Design and modelling for groundwater engineering and control
Design and modelling for groundwater engineering and control
Groundwater engineering and control is regularly used to lower the water table and pore pressure beneath and surrounding deep excavations for the construction of shafts, tunnels and other deep structures. The construction methodology will greatly influence the type of groundwater control system most appropriate. There is a different groundwater control system required for an open-cut excavation, than that required for an impermeable steel sheet pile, secant or diaphragm wall. Similarly, the type of groundwater control system designed can greatly influence the type of construction required. A professionally designed dewatering system can result in a substantial reduction in cost and carbon emitted. If mathematical modelling is used during the design, the groundwater control system can be optimised. This paper presents recommended stages in the design, modelling and construction of a groundwater control dewatering system. Examples are presented of efficient design and modelling for both abstraction and recharge systems. Presented is a case study where a groundwater control system was designed to lower the water table below a deep detention shaft, an open-face pipe jack operation, and a smaller reception shaft in a mature garden. Modelling resulted in the final design only requiring boreholes around the deep shaft, eliminating unnecessary construction of boreholes and pipework around other structures.
Stephen D. Thomas; George R. French; J. Watson; B. Casal
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
D - Current and new construction methods
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