Study On Deformation Characteristics Of Deep Foundation Pit Supporting Structure In Thick Mucky Soil Layer

A case analysis of Wenzhou city,where has thick soft soil of coastal deposition,which is a typical bad soil,with high water content,high sensitivity,high compressibility and low shear strength.In this paper,based on the excavation of the foundation pit of the 1#block of Sanjiang Liti city,studied the technical problems of foundation excavation deformation and uncontrolled in thick mud strata.The mainly work:1.By analyzing the commonly used types of foundation pit support structure,the difficulty of excavation of deep foundation pit in soft soil layer and the deformation characteristics of deep foundation pit supporting structure,combined with the hydrogeological conditions of this care project.2.The deformation and stability of the supporting structure of the pit excavation are analyzed.Based on the foundation pit engineering,the earth excavation sequence,the internal force and deformation of the foundation,the overall stability anti-overturning stability and uplift calculation and anti-uplift.3.The results show that the deformation of the top of the pile can be divided into three main stages during the excavation process:the stage of slow displacement growth,the stage of rapid increase of displacement and the steady development stage.The excavation of the pit and the axial force of the anchor are gradually increasing.4.When the foundation pit is excavated,the axial force of the cable is stabilized,the supporting structure of the foundation pit is reasonable and the surrounding soil is no longer larger Displacement and support effect is better.Due to the influence of overturning and dynamic load,the maximum horizontal displacement of the deep soil in the location of the foundation pit exceeds the alarm value,but the overall support effect is ideal,which can ensure the safe excavation of the foundation pit.The effect of soil drainage and drainage is more obvious,which is beneficial to the excavation of soil.It can improve the strength of the soil in the passive area of the envelope and the stability of the deep foundation pit and control the deformation of the soil and the envelope of begging.