Analysis of Surveillance for Deep Foundation Pit of Subway Station

2012 ◽  
Vol 170-173 ◽  
pp. 1625-1628
Author(s):  
Bao Fu Duan ◽  
Lei Li
Keyword(s):  
Measured Data ◽  
Subway Station ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Retaining Structure ◽  
Design Scheme ◽  
Geological Conditions ◽  
Deformation Law

Deep foundation pit of subway station project are affected by the geological conditions with rich water and sand seriously. So the construction has a greater difficulty. We have to analyze the measured data and study on the deformation law of retaining structure and soil. That can be used as theoretical verification about the design scheme of retaining structure. The results show that this design scheme can be used as the support form in the similar geological conditions.

Mechanical Analysis of Enclosure Pile under Different Constraints

2011 ◽  
Vol 90-93 ◽  
pp. 485-489
Author(s):  
Li Guo ◽  
Peng Li He ◽  
Guang Jun Zhang
Keyword(s):  
Mechanical Analysis ◽  
Subway Station ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Retaining Structure ◽  
Cantilever Structure ◽  
Reinforcement Measures

The enclosure pile is extensively used as retaining structure in the foundation pit excavation. And it is always combined with other reinforcement measures. So it is unreasonable to a certain degree that the enclosure pile is analyzed as cantilever structure. Taken the deep foundation pit of a subway station in Hefei for instance, the effect of other reinforcement measures on restrained conditions of enclosure piles in the paper was taken into account. And the behavior of enclosure pile under various restrained conditions was analyzed. Based on that, some helpful suggestions for practical retaining structure of foundation pit were put forward.

Effect of Staged Excavation on Retaining Structure in Soft Soil Area

2012 ◽  
Vol 170-173 ◽  
pp. 633-636 ◽  
Author(s):  
Jie Liu ◽  
Xin Guang Xu
Keyword(s):  
Soft Soil ◽  
Horizontal Displacement ◽  
Structure Type ◽  
Operating Conditions ◽  
Deep Soil ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Retaining Structure ◽  
Geological Conditions

Based on a deep foundation pit in Tianjin, the authors introduced the retaining structure type, surrounding conditions, and the geological conditions of proposed field. According to the engineering characteristics, the excavation was divided into three typical operating conditions. Based on the monitoring of staged excavation of deep foundation pit, analysis on horizontal displacement, deep soil displacement, column settlement and bracing axial force was carried out. The general rules of the deformation and internal force of retaining structures induced by staged excavation were given, which will provide the references for similar engineering.

Numerical Analysis of the Deformation Law of Deep Foundation Pit of Subway Station by FLAC3D

2014 ◽  
Vol 915-916 ◽  
pp. 62-67
Author(s):  
Ya Long Liu
Keyword(s):  
Structural Type ◽  
Operating Conditions ◽  
Subway Station ◽  
Horizontal Deformation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Deformation Law ◽  
Bored Piles ◽  
Supporting Structures

Taking the deep foundation pit engineering of a Subway Station as background. The paper introduces the projects surroundings,geological and hydrological conditions of the proposed field and the retaining structural type. According to the engineering characteristics,the project was divided into four typical operating conditions,the deformation rules of deep foundation pit at subway station in tunneling are studied with the method of FLAC3D numerical simulation,the supporting structures choose by the bored piles and interior support. The analysis of the horizontal deformation of the retaining structures, the settlement law and the influence sphere of surrounding soil. The conclusion in this paper can provides reference for the reasonable design and safety construction of deep foundation pit.

Study on Measures to Retain the Deep Foundation Pit for Soil-Rock Composition with Weak Intercalated Layers

2013 ◽  
Vol 405-408 ◽  
pp. 373-377
Author(s):  
Jing Wang ◽  
Feng Ming Sun ◽  
Jin You Chen ◽  
Chang Jie Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Balance Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Rock Composition ◽  
Deep Foundation Pit ◽  
Retaining Structure ◽  
Geological Conditions ◽  
The Stability

Aiming at a deep foundation pit in soil-rock composition with weak intercalated layers, in this paper, using the limit-balance method and finite element method to analyze the stability and deformation. The safety factor of foundation pit under the absence of retaining is much less than 1 through the limit-balance method, but through some retaining measures can guarantee its safety. According to the excavation of the foundation pit in special geological conditions, it takes pile-anchor retaining structure in upper and soil nailing in the lower part. Using the finite element to carry out dynamic simulation for the whole project, the results show that: this form of retaining can be very good to ensure the excavation of the foundation pit in the geological conditions, and it may be helpful for similar projects

Design Scheme and Construction Technology of Combined Support for a Deep Foundation Pit Excavation

2013 ◽  
Vol 353-356 ◽  
pp. 819-822 ◽  
Author(s):  
Mai Wu ◽  
Xin Zhao ◽  
Kai Liu ◽  
Chun Lei Wang ◽  
Hui Xuan Geng
Keyword(s):  
Horizontal Displacement ◽  
Construction Technology ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Design Scheme ◽  
Geological Conditions ◽  
Design Requirements ◽  
Construction Organization ◽  
Support Engineering

A deep foundation pit project in Changsha City covers an area of about 63000m2, the largest excavation depth of the pit is 16.2 m, so it belongs to the deep and large foundation supporting engineering. By comprehensive analysis of the proposed construction site environment conditions and engineering geological conditions the different combined supporting schemes are adopted in different domains separately. In this paper the design schemes of the combined supporting technology are introduced. The problems encountered in the excavation construction process and the corresponding measures being taken are analyzed in detail. The results show that the design scheme is reasonable. Both horizontal displacement and settlement can meet specification and design requirements. At the same time the reasonable construction organization makes the support engineering be finished within the scheduled term, which saves the precious time for the following construction procedure. Furthermore it provides guidance for similar projects.

scholarly journals Optimization Analysis of Deformation of Underlying Tunnel in Dewatering and Excavation of Phreatic Aquifer

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Jing Wang ◽  
Pengcheng Wang ◽  
Wenda Wang ◽  
Shouqiang Zhou ◽  
Xiang Fang
Keyword(s):  
Lateral Displacement ◽  
Beam Theory ◽  
Layer By Layer ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Maximum Displacement ◽  
Deep Foundation Pit ◽  
Maximum Deformation ◽  
Phreatic Aquifer ◽  
Deformation Law

This paper theoretically analyzed the deformation law of the underlying tunnel caused by dewatering and excavation of deep foundation pit in the phreatic aquifer area, which is based on the Mindlin solution and the double-sided elastic foundation beam theory, and used the finite difference method and the fluid-solid coupling principle to conduct three-dimensional numerical simulation of dewatering and excavation of deep foundation pit with fluid-solid coupling by using FLAC3D5.00. This research shows that the layered and segmented excavation method from the middle to the end by dewatering the skip layer has a better effect on optimizing the deformation of the underlying tunnel through the simulation of three excavation methods and two dewatering schemes crossing each other, which is about 2.5% less than the layer-by-layer dewatering scheme. In addition, the deformation law of the simulated value is the same as the theoretical value, and the simulated value is slightly larger than the theoretical value. Underlying tunnel only just exists vertical deformation at the direct center of the foundation pit, and the maximum deformation is about 3.054 mm under the dewatering well of the jumping layer and W3. With the dewatering of jumping layer and the third excavation mode (W3), underlying tunnel only just exists lateral displacement at the position where is the retaining structure, and the maximum displacement is 1.606 mm.

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