Research On The Foundation Pit Construction Technology Of Changsha Metro Station In The Water-rich Sandy Cobble Strata Of Densely Built-up Areas

Relying on the National Key Basic Research and Development Program subject, precipitation, excavation and reinforcement of construction technology for excavation engineering in the densely built-up areas, were systematic analyzed by theoretical analysis, numerical calculation means. The main contents are as follows:(1)Huang Xing Square Station foundation pit dewatering characteristics was analyzed detailedly.Through field trials,the permeability coefficient of representative formation was determined. On this basis, the foundation pit dewatering methods was determined. Theoretical calculation was adopted to determine the the pit water inflow, review the drainage capacity of the single well. At last, number of precipitation pipe arranged was determined(2)The characteristics of the various excavation of the foundation soil was analyzed detailedly.Numerical calculation software was adopted to simulate the whole process of Huang Xing Square Station foundation soil excavation to conduct the feasibility.On this basis, Huang Xing Square Station pit detailed soil excavation scheme was determined.(3)On the basis of system analysis on the excavation engineering ground reinforcement technology, finite element analysis for judging the feasibility Huang Xing Square Station foundation reinforcement, the method suitable for the Huang Xing Square Station Foundation pit consolidated was proposed and discussed in detail.