高水头抽水蓄能电站高压岔管围岩非线性渗流分析及渗透稳定性研究  

Analysis of nonlinear seepage and study of permeability stability on surrounding rock of high-pressure manifold for high-head pumped storage hydropower station

作　　者：毕宏伟 胡少华[2] 乔彤[2] BI Hongwei;HU Shaohua;QIAO Tong(Bureau of Hydrology,Changjiang Water Resources Commission,Wuhan 430010,Hubei,China;School of Resource and Environment Engineering,Wuhan University of Technology,Wuhan 430072,Hubei,China)

机构地区：[1]长江水利委员会水文局,湖北武汉430010 [2]武汉理工大学资源与环境工程学院,湖北武汉430070

出　　处：《水利水电技术》2018年第6期171-178,共8页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金青年基金项目(51609184);长江科学院开放研究基金资助项目(CKWV2017511/KY)

摘　　要：针对抽水蓄能电站钢筋混凝土岔管承载的高内水压力导致围岩高渗压差、高水力梯度等问题,以高压岔管围岩渗流控制为目标,结合现场高压压水试验及其解析模型,定量分析高渗压下岔管围岩的渗流参数,基于单裂隙花岗岩非达西渗流室内试验成果,拟合Forchheimer非达西渗流方程影响因子与渗透率之间的指数型关系式。在此基础上,采用Forchheimer非达西渗流方程、Signorini型变分不等式和自适应罚函数相结合的方法,推导非达西渗流控制方程组及其有限元计算格式,并将其应用于阳江抽水蓄能电站高岔区围岩渗流规律研究。结果表明:高压岔管内水外渗导致防渗排水措施和导水断层附近区域产生了强烈的非达西渗流;采用非达西渗流理论计算的渗漏量明显小于达西渗流理论计算值,且差值伴随着流场非线性的增强而增大。研究成果对于高水头抽水蓄能电站岔管区防渗设计与控制具有参考价值。Aiming at the problems of high seepage pressure difference,high hydraulic gradient,etc. of the surrounding rock due to high internal water pressure borne by the reinforced concrete manifold of pumped storage hydropower station,the seepage parameters of the surrounding rock of the manifold under high seepage pressure are quantitatively analyzed in combination with the relevant in situ high water pressure test and its analytical model by taking the seepage control of the surrounding rock of high pressure manifold as the study objective,and then the exponential relation between the influence factor of Forchheimer＇s non-Darcy seepage equation and the seepage rate is fitted in accordance with the result of the relevant non-Darcy seepage indoor test on the granite with single fracture. On this basis,the non-Darcy seepage control equation set and its finite element calculation format are derived with the method of integrating Forchheimer＇s non-Darcy seepage equation,Signorini＇s variational inequality and the self-adaptive penalty function,and then applied to the study on the seepage law of the surrounding rock in the zone of the high pressure manifold for Yangjiang Pumped Storage Hydropower Station. The result shows that the seepage from the internal water in the high pressure manifold leads to that strong non-Darcy seepage occurs in the areas near the water diversion faults and the anti-seepagedrainage measures therein. The leakage calculated from the theory of non-Darcy seepage is obviously less than that calculated from the Darcy seepage theory,moreover,the difference value between them increases along with the increase of the nonlinearity of the seepage field. The study result has a referential significance for the design of the anti-seepage and seepage control of the zone of manifold for high-head pumped storage hydropower station.

关 键 词：抽水蓄能电站 高压渗透特性 高压压水试验 非达西流 渗流规律分析 岩体透水性能 水力劈裂 压力-流量关系曲线 

分 类 号：TU45[建筑科学—岩土工程]