基于改进节点虚流量法的渠道工程施工期渗流场分析

利用求解有自由面渗流的改进节点虚流量法，对大型渠道工程施工期渗流场进行三维有限元模拟，得到不同条件下渠道渗流场的水头分布、浸润线、抽水量以及水力坡降。对施工期不同的降排水方案进行分析和评价，并在控制降水井水位的情况下对各方案进行分析，给出各方案下降水井抽水水位与渠底地下水位和单井抽水量的关系。结果表明，改进节点虚流量法能较好地模拟渠道渗流，可较为准确地判定方案是否满足工程实际要求，为实际工程提供理论和技术支撑。

Analysis of seepage field based on improved node virtual flow method in a large-scale canal project during construction period

The finite element analysis of 3D simulation for the large-scale canal project during construction period is performed based on the improved node virtual flow method to solve seepage with free surface, and the water head distribution, saturation line, leakage with hydraulic slope are obtained. The emphasis is placed on the study of different precipitation schemes during construction period and the relationship between the quantity of the dewatering well, the underground water level of the canal and the seepage discharge controlling the water level of the dewatering well. The study indicates that the method can simulate the seepage field of canal project well and accurately determine whether the program meets the requirements of the project, and it can give a theoretical and technological support for similar practical engineering.