On Atypical Affection on Environment due to Dewatering of Foundation Pit in Developed River System Area

With the environment problems more and more emerged the matters caused by dewatering are set out to be probed and the rule that the ground settlement around a dewatering well presents a funnel shape , is acquainted usually. But in the case of special geology and hydrology due to this paper a new ground settlement pattern presents according to the buildings failure status and the subsequently monitoring results analysis. Namely the ground settlement along the transverse direction to the underground runoff presents V-shape flute profile in the area around the predominant underground runoff. The results also demonstrate that: 1 The foundation type in main building is as same as in the podium building .The main building kept stable while the podium building presented large settlement and inclination and went to failure in final during the construction of the pit. 2 The difference of affecting degree due to dewatering in the environment around the pit is variable and the main affecting zone appears locality and directivity. According to the investigation the most possible main resource of dewatering originates from the river system around to the pit pass by the podium building. 3 Combining the construction process of the pit and the time points of deformation in the building , associability is confirmed between buildings deformation and dewatering on the pit on the ground of excluding the other artificial factors around the building.