Research on Construction Technology of Deep Foundation Pit in High-rise Building
The safety and stability of foundation pit slope can be significantly improved by using soldier pile wall for foundation pit support.However,the influence law of excavation depth on surface settlement and pile displace-ment is not clear.Based on this,this paper uses Midas GTS software to establish a numerical calculation model to study the development and evolution law of foundation pit surface settlement and pile displacement under differ-ent excavation depths.The results show that the influence of foundation pit excavation on surface settlement can be divided into significant influence area,weak influence area and no influence area;with the increase of the distance from the edge of the foundation pit,the surface settlement increases first and then decreases,and the surface settle-ment is the largest in the range of 1 times the depth of the foundation pit from the edge of the foundation pit,so the surface settlement in the range of 1 times the depth of the foundation pit is mainly monitored during the construction of the foundation pit;in the range of anchorage section,the pile displacement does not change significantly with the increase of pile height and increases rapidly when the pile height exceeds the bottom of foundation pit,in the range of 1/3 from the pile top,the increasing trend of pile displace-ment with the increase of pile height slows down;with the increase of pile height,the pile displacement increases gradually,when the excavation depth is 5 m,15 m and 20 m respectively,the maximum pile displacement reaches 6.2 mm,14.8 mm and 17.8 mm respectively,which all meet the specification requirements.The research results can provide reference for the design and construction of soldier pile wall support structure.
deep foundation pitsoldier pile wall supportexcavation depthsurface settlementpile displacementMidas GTS software
NETL
NSTL
万方数据
