文献类型：期刊文献

中文题名：岩体裂隙网络非线性渗流特性研究

英文题名：Nonlinear seepage behaviors of fluid in fracture networks

作者：刘日成[1,2];蒋宇静[2,3];李博[4];蔚立元[1];杜岩[5]

机构：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116;[2]长崎大学,日本长崎8528521;[3]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590;[4]绍兴文理学院土木工程学院,浙江绍兴312000;[5]北京科技大学土木与环境工程学院,北京100083

年份：2016

卷号：37

期号：10

起止页码：2817

中文期刊名：岩土力学

外文期刊名：Rock and Soil Mechanics

收录：CSTPCD、、北大核心2014、ESCI(收录号：WOS:000407787400011)、EI(收录号：20164202916314)、CSCD2015_2016、Scopus(收录号：2-s2.0-84991087111)、WOS、北大核心、CSCD

基金：This work was supported by the National Basic Research Project of China (973 Program) (2013CB36003) and the National Natural Science Foundation of China (51379117, 51579239, 41427802).

语种：中文

中文关键词：离散裂隙网络;非线性渗流;Navier-Stokes方程;局部立方定律

外文关键词：discrete fracture network; nonlinear seepage; Navier-Stokes equations; local cubic law

中文摘要：基于人工交叉裂隙模型,通过室内透水试验,利用电荷耦合元件(CCD)照相机可视化技术,对流体在裂隙交叉点内的非线性流动特性进行研究。建立两种离散裂隙网络(DFN)模型,考虑两种边界条件,改变模型进口和出口之间的压力,直接求解Navier-Stokes(简称N-S)方程,对DFN的非线性渗流特性进行研究。结果表明,室内试验可以观测到与出口3相连的裂隙单元内发生了明显的非线性流动,且通过模型的流量Q和模型两端的压力P具有非线性关系。数值计算结果也表明,在水力梯度J较大时(比如J>0.1),通过DFN的Q和P具有非线性关系,而当J较小时(比如J<10-4),Q与P线性相关;根据文中的算例,建议利用局部立方定律求解DFN内每条裂隙的渗流特性的临界条件为J≤10-4;裂隙表面粗糙会造成通过DFN渗流量的降低,但对相对流量误差的影响可忽略不计。

外文摘要：Fluid flow tests are conducted on an artificial model constituted by two crossed fractures with an intersecting angle of 90°. The nonlinear fluid flow patterns within the fracture intersection are observed by using the visualization technique with a charge-coupled device（CCD） camera. Two discrete fracture network（DFN） models are established with and without considering the fracture surface roughness, respectively. The nonlinear flow behaviors of fluid in these two DFN models are characterized by directly solving the Navier-Stokes equations under two kinds of boundary conditions. Experimental results show that the obvious nonlinear flow behaviors in the segment connected to outlet_3 are observed, and measurements also exhibit a nonlinear correlation between the flow rate Q and pressure P. Numerical results demonstrate that, when the hydraulic gradient J is to some extent high（i.e., J 0.1）, the flow rate Q through the DFN is nonlinearly related to the pressure P between two opposite boundaries. However, when J is relatively low（i.e., J 10^（-4））, Q is linearly proportional to P. Based on these two DFN models in the current study, the critical condition of applying the local cubic law to calculate fluid flow in every fracture in the DFNs is J ≤10^（-4）. The fracture surface roughness can significantly influence the permeability of the DFNs, however, it has negligible influences on the relative flow rate errors.