几何粗糙对岩体裂隙非线性流动的影响机制

发布时间：2018-06-12 05:29

本文选题：裂隙粗糙 + 非线性流动　；参考：《煤炭学报》2017年11期

【摘要】：破断岩体裂隙的几何粗糙使得其中的流体流动行为呈现出显著的非线性。借助粗糙裂隙的平行板离散模型和COMSOL软件,分析了离散模型单元体内部的流体流速及压力分布规律,获得了岩体裂隙中非线性流动产生的物理机制;研究了裂隙几何特征对非线性流动的影响规律,提出岩体裂隙非线性流动的流量计算方法,并与数值模拟结果进行了对比。结果表明:隙宽突变处的附加压力降损耗是导致粗糙裂隙流体流动产生非线性的主因;裂隙壁面粗糙和雷诺数的耦合作用显著影响裂隙中流体的非线性流动行为,裂隙中隙宽明显收缩处是附加压力降损耗的主要位置;提出的粗糙裂隙非线性流动的流量计算方法显著提高了分析结果的准确度,显示出较好的实用性。
[Abstract]:Because of the geometric roughness of fractured rock mass, the fluid flow behavior is nonlinear. With the help of parallel plate discrete model of rough fracture and COMSOL software, the distribution of fluid velocity and pressure in the unit body of discrete model is analyzed, and the physical mechanism of nonlinear flow in rock mass fracture is obtained. The influence of fracture geometry on nonlinear flow is studied, and the flow calculation method for nonlinear flow of rock fracture is proposed, and the results are compared with the results of numerical simulation. The results show that the additional pressure drop loss at the abrupt change of gap width is the main cause of nonlinear fluid flow in rough fractures, and the coupling effect of roughness and Reynolds number on the surface of fracture wall has a significant effect on the nonlinear flow behavior of fluid in fractures. The main position of additional pressure drop loss is at the point where the gap width shrinks obviously, and the proposed flow calculation method for the nonlinear flow of rough fractures improves the accuracy of the analysis results and shows good practicability.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;四川大学;
【基金】：北京市自然科学基金资助项目(8164061) 国家自然科学基金资助项目(51578539) 国家重点研发计划资助项目(2016YFC0600704)
【分类号】：TD315

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