Research on Construction Technology of Deep and Large Foundation Pit and Analytical Method of Settlement Prediction of Retaining Structure
This paper takes the research object of the Western Plaza of the Yancheng Railway Passenger Trans-port Hub,and conducts predictive research on the deformation trend of the base pit encirclement structure during the construction of the foundation pit.Firstly,according to the field monitoring data,the influence of zonal excava-tion technology on the stability of the foundation pit is studied.Secondly,based on the monitoring data of steel sheet pile supporting structure,the exponential smoothing method is introduced to predict the settlement deformation of steel sheet pile and establish the dynamic settlement prediction function.The results show that:with the increase of monitoring time,the total settlement of each measuring point on the north and south sides of the foundation pit in-creases rapidly and then tends to be stable.The deformation of the west side of the foundation pit is greater than that of the north and south slopes due to the influence of the main construction access roads and the migration of under-ground municipal pipelines.When the smoothing constant is 0.4,the prediction accuracy of the quadratic exponen-tial smoothing method is better than that of the first and third exponential smoothing methods,and with the increase of the smoothing constant,the fluctuation range of the third exponential smoothing value is much larger than that of the first and second exponential smoothing values.
foundation pitmonitoring timedisplacement velocitysedimentation velocityamount of deforma-tion
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万方数据
