Measurement of groundwater dewatering in excavations in Tianjin

Based on the characteristics of engineering geology and hydrogeological characteristics in Tianjin, multiple excavation dewatering projects are monitored comprehensively in the entire process. Using different measurement methods, the pumping volume change relationships of excavation dewatering well and step-down well are studied through the sampling and comprehensive comparison. Combined with the existing engineering examples, the measurement methods and methods of precipitation water for different types of excavations are determined, and the empirical formula for calculating the precipitation water volume of excavations is obtained. At the same time, according to the monitoring data of water quantity in the process of pumping in different metering methods, the relationship between pumping water pumping and submersible pumping water pumping capacity and power consumption is summarized. According to the measured results of typical engineering and theoretical derivation, three methods for estimating groundwater pumping displacement in excavation engineering are proposed, namely well flowmeter method, volume calculation method and electricity estimation method.