岷江龙溪口航电枢纽工程船闸施工期监测

Construction period monitoring of ship lock of Longxikou Navigation-power Junction project in Minjiang River

船闸由上下引航道、上下闸首、闸室及输水系统等多部分组成。鉴于船闸结构组成及其运行过程中的受力情况较为复杂,船闸水工建筑物的施工安全与运行稳定显得尤为重要。通过对龙溪口船闸施工期监测数据的整理归纳,结合现场实际,采用定性常规分析和定量数值计算,分析各监测物理量的变化规律和发展趋势。结果表明:1)施工期间船闸基底渗透压力受围堰外江水、岸坡地下水及基坑内施工用水影响;2)船闸墙后回填土压力受填土深度及其内部含水量影响;3)混凝土内应力应变主要与温度控制有关。

The ship lock is composed of multiple parts,including upper and lower approach channels,upper and lower lock heads,lock chambers,and water conveyance systems.In view of the complexity of the structure composition of the ship lock and the stress situation during its operation,the construction safety and operational stability of hydraulic structures of the ship lock are important.This paper summarizes the monitoring data during the construction period of the Longxikou ship lock,combines it with the actual situation on site,and uses qualitative conventional analysis and quantitative numerical calculation to analyze the changes and development trends of various monitored physical quantities.The results show that:1)During the construction period,the seepage pressure of the ship lock base is affected by the river water outside the cofferdam,the groundwater on the bank slope,and the construction water in the foundation pit;2)the backfill pressure behind the ship lock wall is influenced by the depth of the fill and its internal moisture content;3)the internal stress and strain of concrete are mainly related to temperature control.