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基于修正立方定律对单裂隙辐射流剪切耦合的研究 预览

Study on shear coupling of single fracture radiation flow based on modified cubic law
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摘要 修正了辐射流立方定律,并研究了裂隙的力学性能和水力特性。进行了不同恒定法向压力和剪切速率下的高液压水头剪切渗流实验。发现峰值剪切强度随剪切速率的增加呈现先增大后减小的趋势。线性系数A和非线性系数B都随剪切位移先增大后减小,且减小后的稳定值小于剪切破坏前的值。但是系数B比系数A大5个数量级,变化幅度更大。临界雷诺数经剪切破坏后大于剪切破坏前的值,流态将变好。此外,剪切过程中的水力特性也表现出与力学性能相似的趋势。 The cubic law of radiation flow was corrected,and the mechanical properties and hydraulic characteristics of fracture were studied. High hydraulic head shear percolation experiments at different constant normal pressures and shear rates were performed. It was found that the peak shear strength increased first and then decreased with the increase of shear rate. The linear coefficient A and the nonlinear coefficient B exhibit a tendency to decrease as the shear displacement first increases and a decrease in the stable value smaller than the value before shear failure. However,the coefficient B is five orders of magnitude larger than the coefficient A,and the magnitude of the change is larger. The critical Reynolds number increases after shear failure to a value greater than that before shear failure,and the flow state will become better. In addition,the hydraulic properties during shearing also show a similar trend to mechanical properties.
作者 杨金宝 柴军瑞 许增光 覃源 YANG Jinbao;CHAI Junrui;XU Zengguang;QIN Yuan(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi'an University of Technology,Xi'an 710048,China)
出处 《水资源与水工程学报》 CSCD 2019年第1期217-225,231共10页 Journal of water resources and water engineering
基金 国家自然科学基金项目(51679197、51409206、51409208) 陕西省重点科技创新团队项目(2013KCT-015).
关键词 辐射流立方定律 线性系数 非线性系数 剪切速率 高液压水头 临界雷诺数 radiation flow cubic law linear coefficient nonlinear coefficient shear rate high hydraulic head critical Reynolds number
作者简介 杨金宝(1993-),男,江苏南京人,硕士研究生,主要从事水工渗流研究;通讯作者:柴军瑞(1968-),男,陕西西安人,教授,主要从事水工结构渗流力学研究
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