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地下水封洞库通过水压将储存在洞室内的介质密封,涌水量的动态变化制约着洞库的密封性能。通过对岩体孔隙和裂隙双重介质的渗流特征分析,将渗流的非饱和流特性引入到涌水量的计算过程中。推导得到岩体双重介质土水特征曲线公式,并将其引入到有限元计算过程中。通过赋予材料非饱和特性属性,在有限元每个计算时间步中重新计算渗透系数,来实现地下水封洞库开挖时水位变化过程,建立了动态涌水量的计算方法。另外,通过工程实例对该计算方法进行验证、结果表明涌水量随时间呈递减变化,拟合得到了涌水量与时间的函数关系。该计算方法对地下工程中涌水量的研究具有较强的指导意义。
The groundwater seal cavern seals the medium stored in the cavern by hydraulic pressure, and the dynamic change of water gushing restricts the sealing performance of the cavern. By analyzing the seepage characteristics of the double media of pore and fracture in rock mass, the unsaturated flow characteristics of seepage flow are introduced into the calculation of water inflow. The formula of soil-water characteristic curve of double media of rock mass is derived and introduced into the finite element calculation process. By assigning the properties of unsaturated material properties, the permeability coefficient was recalculated in each calculation time step of finite element to realize the change of water level during the excavation of groundwater sealed caverns, and the calculation method of dynamic water inflow was established. In addition, this calculation method is validated through engineering examples. The results show that the inflow of water decreases with time, and the function of influent water as a function of time is fitted. The calculation method is of great guiding significance to the study of water inflow in underground engineering.