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.

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.

Metro Station Deformation Caused by Deep Foundation Pit Construction

2014 ◽  
Vol 580-583 ◽  
pp. 1061-1064
Author(s):  
Chun Lei Xin ◽  
Bo Gao
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Simulation Method ◽  
Main Body ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Metro Station ◽  
Deep Foundation Pit ◽  
Construction Methods ◽  
Transfer Station

Many excavation and backfill methods can be used to construct a deep foundation pit, but foundation pit construction will undoubtedly affects security of existing metro station. This research based on a transfer station of Chengdu Metro, three-dimensional numerical simulation method was used to analyze the deformation of metro station by changing construction methods of foundation pit. The results show that: (1) Both excavation and backfill methods of foundation pit have a significant effect on connection segments of metro station. (2) The main body of metro station is largely unaffected by foundation pit construction but it has been in the process of subsidence. (3) The more the construction steps of foundation pit are, the more slowly the displacement of metro station changes. The above results certainly contribute to research and develop new types of construction methods for complicated metro station.

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