Study On Deformation Characteristics And Stratum Displacement Of Asymmetric Deep Foundation Pit

The foundation pit of No.4 working well of Xiamen No.2 West Passage is adjacent to Xinghu Road and there is overload on the east side of the foundation pit.The load outside the pit is asymmetrically distributed,and the envelope structure is also asymmetrically designed.At present,there are few studies on the deformation of such asymmetric deep foundation pits and the displacement of the outer stratum in Xiamen area.Therefore,it is of great practical significance to carry out research on the deformation characteristics and stratum displacement of the foundation pit of 4#working well.Provide similar references for engineering design and construction.In this paper,the engineering characteristics analysis,field measurement and numerical simulation are used to systematically study the deformation characteristics of asymmetrical deep foundation pit and the influence of formation displacement.The main research results are as follows:(1)Finding the relevant literatures on the study of the deformation of the foundation pit and the displacement of the stratum,and presenting their own views on the deformation of the asymmetric foundation pit,and summarizing the difficulties and key points encountered in the engineering practice..(2)According to the construction conditions on site,the monitoring plan suitable for implementation is formulated.The section data of each monitoring project is analyzed by partial items.The horizontal displacement of the pile top of the asymmetric foundation pit and the inclination law of the pile body are summarized and summarized.Overall deformation law and mechanism.(3)The finite element model is established based on the actual working conditions to simulate the influence of the horizontal and vertical displacement of the asymmetric deep foundation pit retaining structure and the displacement of the soil outside the pit,and the calculation results and the measured data are analyzed.In contrast,the rationality of the model and the accuracy of the measured results are verified,and the overall deformation mode of the asymmetric deep foundation pitretaining structure and the deformation mode of the soil outside the typical section pit are obtained.(4)Through the influence factor analysis,the mechanism of the horizontal displacement deformation mode of the deep piles in the direction of the foundation pit parallel to the foundation pit is further revealed,and the influence of other related influencing factors on the deformation of the retaining structure and the soil outside the pit.(5)By summarizing the calculation results of the full-text measured data and numerical model comparison,the deformation modes of the asymmetric foundation pits in Xiamen and the mechanism behind the different deformation modes are obtained,which provides a successful case analysis for the following related projects.