scholarly journals Force Chain Effect of Deep Foundation Pit Supported by Soldier Piles in the Sand-Gravel Layer

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Jiang Xie ◽  
Xiaojia Lu ◽  
Jinan Wang ◽  
Liu Yang ◽  
Xiangang Han
Keyword(s):  
Hard Rock ◽  
Chain Structure ◽  
Force Chain ◽  
Rock Layer ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Gravel Layer ◽  
Excavation Process ◽  
Surrounding Soil

Soldier pile support is an important tool for supporting deep foundation pits in the sand-gravel layer. However, since the sand-gravel layer itself is an aggregate of particles, its noncontinuity will cause extremely complex changes in the properties of the surrounding soils during pile supporting, and the changes in the mechanical properties of the soil behind the piles can also affect the safety and stability of the pit. To study the changing pattern of the surrounding soil in the course of pile supporting, we used the numerical method to simulate an excavation in the sand-gravel layer, followed by an analysis of the movement and stress distribution of the surrounding rocks. A photoelastic experiment was carried out to simulate the excavation process and study the force chain network of the surrounding soil as well as its changing characteristics. As shown by the results, (1) during the excavation of a deep foundation pit supported by soldier piles, on the same horizontal plane, the force chain changed most dramatically at the position that was 13.8 m (depth of the foundation pit) away from the edge of the foundation pit; (2) during the excavation, the force chain structure of the surrounding soil changed from vertical development to both vertical and horizontal developments; when there was a hard rock layer at the bottom of the soldier piles, the supporting effect of the piles was mainly provided by the hard rock layer; (3) the free face should be reinforced, and the excavation face should be adjusted based on the underground conditions of surrounding buildings (structures).

Simulation of Excavation Process for Deep Foundation Pit Base on Nonlinear Finite Element Theory

2015 ◽  
Vol 744-746 ◽  
pp. 579-583
Author(s):  
Hui Min Wang ◽  
Zhen Jian Ji ◽  
Liang Cao ◽  
Ji Yao ◽  
Shan Guang Qian
Keyword(s):  
Finite Element ◽  
Safety Evaluation ◽  
Nonlinear Finite Element ◽  
Distribution Law ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Simulation Research ◽  
Deep Foundation Pit ◽  
Excavation Process ◽  
Element Theory

Deep Pit is the main content of modern urban geotechnical engineering. In this paper, based on a deep foundation pit engineering as an example, based on the nonlinear finite element theory, conduct a numerical simulation research for foundation pit excavation process. Obtained the distribution law of pit deformation, stress distribution and the supporting structure of the internal forces, under the various processes. These provide a theoretical basis for safety evaluation of foundation pit engineering.

Research on the Influence of Deep Foundation Pit Excavation on Neighboring Buildings

2014 ◽  
Vol 1055 ◽  
pp. 131-134
Author(s):  
Wen Jing Chai
Keyword(s):  
Construction Projects ◽  
Deep Excavation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Excavation Process ◽  
Technological Level ◽  
Deep Foundation Excavation ◽  
Management Staff ◽  
The Impact

With the development of society and economy, China's investment in construction projects is increasing, which requires the construction and management staff to improve their professional level, to develop a more scientific construction plan to ensure construction quality, and ultimately to the construction goal. Especially in deep foundation excavation process, it not only needs to upgrade the technological level of the excavation, but also needs to enhance the impact of researches on the approaching buildings to make the appropriate preparations to reduce adverse effects on the surrounding buildings, which meets the actual needs of construction, to ensure building construction safety. By exploring the impact of deep excavation on adjacent buildings, the paper makes the construction workers deeply understand the importance of deep foundation construction work.

The Numerical Simulation and Deformation Analysis to the Deep Foundation Pit of Diaphragm Wall Based on Midas/GTS

2015 ◽  
Vol 733 ◽  
pp. 456-459
Author(s):  
Jin Jun Liang ◽  
Fei Wang ◽  
Ya Wen Liu ◽  
Xing Yuan Sun
Keyword(s):  
Deformation Analysis ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Traffic System ◽  
Finite Element Software ◽  
Excavation Process ◽  
Connection Line ◽  
Calculation Results ◽  
Adjacent Soil

Taking the J2 area YK10+615~YK10+650 miles section related to the connection line of River-crossing tunnel to Nanjing plum delta--the youth Olympic axis underground traffic system engineering as the background, the 3d model is established by using finite element software MIDAS/GTS, the mileage period of excavation process is simulated, discuss the influence of excavation on adjacent soils. Calculation results show that the excavation will inevitably cause deformation of adjacent soil, and comparing the results of calculate and the actual monitoring data show that the method has certain guiding significance to actual engineering.

Study Influence of Groundwater Seepage on the Deep Foundation Pit

2010 ◽  
Vol 168-170 ◽  
pp. 2477-2480
Author(s):  
Hong Mei Gao ◽  
Yan Lin Zhao ◽  
Ji Tao Zhao
Keyword(s):  
Permeability Coefficient ◽  
The Other ◽  
Deformation Characteristics ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Groundwater Seepage ◽  
Surrounding Soil

Consideration of influence of the groundwater seepage and supporting measures to deep-foundation pit,the deformation characteristics of surrounding soil of the foundation pit are given. Seepage and deformation characteristics of surrounding soil are simulated to predict deformation of the deep foundation in ha er bing and stability of deep-foundation pit is analyzed base on the influence of the seepage. The analysis results are compared with observed data and it is showed that the calculated results with the model considering coupling response of permeability coefficient are closer to observed value than those results with the other model. So, the model considering fully coupling response of permeability coefficient is reliable and applicable.

