Falling the ground water in deep foundation pit by well system in construction of hydraulic and coastat engineering structure

Abstract

The dewatering of foundation pit is influenced by the geological engineering condition of construction site, size of foundation pit, method of excavation, the influence to the adjacent works, therefore, the dewatering of foundation pit depends on work items as investigation, design and construction. Foundation dewatering by a system of surrounding wells is a popular and effective solution due to its high constructability and strong support of permeable theory. However, some cases have failed because of some objective causes. On the observation in the construction of Van Coc culvert in details from the begining, the author has used the Modflow software for the recalculation and obtained the results that in accordance with the actual state. Based on the mentioned case, the author has analyzed and shown considerations on the causes that happened during the investigation, design and construction for solving the failure in foundation pit that dewatered by pumping out from well systems.