裂隙砂岩力学特性颗粒流数值模拟  

Numerical simulation of particle flow in mechanical properties of fractured sandstone

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作  者:牛双建[1,2,3] 张丁元 葛双双 杨大方 NIU Shuangjian;ZHANG Dingyuan;GE Shuangshuang;YANG Dafang(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Fujian Research Center for Tunneling and Urban Underground Space Engineering,Huaqiao University,Xiamen 361021,Fujian,China;Shenzhen Road and Bridge Construction Group Co.,Ltd.,Shenzhen 518028,Guangdong,China;School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China)

机构地区:[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]华侨大学隧道与城市地下空间工程研究中心,福建厦门361021 [3]深圳市路桥建设集团有限公司,广东深圳518028 [4]河南理工大学土木工程学院,河南焦作454000

出  处:《河南理工大学学报:自然科学版》2019年第2期129-135,共7页JOURNAL OF HENAN POLYTECHNIC UNIVERSITY

基  金:国家自然科学基金资助项目(51304068);中国博士后科学基金资助项目(2018M632574);福建省隧道与城市地下空间工程技术研究中心开放研究课题(17FTUE03).

摘  要:为了研究裂隙砂岩力学特性,利用颗粒流(PFC)软件构建含不同几何状态的裂隙试样模型,分析裂隙几何状态对裂隙试样力学特性和变形特性的影响。结果表明:相比于完整试样,裂隙试样的峰值强度、弹性模量、峰值轴向应变均有所降低,泊松比明显提高;裂隙试样峰值强度、弹性模量随着岩桥宽度的增加逐渐增加,随着岩桥倾角增加,裂隙试样弹性模量呈现先减小后增大的变化规律,当岩桥倾角与裂隙倾角相同时,裂隙试样的弹性模量、峰值强度最小;裂隙试样泊松比随着岩桥宽度、围压的增加逐渐降低,随着围压增加,裂隙试样峰值强度、峰值轴向应变逐渐增加;裂隙的存在弱化了试样的力学特性,改变了试样的变形特性,岩桥宽度越小,弱化能力越强,相比于岩桥宽度对裂隙试样的影响程度,岩桥倾角对试样的影响程度较小。In order to study mechanical properties of fractured sandstone,particle flow code(PFC)software was used to construct the fracture model with different geometric states.The effect of fracture geometry on the mechanical and deformation properties of fracture sample was analyzed.The results showed that compared with complete sample,the peak strength,elastic modulus and peak axial strain of fractured samples were reduced,while Poisson ratio was significantly improved.The peak strength and elastic modulus of fracture samples gradually increased with the increase of rock bridge width,however,along with the increase of rock bridge angle,the elastic modulus of the fractured samples decreased first and then increased.The elastic modulus and peak strength were the minimum when rock bridge angle was same as crack angle.The Poisson ratios of the fractured simples decreased gradually with the increase of width of rock bridge and confining pressure.Along with the increase of confining pressure,the peak strength and peak axial strain of the crack samples increased gradually.The existence of fractures weakened strength characteristics of the specimen and changed deformation characteristics of the samples.The smaller were the rock bridge widths,the stronger was the weakening ability of the sample.Compared with the effects of the width of the rock bridge on the fractured simples,the angle of the rock bridge had less effects on the specimen.

关 键 词:PFC 力学特性 岩桥倾角 岩桥宽度 围压 

分 类 号:TU457[建筑科学—岩土工程;建筑科学—土工工程]

 

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