文献类型：期刊文献

中文题名：粗糙单裂隙渗透性尺寸效应及其影响因素研究

英文题名：Study on size effect of permeability of single rough fracture and its corresponding influencing factors

作者：钟振[1,2];闫金秀[1,2];徐从强[2];颜真光[2];胡云进[1,2];高超[1,2];郜会彩[1,2]

机构：[1]浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000;[2]绍兴文理学院土木工程学院,浙江绍兴312000

年份：2021

卷号：52

期号：4

起止页码：192

中文期刊名：水利水电技术（中英文）

收录：CSTPCD、、北大核心、北大核心2020

基金：国家自然科学基金资助项目(41977256);浙江省公益技术应用国际科技合作领域项目(LGJ20E090001);绍兴文理学院国家科技合作资助项目(2019LGGH1008)。

语种：中文

中文关键词：粗糙单裂隙;渗透系数;尺寸效应;临界尺寸;影响因素

外文关键词：rough single fracture;permeability coefficient;size effect;critical size;influencing factor

中文摘要：裂隙岩体渗透性尺寸效应是岩体水力学研究中的一个热点问题。为探明岩体渗透性随试样尺寸的演变规律及其主控因素,从粗糙单裂隙入手,首先假定裂隙开度服从正态分布,并用COMSOL数值分析软件生成系列尺寸的粗糙单裂隙模型;然后通过求解Reynolds方程,开展变裂隙开度、粗糙度和法向应力条件下的系列尺寸单裂隙渗透数值模拟,并通过双曲线函数建立法向应力与裂隙开度之间的相关关系,间接模拟应力对单裂隙渗流的影响。数值模拟结果表明:粗糙单裂隙的渗透性存在明显的尺寸效应,其渗透系数先随试样尺寸的增加而增加,随后趋于稳定,模拟获得的临界尺寸介于12~15 m之间。通过进一步的参数敏感性分析揭示:临界尺寸与裂隙开度呈负相关关系,裂隙开度越大,渗透性临界尺寸越小,而与粗糙度和法向应力则呈正相关关系;并且相较于法向应力和裂隙粗糙度,裂隙开度对单裂隙渗透性临界尺寸的影响更显著。

外文摘要：The size effect of permedility of froctured rock is a hot topic in the rock hydraulic mechanism.In order to explore the law of the evolution of rock mass permeability with the sample size and its dominate factors,rock fracture opening is assumed to be subject to the normal distribution through starting from the single rough fracture at first,and then the rough single fracture models with a series of sizes are generated by means of the numerical analysis software—COMSOL.Afterwards,the numerical simulations on the variable crack opening and roughness as well as the permeabilities of the single fractures with a series of sizes under the normal stress condition are carried out,while the correlative relation between the normal stress and the fracture opening is built up through the relevant hyperbolic function for indirectly simulating the influence from the stress on the seepage of the single fracture.The numerical simulation results show that obvious size effect is there for the permeability of the rough single fracture,while the permeability coefficient increases with the increase of the sample size at first and then tends to be stable,for which the critical size obtained from the simulation is between 12 m and 15 m.From the further parametric sensitivity analysis,it is revealed that the critical size is negatively related to the fracture opening,namely,the larger the fracture opening is,the smaller the critical size of the permeability is to be.However,it is positively related to both the roughness and the normal stress.Moreover,the influence from the fracture opening on the critical size of the permeability of the single fracture is more significant if compared with those from the normal stress and the fracture roughness.