Abstract

In soft soil ground,the soil will be disturbed during the excavation or construction of a foundation pit,resulting in large settlement on the surface of surrounding area.When the surface settlement exceeds a certain range of values,it will cause settlement and inclination of the surrounding building foundation.Material will even crack so that safety of the building cannot be guaranteed.In order to prevent adverse effects on adjacent buildings during the construction process,isolation piles are usually arranged between the protected buildings and the construction site to meet the protection requirements in the construction of a place closer to the building.As one of the main methods for stratum reinforcement during construction and reducing the disturbance of construction to the surrounding environment,the isolation pile has been widely used in case of foundation pit excavation,shield construction and surcharge construction projects.Research on isolation piles has been getting widespread attention around the world.

Most of the current researches focus on the effect and mechanism of the piles after the piles are construed completely,but this research concentrating on the surrounding soil disturbance during the construction of the pile is relatively few.During the construction of the pile,the surrounding soil or structure will be deformed resulting from construction disturbance or improper construction control.

Based on the Wanxiu Road Vehicle Base Station project near Hangzhou-Ningbo Passenger High-speed Railway Line,numerical models of single pile and row pile are established.Through the numerical simulation of Flac3D,analysis on the disturbance law of the surrounding piles caused by different single pile construction parameters and construction of row pile are conducted.Furthermore,appropriate construction control methods are suggested.

The main research contents and approaches are given below.