scholarly journals Analysis of the Necessity for Steel Changing Brace Erection During the Foundation Pit Excavation in Metro Station End Shaft

2021 ◽  
Vol 787 (1) ◽  
pp. 012048
Author(s):  
Wang Guo ◽  
Junyan Zhao
Keyword(s):  
Foundation Pit ◽  
Metro Station

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.

Research on Deformation Law of Deep Excavation Supporting Structures in Beijing Metro Station

2011 ◽  
Vol 243-249 ◽  
pp. 2338-2344
Author(s):  
Qing Yuan Li ◽  
Yang Wang
Keyword(s):  
Horizontal Displacement ◽  
Internal Force ◽  
In Situ Monitoring ◽  
Deep Excavation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Metro Station ◽  
Deep Foundation Pit ◽  
Deformation Law

Taking deep excavation engineering in North Region of Senlin Park Station of Beijing Olympic Subway branch as engineering background, deformation law of enclosure structure of deep excavation are studied by the in-situ monitoring means .It shows that the maximum horizontal displacement of retaining pile is closely related with excavation depth and time. When the deep foundation pit is excavated to a certain depth, and steel brace hasn’t been erected, horizontal displacement of the pile tops is maximum. The location of the maximum horizontal displacement shifts down with foundation pit excavation and steel brace erection. With steel brace application, steel axis force decrease, so steel brace can effectively control horizontal displacements of retaining pile and internal force of steel in the pile. In addition, temperature has a certain effect to axis force of steel brace.

scholarly journals Study on soil reinforcement param in deep foundation pit of marshland metro station

Heliyon ◽  
2019 ◽  
Vol 5 (11) ◽  
pp. e02836 ◽  
Author(s):  
Wei Wang ◽  
Zhao Han ◽  
Jun Deng ◽  
Xinyuan Zhang ◽  
Yanfei Zhang
Keyword(s):  
Soil Reinforcement ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Metro Station ◽  
Deep Foundation Pit

Monitoring of Deformation Laws of Deep Excavation in Metro Station

2011 ◽  
Vol 99-100 ◽  
pp. 1141-1145
Author(s):  
Qing Yuan Li
Keyword(s):  
Monitoring Program ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Basic Principles ◽  
Metro Station ◽  
Deep Foundation Pit ◽  
Site Monitoring ◽  
Information Construction ◽  
Engineering Information ◽  
Engineering Environment

Combined with the Engineering environment and the requirements of construction of the deep foundation of metro station of South Gate in Xi'an, and in accordance with the basic methods and the basic principles of the monitoring of the construction of deep foundation, it gives a monitoring program of the deformation of the deep foundation pit and researches on in-site monitoring for the deformation of deep foundation, to ensure the safety of metro station construction. At the same time, it focuses on an analysis of the horizontal deformation of the retaining piles and the axial force of steel support, to provide a reference for the similar engineering information construction in the future.

Safety Analysis on the Structure of an Existing Metro Station Impacted by the Construction of an Adjacent Building

2012 ◽  
Vol 238 ◽  
pp. 777-782
Author(s):  
Li Heng Ma ◽  
Qing Huai Liang ◽  
Yi Fan Liu ◽  
Ming Ran He
Keyword(s):  
Element Model ◽  
Building Construction ◽  
Normal Operation ◽  
Main Body ◽  
Foundation Pit ◽  
Metro Station ◽  
Adjacent Building ◽  
Calculation Results ◽  
Structural Deformations ◽  
Station Structure

Structural deformations of the existing metro station caused by adjacent building construction should be controlled strictly so as to keep the normal operation of the existing metro station and guarantee the safety of the station structure. Based on a foundation pit excavation and building project which is adjacent to an existing metro station in Beijing, a 3D finite element model of foundation pit, metro station and surrounding soil is established. Then, the structural deformations of the main body structure (rail area), the passageway and the fire fighting passageway in different construction stages are obtained. The control values of the station structure deformation during building construction process are proposed according to the calculation results.

scholarly journals Collapse Risk Analysis of Deep Foundation Pits in Metro Stations Using a Fuzzy Bayesian Network and a Fuzzy AHP

2020 ◽  
Vol 2020 ◽  
pp. 1-18 ◽  
Author(s):  
Guohua Zhang ◽  
Chengtang Wang ◽  
Yuyong Jiao ◽  
Hao Wang ◽  
Weimin Qin ◽  
...  
Keyword(s):  
Risk Analysis ◽  
Bayesian Network ◽  
Fuzzy Ahp ◽  
Fault Tree Analysis ◽  
Expert Elicitation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Metro Station ◽  
Potential Risk Factors ◽  
Effective Decision Making

Collapse risk analysis is of great significance for ensuring construction safety in foundation pits. This study proposes a comprehensive methodology for dynamic risk analysis of foundation pit collapse during construction based on a fuzzy Bayesian network (FBN) and a fuzzy analytical hierarchy process (FAHP). Firstly, the potential risk factors contributing to foundation pit collapse are identified based on the results of statistical analysis of foundation pit collapse cases, expert inquiry, and fault tree analysis. Then, a FAHP and improved expert elicitation considering a confidence index are adopted to elicit the probability parameters of the BN. On this basis, quantitative risk reasoning and sensitivity analysis of foundation pit collapse are achieved by means of fuzzy Bayesian inference. Finally, an actual deep foundation pit in a metro station was used to illustrate a specific application of this approach, and the results were in accordance with the field observations and numerical simulation results. The proposed approach can provide effective decision-making support for planners and engineers, which is vital to the prevention and control of the occurrence of the foundation pit collapse accidents.

scholarly journals Research on Disaster-Control Method of Metro Station in Soft Fluid-Plastic Stratum

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Wang Hongbo ◽  
Qingsong Zhang ◽  
Liu Rentai ◽  
Peng Jiang ◽  
Yankai Liu
Keyword(s):  
Control Method ◽  
Water Inrush ◽  
Field Tests ◽  
Geological Condition ◽  
Foundation Pit ◽  
Metro Station ◽  
Grouting Pressure ◽  
Behavioral Mechanism ◽  
Grouting Reinforcement ◽  
Inrush Water

Soft and broken ground is a common geological condition for subway pit water damage. The complex hydrogeological environment is the main cause of frequent disasters. It relied on the inrush water project of the soft fluid-plastic stratum in the pit of the Shang Yuanmen station in Nanjing. And based on the geological data and the actual site of the project, the station was evaluated for hazards and analysis of major and difficult points. Combined with a variety of geophysical exploration methods, the source of water in the foundation pit and the key areas for pulp reinforcement was obtained. Based on field tests and indoor tests of grouting reinforcement, the parameters before and after grouting reinforcement were analyzed. The effect of material proportioning and grouting pressure on the parameters of stratum reinforcement was studied. It revealed the effect of the behavioral mechanism of material properties and grouting pressure on different mechanical indexes. It creatively proposes a localized controlled grouting process and uses COMSOL modeling to explain its reinforcement mechanism. In addition, foundation pits applied a full set of monitoring system. Finally, a complete set of comprehensive control methods were formed for water inrush in soft fluid-plastic stratum of complex urban strata. Then, the methods are implemented at the project site. Practice has proved that this method successfully seals the inrush water and reinforces foundation pits while ensuring the safety of foundation pits and surrounding construction pipelines. It is hoped that this method can be used as a reference for similar projects.

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