岩石粗糙裂隙非线性渗流特性试验研究

发布时间：2018-03-14 17:50

本文选题：粗糙裂隙　切入点：法向荷载　出处：《地下空间与工程学报》2017年01期 　论文类型：期刊论文

【摘要】：通过开展岩石单裂隙不同粗糙起伏、水力梯度及法向荷载作用下的非线性渗流特性室内试验,研究了裂隙非线性渗流特征与发生机制,建立了考虑裂隙几何形貌的临界雷诺数Rec模型。研究结果表明:随着裂隙试样两端的水力梯度逐渐增大,裂隙内水流流态从线性流向非线性流转变,过流流量(Q)与水力梯度(#P)的实测数据可以很好地用Forchheimer方程拟合;随着法向荷载的增大,Forchheimer方程线性项系数A增加了2~4个数量级,非线性项系数B增加了3~5个数量级;在建立的以水力开度eh为基本变量的非线性系数B参数化表达式基础上,首次提出了定量表征裂隙非线性渗流发生条件的临界雷诺数Rec模型。
[Abstract]:In this paper, the nonlinear seepage characteristics and mechanism of fracture are studied through laboratory tests of nonlinear seepage characteristics of rock under different rough fluctuations, hydraulic gradient and normal load. A critical Reynolds number Rec model considering the geometric morphology of fractures is established. The results show that with the increase of hydraulic gradient at both ends of fracture specimens, the flow state of water flows in fractures changes from linear to nonlinear flow. With the increase of normal load, the linear term coefficient A of the Forchheimer equation increases by 2 ~ 4 orders of magnitude, and the nonlinear term coefficient B increases by 3 ~ 5 orders of magnitude. Based on the parameterized expression of nonlinear coefficient B with hydraulic opening eh as the basic variable, a critical Reynolds number Rec model for quantificationally characterizing the occurrence conditions of nonlinear seepage in fractures is proposed for the first time.
【作者单位】：武汉理工大学资源与环境工程学院;武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金(51609184,51609184) 中国博士后科学基金(2015M580672) 水资源与电工程科学国家重点实验室开放基金(2015SGG02)
【分类号】：TU45

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