scholarly journals The influence of shallow buried double-line parallel rectangular pipe jacking construction on ground settlement deformation

2021 ◽  
Vol 60 (1) ◽  
pp. 1911-1916
Author(s):  
Shiju Ma ◽  
Mingyu Li ◽  
Junwei Jin ◽  
Kun Bai
Keyword(s):  
Ground Settlement ◽  
Double Line ◽  
Line Parallel ◽  
Pipe Jacking

Calculation Model for Ground Settlement Process of Xi’an Subway Tunnel Non-Synchronous Excavation with Double-Line

2011 ◽  
Vol 90-93 ◽  
pp. 2221-2225
Author(s):  
Fang Tao She ◽  
Sheng Jun Shao ◽  
Juan Fang ◽  
Yang Yang Jiao
Keyword(s):  
Control Function ◽  
Calculation Model ◽  
Ground Settlement ◽  
Subway Tunnel ◽  
Tunnel Excavation ◽  
Probability Curve ◽  
Double Line ◽  
Building Foundation ◽  
Current Calculation ◽  
Calculation Models

The current calculation models of ground settlement for tunnel excavation cannot reflect ground settlement of tunnel non-synchronous excavation with double-line. Based on the Peck ground settlement formula and Attewell ground settlement formula, displacement release of excavation place and tunnel non-synchronous excavation with double-line have researched. By means of finding a function to replace the accumulated probability curve, the new control function was beneficial to parameter introduced and improvement of the current ground settlement formula. By introducing the non-synchronous excavation distance and the displacement release coefficient of excavation place, A new calculation model for ground settlement process of tunnels non-synchronous excavation with double-line is proposed. The reliability and practical of the calculation models was verified. Research results were very important to analyze the ground settlement affecting the building foundation and pipe under ground.

scholarly journals Sensitivity analysis of ground settlement induced by pipe-jacking construction in soft soil stratum

2019 ◽  
Vol 136 ◽  
pp. 04028
Author(s):  
Xianmin Han ◽  
Wenjiang Li ◽  
Tao Chen ◽  
Wang Liu
Keyword(s):  
Elastic Modulus ◽  
Release Rate ◽  
Soft Soil ◽  
In Situ Stress ◽  
Surface Subsidence ◽  
Chamber Pressure ◽  
Ground Settlement ◽  
Stress Release ◽  
Pipe Jacking

Taking the ground settlement while pipe-jacking construction in soft soil as the engineering background, the effect of pipe jacking were studied by numerical simulation. It focused on the factors that mainly influenced surface settlement of ground including in-situ stress release rate (or ground loss ratio), chamber pressure, elastic modulus of soil, buried depth and diameter of pipe. That would provide theoretical basis for taking measures to reduce surface subsidence while jacking. The main conclusions were as follows: (1) The in-situ stress release rate and pipe diameter were proportional to the surface subsidence. (2) Chamber pressure, elastic modulus and buried depth were inverse proportional to the surface subsidence. (3) From the point of view of the influence on surface settlement, the sensitivity of pipe diameter and elastic modulus of soil was the greatest, followed by burial depth and chamber pressure, and the stress release rate was the smallest.

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

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Jun Tang ◽  
Shengcai Li ◽  
Yongfu Zhu
Keyword(s):  
Large Scale ◽  
Random Medium ◽  
Research Work ◽  
Ground Settlement ◽  
Stochastic Medium ◽  
Medium Theory ◽  
Measurement And Analysis ◽  
Prediction And Control ◽  
Pipe Jacking ◽  
And Control

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.

scholarly journals Analysis of Ground Settlement Caused by Double-line TBM Tunnelling under Existing Building

2021 ◽  
Author(s):  
Dongxue Hao ◽  
Renjun Zhu ◽  
Ke Wu ◽  
Rong Chen
Keyword(s):  
Numerical Model ◽  
Cross Section ◽  
Three Dimensional ◽  
Ground Settlement ◽  
Double Line ◽  
Existing Building ◽  
Ground Deformations ◽  
Geological Conditions ◽  
Line Construction ◽  
The Right

Abstract TBM tunnelling is less used in the subway construction in prosperous city due to the limitation of the engineering geological conditions. The studies on the influence of the TBM construction on the existing buildings are also limited. Therefore, based on the engineering case of tunnel crossing existing building in the section of Haiboqiao ~ Xiaocunzhuang station of Qingdao Metro Line 1, the numerical model that simulates the construction process of TBM tunnelling in slightly weathered granite layer is established by three-dimensional finite difference software FLAC3D to analyze the influence of TBM tunneling on ground settlement. The comparisons of ground deformations obtained from FLAC3D and field monitoring in different construction stages of double-line tunnel have been made firstly to validate the numerical model. Then the ground settlement characteristics, differential settlement and the stress distribution of the existing building and the stress of segment structure have been analyzed. Ground settlement groove along the transverse and vertical sections occurs near the building and tunnels, and the settlement becomes smaller with the farther distance from them. The settlement curve on the cross section changes dynamically and is approximately V-shaped, and its width is about 5 ~ 6 times diameter of the tunnel. For the same cross section, the range of the settlement groove after tunnelling right line increases obviously compared with that after tunnelling left line (construction first), the settlement values also increase, and the symmetrical axis of the settlement curve is shifted to the right. This paper can provide important practical reference for relative construction engineering.

scholarly journals Analysis on Surrounding Environment Influence Induced by Rectangular Pipe Jacking and the Control Scheme

2021 ◽  
Author(s):  
Fei Wang ◽  
Songxian Huang ◽  
Wen Chen
Keyword(s):  
Finite Element ◽  
Pile Foundation ◽  
Vertical Deformation ◽  
Ground Settlement ◽  
Site Monitoring ◽  
Element Simulation ◽  
Control Scheme ◽  
Pipe Jacking ◽  
Shallow Soils ◽  
Ground Heave

Based on rectangular pipe jacking project of the No.1 entrance of Qingshi Road station on Wuxi metro Line 4, to analysis how different treating methods work in the aspect of vertical deformation of the pile foundation around the pipe jacking tunnel and the ground settlement during pipe-jacking construction process, a 3-D finite element simulation model which simulate the process of rectangular pipe jacking crossing under viaduct is established. Some conclusions is drawn as follow: (1) the combination of isolation piles and shallow soils grouting reinforcements can constrain the vertical and horizontal deformation of the pile foundation and ground settlement caused by rectangular pipe jacking. (2) Both the maximum ground settlement and maximum ground heave can meet the requirement of special monitoring. (3) The result of the simulation is basically consistent with on-site monitoring data, which can prove the availability of the simulation and the treatment scheme.

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