System Stability of Bored Piles with Steel Supports for Deep Foundation Pits in Sandy Pebble Stratum

2020 ◽  
Vol 14 ◽  
Author(s):  
Xuansheng Cheng ◽  
Junliang Hong ◽  
Qingchun Xia ◽  
Haibo Liu ◽  
Fei Gao ◽  
...  
Keyword(s):  
Stability Analysis ◽  
System Stability ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Analysis Theory ◽  
Overall Stability ◽  
Overturning Stability ◽  
Bored Piles ◽  
The Stability

Background: At present, there is few researches on the stability of the supporting structure of bored piles with steel supports for deep foundation pits, and it is even less common to use this support method for deep foundation pits in sandy pebble stratum. This paper studied the stability of the deep foundation pit support of the Southwest Jiaotong University Station in Chengdu, China, using the stability analysis theory of bored piles with steel supports for deep foundation pits Objective: The study aims to show the stability of steel supports for deep foundation pits Methods: The overall stability, anti-overturning stability and uplift stability of the foundation pit are important components of the stability analysis of bored piles with steel supports for deep foundation pits. Aiming at the designed method and parameters of the bored piles with steel support for the deep foundation pit, an in-depth theoretical analysis and calculation of the overall stability, anti-overturning stability and uplift stability of the deep foundation pit is conducted respectively Results: The results show that the stability of the deep foundation pit using bored piles with steel support meets the requirements, meaning the design of this support form is safe and reasonable, thus ensuring the smooth progress of the project. Conclusion: The stability analysis of deep foundation pits in sandy pebble stratum provides ideas for the optimization of deep foundation pits and a reference for the stability analysis of deep foundation pits in sandy pebble stratum and other types of stratum.

Research of Controlling for Pile-Anchor Joint Supporting Structure on Deformation of Deep Foundation Pits

2011 ◽  
Vol 261-263 ◽  
pp. 1809-1813
Author(s):  
Jin Biao Chen ◽  
Qiang Hu ◽  
Yuan Wu Zhou
Keyword(s):  
Soil Properties ◽  
Deformation Mechanism ◽  
Geotechnical Engineering ◽  
Reliability Theory ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Foundation Deformation ◽  
The Stability

The excavation of deep foundation pit is very complex in the field of geotechnical engineering, how to control the deformation of deep foundation pit and protect the environment is of great significance. This paper analyzed the deformation mechanism of pile-anchor joint supporting structure in detail, established a model for deformation controlling based on the reliability theory, and then analyzed the sensitivities of prestressed, pile stiffness, spacing and soil properties to foundation deformation. Combined with an engineering example, this paper verifies the stability and effectiveness of the model for deformation controlling. This study will provide some reference to similar projects.

Monitoring and Analysis on the Supporting Structure for Deep Foundation Pit

2014 ◽  
Vol 580-583 ◽  
pp. 787-790
Author(s):  
Hai Xia Sun ◽  
Ke Zhang ◽  
Si Li Chen
Keyword(s):  
In Situ Monitoring ◽  
Monitoring Data ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Metro Station ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Deformation Features ◽  
The Stability

This article mainly expounds the importance of in-situ monitoring on the construction process of deep foundation pit. Taking the deep foundation pit of some Shenyang metro station for example, the deformation features of the supporting structure and the internal and external of foundation pit is analyzed, according to the monitoring data of the fender pile displacement during the excavation of deep foundation pit. The conclusion is obtained that the timely and accurate in-situ monitoring information is necessary to guaranteeing construction safety. We should pay more attention to the excavation speed and exert the interior support timely during the excavation of foundation pit to avoid large deformation and danger. The analytical results of monitoring data shows that the whole stage of foundation pit excavation is stable and the fender pile with internal supports can guarantee the stability of foundation pit.

Application of Anchoring Concrete Filling Piles in Deep Foundation Pit Engineering at Zhengzhou North Freight Marshalling Station

2013 ◽  
Vol 438-439 ◽  
pp. 1423-1426
Author(s):  
Xin Zhong Zhang ◽  
Yong Jun Cheng ◽  
Ke Dong Tang
Keyword(s):  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Railway Line ◽  
Anchor Cable ◽  
The North ◽  
Bored Piles ◽  
Marshalling Station ◽  
Concrete Filling ◽  
Construction Practice

This paper introduces the "Levels of anchor cable +Bored piles +Net shotcrete combined support plans application in deep foundation pit engineering at Zhengzhou north freight marshalling station. Construction practice and monitoring data show that the engineering supporting design and construction have got an ideal effect, to ensure the safety of the north Ring Bridge and the railway line. It has a certain guiding significance to similar municipal engineering.

Stability on Supporting Structure of Deep Foundation Pit with Infiltration

2012 ◽  
Vol 170-173 ◽  
pp. 223-226 ◽  
Author(s):  
Xue Song Gao ◽  
Jian Jun Dong ◽  
Xu Zhao ◽  
Peng Yang Yin ◽  
Shao Hua Lv
Keyword(s):  
Bending Moment ◽  
Rainfall Infiltration ◽  
Deep Excavation ◽  
Initial State ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Building Foundation ◽  
Internal Forces ◽  
The Stability

The FLAC3D was used to the fluid-solid coupling numerical simulation of considering the initial state of unsaturated to soil for the deep foundation pit engineering under different rainfall infiltration conditions. By comparing the bending moment, the shearing stress and internal forces of support under the infiltration conditions between non-rainfall and rainfall, the paper focus on the stability of deep foundation pit. Research on the stability of deep excavation under rainfall conditions was a useful attempt. From the detail study of the stability of a foundation pit of Qinhuangdao under rainfall infiltration conditions, the paper have drawn some useful conclusion on the design of building foundation pit, which can be the basis of excavation design and construction under rainfall conditions.

A Method of Calculation on the Deformation of Column Piles in Deep Foundation Pit

2013 ◽  
Vol 291-294 ◽  
pp. 1131-1134
Author(s):  
Lin Na Sun ◽  
Yan Liu ◽  
Li Ming Zhang
Keyword(s):  
Calculation Method ◽  
Bending Moment ◽  
Practical Case ◽  
Vertical Deformation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Method Of Calculation ◽  
Overall Stability

During excavation of deep foundation pits, the effects of vertical deformation on column piles are often neglected while those uplifts may lead to destruction of internal supports. The factors leading to the column piles' vertical deformation mainly include basal uplift and vertical loads. In this paper, the causation and mechanism of the column piles' uplift are discussed. The influence of the additional bending moment due to the column piles' vertical deformation on the overall stability of the founda-tion pit is analyzed. A calculation method of the permissible value of vertical deformation is present¬ed. The method is verified by a practical case to be feasible.

The Stability Analysis of Deep Foundation Pit Engineering Support and Field Testing Research

2011 ◽  
Vol 105-107 ◽  
pp. 1456-1459
Author(s):  
Xiang Dong Zhang ◽  
Zhi Liu ◽  
Xi Jun Liu
Keyword(s):  
Field Testing ◽  
Element Model ◽  
Transverse Displacement ◽  
Simulation Design ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Displacement Effect ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
The Stability

In order to study the foundation pit supporting structure displacement of the change rule and different parameters on the transverse displacement effect of pile. My research based on supporting structure engineering of Shenyang Washington. We use the software ADINA as a research tools to establish a finite element model. We simulated and analyzed the displacement with and without anchor. Results show that adding anchor supporting played a very good supporting effect, and the simulation results and actual test results compared and analyzed proved reasonable and simulation design scheme was feasible, this excavation has some guidance for the engineering and a certain reference for similar deep foundation pit bracing. [1]

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

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