PROGNOZA ODDZIAŁYWAŃ ODWODNIENIA GŁĘBOKICH WYKOPÓW NA WARUNKI WODNE PROJEKTOWANEJ INWESTYCJI W REJONIE PELPLINA

Abstract

ANALYSIS OF DEEP EXCAVATION DEWATERING AND ITS IMPACT ON GROUNDWATER CONDITIONS OF PLANNED INVESTMENT IN THE AREA OF PELPLINAbstract. In the area of Tczew and Pelplin the construction of power plant is planed. Construction works would involve deep excavations for several building sites. This requires an identification of hydrogeological conditions with a volume of water inflow estimation. The field work showed the presence of various hydrogeological conditions which are a consequence of a complex geological structure. In order to identify hydrogeological conditions the execution of four pumping wells with observation wells and additional six piezometers was scheduled. During the work progress, it was found that the level of upper moraine aquifer is the only aquifer that is relevant to the planned investment. Therefore, one must plan to reduce the pressure below the bottom of the trench in order to prevent the penetration of fluid through the bottom of the trench. The data obtained from the research and pump tests were used for numerical simulation of groundwater flow under natural conditions and during dewatering of the various excavations. Modeling studies have shown that work associated with drainage trenches should not significantly affect the environment.