Feasibility Analysis Of The Subway Station Topdown Construction At Harbin Electric Meter Factory

The development of underground space demands more strictly on deep foundation pit excavation technologies.Among various construction methods, topdown construction is used extensively because of its safety,practicality and economy.In the late 1980's,top down construction method was used successfully in Harbin underground street construction. Nowadays this construction method has been applied to highrise building and high level underground water construction. However,Harbin's topdown construction is mainly used in situations with good soil condition and deep underground water. According to the past local designs, the whole substructure in using stage was analysed in the light of underground structure design theory in force,in spite of taking mechanic characterics of divisional work structures into account, which is obviously not comprehensive and easy to lead to construction accident. It's very necessary to sum up topdown construction progresses in certain regions,and add them to topdown construction structure analysis theory.Most of the areas Harbin's first subway line will pass through own very good engineering geological conditions, such as silty clay which have little wet-subsidence and so on.Based on such kind of geology, study on the mechanic properties of this subway station which is going to be constructed with topdown construction method will be very theoritical and practical.The preliminary design of the first line of Harbin's subway station under XueFu street adopts RC retaining piles for slope retaming and plans to construct in usual order with top slab covered.This dissertation specially takes this part for example,compares topdown construction with this method using infinite numerical simulation on subway station structure,and makes a thorough investigation and study on subway station topdown construction feasibility:In the first place this dissertation studies the overall subway station topdown construction feasibility,then analyses all the loads of the whole topdown construction and the corresponding structure.By means of summing up the past subway station structure design...