Stratum Deformation Control Measures Of Super Excavation Of Deep Foundation And Engineering Practice

With the development of society, people pay more and more attention on traffic proble ms, the metro can well ease a city’s traffic pressure. But with the construction of the metro, t he first problem is the excavation of deep foundation. The metro go through the downtown a rea and the depth of foundation is deeper far than the ordinary deep foundation, so we called that super deep foundation. The research on excavation of super deep foundation in the geolo gical conditions of Chengdu region is rare, because the Chengdu Metro is built these years, which is developing lower than eastern coastal city. Various aspects of the specification and the research results are lacking, so the study of Chengdu area of super deep foundation pit ex cavation deformation is very necessary.This paper reviews the development of deep foundation pit related technology, summari zes the existing deep foundation design calculation method and construction method; introdu ced the research on the practical engineering-Chengdu Metro Line4excavation project and super deep foundation pit engineering; starting from the specificity geological conditions of the Chengdu (two kind of structures) and through the comparison of the successful case of area deep foundation pit supporting project, we come up with the stratum deformation contro1measures of excavation of super deep foundation; this measure is also be tested correctly by the software BejingLizheng. This thesis is also use the software FLAC3D to simulate the ex cavation process, analysising the deformation of the super deep foundation pit; looking for c onstruction process control point, using parametric modeling thought, by changing the param eter value calculation method to find out the influence of super deep foundation pit of stratu m deformation factors and corresponding control measures and construction points.The conclusions of this paper are:row of pile and inside support method can effectively control the Chengdu area excavation of super deep foundation pit deformation effect of strat um; stratum deformation are affected by the following factors:reasonable choice of supporti ng, the ground overload, excavation, precipitation, and puts forward some control measures.