西北水电Issue(4)：62-68,7.DOI:10.3969/j.issn.1006-2610.2024.04.011
双江口水电站花岗岩单轴压缩微观破坏机制研究
Study on Micro Failure Mechanism of Granite under Uniaxial Compression
摘要
Abstract
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.关键词
花岗岩/Voronoi/微观结构/神经网络反演/离散元/破坏机制Key words
granite/voronoi/microstructure/neural network inversion/discrete element/failure mechanism分类
建筑与水利引用本文复制引用
裴书锋,郝文锋,王营利,王一汀,曾凤娟..双江口水电站花岗岩单轴压缩微观破坏机制研究[J].西北水电,2024,(4):62-68,7.基金项目
河南省自然科学基金项目(202300410269) （202300410269）
中国电建集团成都勘测设计研究院有限公司科技项目(CD2C20210540). （CD2C20210540）
