Study On Deformation Mechanism And Deformation Monitoring Of Fusen Building's Foundation

Foundation pit engineering is a system engineering of multi subject geotechnical and structural engineering,comprehensive,many influencing factors.In the excavation process,the original soil steady state will be broken down,there side vacant state,the stress redistribution,leading to soil instability phenomenon,caused by the engineering safety the problem.In order to guarantee the safety of construction,the need for supporting engineering,so the interaction between the soil after the excavation and supporting structure has become one of the most concerned problems in the design process.Shenzhen Fusen pit is located in Guangming New District Liuzhou large high-speed east China two.Site on the south side of the road from top to bottom strata can be divided into five layers,namely the artificial soil layer(Q4ml),lake sediments(Q4l),alluvium(Q3al+pl)and eluvium(Qel),the bedrock for the Sinian earthquake mixed rock(Z).Foundation pit with composite soil nailing wall design,respectively using slope and soil nailing with micro pile anchor,soil nailing anchor with micro pile and pile anchor supporting form.The field monitoring of the CPC set up 14 levels of observation points of vertical displacement,produce the foundation pit wall construction process monitoring in the horizontal,vertical displacement.And a set of 4water level observation,observation of foundation pit waterproof curtain leakage problem.The monitoring results obtained can be found in the central maximum displacement of foundation pit wall,the maximum horizontal displacement reaches25 mm,the maximum vertical displacement of 21 mm,proves that the foundation pit construction process SafetyIn this paper,through the numerical simulation of FLAC3 D software,establish the three-dimensional model of foundation pit support before and after fosson,stress and strain analysis of foundation pit excavation support.Before and after the comparison of maximum and minimum principal stress should be reduced greatly,the largest in support,and the minimum principal stress range to support pile in foundation pit bottom near the body.Near the slope position,the maximum and minimum principal stress are relatively large,there is a phenomenon of stress concentration,which caused the maximum excavation the horizontal displacement value in the bottom of the pit excavation soil horizontal displacement,the position of stress condition is complex.The lead position of supporting piles of foundation pit bottom large shear strain produced can be found,and the size of the pit has a certain influence on the maximum principal stress.The maximum horizontal displacement of foundation pit concentrated in the upper part and the direction toward the pit inside.For supporting the supporting structure of the support so heavy The biggest drop location in the foundation pit slope excavation edge,the overall distribution form similar to spoon shaped settlement of the wall after excavation,the maximum subsidence occurs in the pit slope distance from excavation edge position of 5.0~8.0m.The slope support has a mitigating effect on the excavation to a certain depth.There is a stress concentration in the foot of the pit,so that the horizontal displacement of the foot pit position is relatively large.After the excavation of the foundation pit to a certain extent,the excavation size of the foundation pit began to play an important role in the stress and strain of the foundation pit.In this paper,the relevant conclusions obtained by the finite difference method of FLAC3 D software can provide some reference for similar engineering design and construction...