Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Jun Tang,Yongfu Zhu,Shengcai Li,Yunzhong Jia

doi:10.1155/2021/8347227

Abstract

The large-scale rectangular pipe jacking technology has attracted more and more attention in the construction of urban underground pipe galleries, especially the problem of prediction and control of the surface settlement. Taking the pipe gallery project of Chengbei Road in Suzhou as an example, the settlement values of three groups of monitoring sections under the conditions of natural settlement and synchronous grouting are monitored, and the measured settlement values are compared with Peck formula and random medium theory. The results show that the Peck formula is more accurate in predicting the natural settlement within 1.5 times the pipe jacking width, while the stochastic medium theory is more accurate in predicting the settlement beyond the width. By comparing the field test and theory, the suggestions on the prediction of ground settlement of rectangular pipe jacking of large scale are put forward. The results of this study provide a basis for subsequent related research work and engineering applications.

Highlights

With the acceleration of urbanization, the expansion of underground space has gradually become a hot issue in the comprehensive utilization of urban space
E research methods of surface deformation caused by pipe jacking mainly include experience method, theoretical analysis, numerical simulation, and actual field measurement analysis
Peck [10] obtained the conclusion that the land subsidence trough is typically distributed based on the analysis of the number of engineering measured data. e Peck formula for estimating the lateral ground settlement trough is proposed under the assumption that the soil is incompressible

Summary

Introduction

With the acceleration of urbanization, the expansion of underground space has gradually become a hot issue in the comprehensive utilization of urban space. Ere are two common theoretical analysis methods for the calculation of soil stress and displacement caused by underground engineering construction such as pipe jacking and tunnel construction: the classical theoretical analysis and the random theory analysis. Based on the comparison between simulation results and field measurement, Zhang et al proposed the technological methods to reduce the uplift and ground settlement of the tunnel. Zhang et al [31] summarized four calculation methods of jacking force in the process of pipe jacking construction of Gongbei tunnel and compared with a field test. Based on the theoretical analysis of Peck and random medium, the settlement law caused by rectangular pipe jacking in the large fault flour sand formation will be analyzed based on the field data

Project Background and Monitoring Methods

Monitoring Results

Theoretical Analysis of Ground Settlement