基于VG-M模型的岩体单裂隙渗流特性分析  

Analysis on the seepage characteristics for single fracture in rock masses based on the VG-M model

作　　者：盛建龙[1,2] 周新 黄涛 杨博 SHENG Jianlong;ZHOU Xin;HUANG Tao;YANG Bo(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgical Mineral Resources,Wuhan Hubei 430081,China;Zhongnan Branch of Third Company of the Third Bureau of China Construction,Wuhan Hubei 430074,China;Second Construction Engineering Co.,Ltd.of the Third Bureau of China Construction.Wuhan Hubei 430074,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081 [3]中建三局三公司中南分公司,湖北武汉430074 [4]中建三局第二建设工程有限责任公司,湖北武汉430074

出　　处：《化工矿物与加工》2020年第7期27-32,共6页Industrial Minerals & Processing

基　　金：国家自然科学基金(联合基金)重点项目(U1802243);国家自然科学基金面上项目(41672317)。

摘　　要：为探究岩体非饱和单裂隙相对渗透系数与饱和度的数学关系,以及裂隙分形特征对非饱和渗流过程的影响,结合裂隙面形态的分形特性,并通过光滑平行板模型与流量平衡方程,提出了相对渗透系数与饱和度关系的数值分析方法。基于Van Genuchten模型与Mualem模型(VG-M模型)分析可知,采用数值模拟得到的相对渗透系数-饱和度函数关系与VG-M模型理论分析结果基本一致,表明用非饱和土的VG-M模型表征裂隙的非饱和渗透特性是合理的,并以某含断层的右岸边坡降雨条件下的稳定性分析验证了该结论。由不同分形维数下经验参数m1与m2的变化趋势可知,VG-M模型中参数m1与单裂隙粗糙程度呈正相关,参数m2在一定程度上表征单裂隙的隙宽分布特性,但具体的关系还有待进一步研究。In order to explore the mathematical relationship between relative permeability coefficient and saturation of unsaturated single fracture in rock mass and the influence of fracture fractal characteristics on unsaturated seepage process,a numerical analysis method of the relationship between relative permeability coefficient and saturation is proposed in combination with the fractal characteristics of fracture surface morphology and based on smooth parallel plate model and flow balance equation.On basis of Van Genuchten model and Mualem model(VG-M model),the results from the study make known that the relative permeability coefficient vs saturation function relation from numerical simulation is well consistent with that from VG-M model,which shows that it is reasonable to borrow the VG-M model of unsaturated soil to feature single fractures.This conclusion is verified by performing stability analysis on a right bank slope with fault under raining conditions.According to the variation trend of the empirical parameters m1 and m2 with different fractal dimensions,the parameter m1 for VG-M model represents positively correlation with the roughness of single fractures;the empirical parameter m2,to a certain extent,denotes the aperture distribution of single fractures,however the specific relationship is to be further studied.

关 键 词：非饱和渗流 隙宽分布 Van Genuchten-Mualem模型 相对渗透系数 分形维数 岩体单裂隙 饱和度 

分 类 号：TU45[建筑科学—岩土工程]