APPLICATION OF INTEGRATED PUMPING AND SEEPING METHOD IN DEWATERING OF FOUNDATION EXCAVATION IN BEIJING

:Pumping tubular well commonly used in dewatering of deep excavations in Beijing often leads to unequal settlement of surrounding buildings, roads and underground pipelines because the fine granule of soil is taken out when pumping, which leads to waste of the groundwater resource in Beijing.By use of hydraulic gradient principle, integrated pumping and seeping method is to make upper sluggish water and underground water get to sand cobble layer whose permeability coefficient is bigger to avoid the come out of fine granule of soil during pumping and the waste of groundwater resource.