A Case Study - Dewatering in Reactor Building CHNA Substation

Abstract

Construction of buildings, powerhouses, dams, Bridges, and many other structures requires excavation below the water table into water-bearing soils. Such excavations require lowering the water table below the slopes and bottom of the excavation to prevent ravelling or sloughing of the slope and to ensure dry, firm working conditions for construction operations. Dewatering is a critical process in the construction industry to remove excess water from the soil or excavation site. There are several techniques for dewatering, including wellpoints, deep wells, sumps, and open pumping. Wellpoints are commonly used in shallow excavations and involve drilling small-diameter wells and installing wellpoint filters. Deep wells are used in deeper excavations and involve drilling large-diameter wells to reach the water table. Sumps involve excavating a pit at the lowest point of the site and pumping water out. Open pumping is used when there is a large amount of water to remove and involves pumping it to a discharge point. The selection of the dewatering technique depends on several factors, such as the depth of the excavation, soil type, and the amount of water to be removed. Proper dewatering is crucial for maintaining the stability and safety of the construction site