首页|双江口水电站花岗岩单轴压缩微观破坏机制研究

双江口水电站花岗岩单轴压缩微观破坏机制研究

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为研究双江口水电站花岗岩微观结构、矿物组分对其变形破坏特征的影响,首先开展了花岗岩的单轴压缩试验,分析了花岗岩的特征应力、特征应变及破坏形态,并通过SEM扫描分析其破裂机制,采用Voronoi多边形模拟花岗岩的微观结构,通过块体离散元模拟单轴压缩破坏过程,基于正交设计-数值模拟-神经网络-智能反演方法得到花岗岩矿物间接触的力学参数.结果表明:花岗岩单轴压缩试验破坏模式是拉-剪复合破坏,主破裂角为 60°~70°,晶间破坏主要发生在石英与斜长石接触间,两者颗粒间接触的法向刚度、切向刚度和粘聚力显著影响了花岗岩宏观力学指标.通过数值试验和室内试验得到的花岗岩破裂形态、宏观力学参数基本一致,采用神经网络反演用于微观力学参数识别较为合理,拓宽了微观力学试验的应用前景.
Study on Micro Failure Mechanism of Granite under Uniaxial Compression
In order to study the effect of the microstructure and mineral composition of granite on its deformation and failure characteristics in Shuangjiangkou Hydropower Station,uniaxial compression test of granite is carried out to analyze the characteristic stress,characteristic strain and failure form of granite,and the fracture mechanism is analyzed by SEM scanning.The microstructure of granite is simulated by Voronoi polygon,and the uniaxial compression failure process is simulated by discrete elements of block.The mechanical parameters of granite mineral contact are obtained based on orthogonal design-numerical simulation-neural network-intelligent inversion method.The results show that the failure mode of granite under uniaxial compression test is tensile-shear compound failure,and the main fracture angle is 60°~70°.The intergranular failure main-ly occurs in the contact between quartz and plagioclase.The normal stiffness,tangential stiffness and cohesion of the contact between quartz and plagioclase significantly affect the macroscopic mechanical indexes of granite.The fracture morphology and macroscopic mechanical parameters of granite obtained by numerical test and laboratory test are basically consistent,which proves the rationality of using neural network inversion to i-dentify micromechanical parameters,and broadens the application prospect of micromechanical tests.

granitevoronoimicrostructureneural network inversiondiscrete elementfailure mechanism

裴书锋、郝文锋、王营利、王一汀、曾凤娟

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华北水利水电大学 地球科学与工程学院,郑州 450046

华北水利水电大学地质灾害防控研究所,郑州 450046

中国建筑第七工程局有限公司,郑州 450000

花岗岩 Voronoi 微观结构 神经网络反演 离散元 破坏机制

河南省自然科学基金项目中国电建集团成都勘测设计研究院有限公司科技项目

202300410269CD2C20210540

2024

西北水电
西北勘测设计研究院

西北水电

影响因子:0.388
ISSN:1006-2610
年,卷(期):2024.(4)