Application of Oppression Construction Method in Soft Soil of Deep Foundation Pit Engineering Management

2012 ◽  
Vol 594-597 ◽  
pp. 3019-3023
Author(s):  
Ying Chun Zhuang ◽  
Jie Chao Shen ◽  
Xiao Dong Pan ◽  
Jian Bo Tong
Keyword(s):  
Construction Management ◽  
Soft Soil ◽  
Engineering Management ◽  
Construction Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Engineering Construction ◽  
Deep Foundation Pit ◽  
Excavation Process ◽  
Management Method

Taking a project of Hangzhou as the example, a new management method named oppression construction method was proposed in soft soil of deep foundation pit engineering management. This method was based on the foundation pit excavation by layer and section. Through timely supporting of foundation pit and construction information management, the foundation pit supporting exposure time and exposed to the breadth and height was decreased. Thus the excavation process to the periphery environment influence was effectively reduced. It provided beneficial reference for the future of deep foundation pit engineering construction management.

scholarly journals Numerical Analysis of Deep Foundation Pit Excavation Process

2021 ◽  
Vol 719 (3) ◽  
pp. 032051
Author(s):  
Xiaoyi Jiang ◽  
Qingrui Lu ◽  
Xiaopeng Chen ◽  
Jinling Liu ◽  
Ping Li
Keyword(s):  
Numerical Analysis ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Excavation Process

scholarly journals Environmental Impact Assessment of Deep Pit Project in floodplain near Yangtze

2019 ◽  
Vol 136 ◽  
pp. 04083
Author(s):  
Li Anyun ◽  
Li Yan ◽  
Gao Shiyu ◽  
Zhao Xiaopeng ◽  
Wang Jian ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Impact Assessment ◽  
Environmental Impact Assessment ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Deep Pit ◽  
Wide Range ◽  
Floodplain Area ◽  
Surrounding Soil

The construction of deep pit has a great impact on the surrounding environment, which is mainly reflected in the subsidence of surrounding soil. Because of the particularity in geological and hydrogeological conditions of riverside floodplain area, environmental impact assessment is needed. According to the monitoring data of practical engineering, the deep pit in the floodplain area near Yangtze River may cause a large subsidence of the surrounding soil with a rapid subsidence rate and a wide range of subsidence effects. The subsidence of the surrounding soil increases with the depth and time of excavation, and the post-construction subsidence effect is not obvious. The environmental effects of the deep foundation pit project in this project have provided valuable experience for guiding the implementation of the deep foundation pit near the floodplain in the future.

Coupling Numerical Analysis for Excavation of Deep Foundation

2011 ◽  
Vol 90-93 ◽  
pp. 666-669
Author(s):  
Li Hui Cao ◽  
Fu Guang Zhang ◽  
Huai Ping Feng
Keyword(s):  
Coupling Effect ◽  
Horizontal Displacement ◽  
Coupling Model ◽  
Time Effect ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
The Road ◽  
Deep Pit ◽  
Surrounding Soil

Using coupling model, the time-effect behavior for deep pit during excavating and dewatering is studied. The distribution of the seepage field, the horizontal displacement of wall, the settlement of surrounding soil and the settlement of the road are all obtained from the coupling analysis. Taking the deep foundation pit engineering of one station as engineering background, the coupling of seepage and consolidation is simulated in the process of excavating. According to the comparative analysis between the simulation value and the measured results, it can be known that the calculation value considering the coupling of seepage and consolidation is well in accordance with the measured value. The analysis shows that the provide method can be used to simulate the deep foundation under the coupling effect and it is reasonable, feasible, and can provide some kind of references to design and construction.

Analysis of Deep Foundation Pit of Subway Station

2014 ◽  
Vol 1004-1005 ◽  
pp. 1570-1574
Author(s):  
Yu Long Cheng
Keyword(s):  
Operating Conditions ◽  
Subway Station ◽  
Horizontal Deformation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Site Specific ◽  
Deep Foundation Pit ◽  
Bored Piles ◽  
Supporting Structures ◽  
Surrounding Soil

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 axial force changes of steel support,the settlement law and the influence sphere of surrounding soil. For installation of prop structures on the performance of deep excavations is investigated through numerical analysis with site specific subsurface conditions,The conclusion in this paper can provides reference for the reasonable design and safety construction of deep foundation pit.

The Analysis on Monitoring Data and Finite Element Simulation of the Deep Foundation Pit in Tianjin

2011 ◽  
Vol 243-249 ◽  
pp. 2543-2547
Author(s):  
Shi Lun Feng ◽  
Yong Han ◽  
Jun Li ◽  
Pu Lin Li ◽  
Jie Liu
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Retaining Wall ◽  
Soft Soil ◽  
Monitoring Data ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Element Simulation ◽  
Excavation Process

Through the analysis on monitoring data of the deep foundation pit in Tianjin, it was observed that the lateral deformation of the retaining wall at the corner was smaller than the deformation in the middle. Based on the analysis of the results drawn from finite element simulation of the excavation process and the monitoring data, appropriate supporting structure stiffness parameters values used in Plaxis and Qimingxing are recommended for designing deep foundation pits in soft soil area.

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