basically consistent with the degradation of macroscopic mechanical parameters of rock in laboratory tests;simulated stress-strain curves match well with laboratory test results;and the failure mode of the numerical sample is also completely consistent with the laboratory test.It can be concluded that the PFC2 Dnumerical simulation can well simulate the influence of water-rock interaction on sandstone degradation.It also verifies the significance of influence of water-rock interaction on the sandstone degradation.
The typical sandstones in the water-level-fluctuating zone of the Three Gorges Reservoir are taken as the research object.In order to obtain the influence law of water-rock interaction on the mechanical properties of rock samples,the uniaxial compression test is conducted in the laboratory.The PFC2 Ddiscrete element software is used to simulate indoor uniaxial compression test;and the simulated stress-strain curve is made,it is consistent with the laboratory test curve.The variation of the microscopic mechanical parameters of sandstone is analyzed by the discrete element method.And the mechanism of deterioration of mesoscopic mechanical properties of rock under water-rock interaction is explained in this way.The results show:The variation of mesoscopic parameters of PFC2 Dnumerical simulation is basically consistent with the degradation of macroscopic mechanical parameters of rock in laboratory tests;simulated stress-strain curves match well with laboratory test results;and the failure mode of the numerical sample is also completely consistent with the laboratory test.It can be concluded that the PFC2 Dnumerical simulation can well simulate the influence of water-rock interaction on sandstone degradation.It also verifies the significance of influence of water-rock interaction on the sandstone degradation.
引文
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[3]Hassanzadegan A,Bl9cher G,Milsch H,et al.The Effects of Temperature and Pressure on the Porosity Evolution of Flechtinger Sandstone[J].Rock Mechanics&Rock Engineering,2014,47(2):421-434.
[4]周杰,汪永雄,周元辅.基于颗粒流的砂岩三轴破裂演化宏-细观机理[J].煤炭学报,2017,42(s1):76-82.
[5]刘新荣,李栋梁,张梁,等.干湿循环对泥质砂岩力学特性及其微细观结构影响研究[J].岩土工程学报,2016,38(7):1291-1300.
[6]Williams J R,Rege N.The Development of Circulation Cell Structures in Granular Materials Undergoing Compression[J].Power Technology,1997,90:187-194.
[7]尹成.岩石拉压实验的颗粒离散元模拟[D].成都:西南交通大学,2014.
[8]Potyondy D O.A Flat-Jointed Bonded-Particle Material for Hard Rock[C]//Proceedings of the 46th Rock Mechanics/Geomechanics Symposium,Chicago,American Rock Mechanics Association,2012.
[9]Hao S W,Wang H Y,Xia M F,et al.Relationship Between Strain Localization and Catastrophic Rupture[J].Theoretical and Applied Fracture Mechanics,2007,48(1):41-49.