Case study of multi-objective risk analysis in deep foundation pit based on Entropy Method

2011 ◽  
Author(s):  
Lu Yifan ◽  
Li Huiqiang
Keyword(s):  
Risk Analysis ◽  
Entropy Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Multi Objective ◽  
Objective Risk

A Case Study on Pit Failure Risk of Deep Diaphragm Wall

2014 ◽  
Vol 584-586 ◽  
pp. 1975-1978
Author(s):  
Shi Lun Feng ◽  
Qing Qing Guo ◽  
Yong Hong Wu
Keyword(s):  
Case History ◽  
Lessons Learned ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Failure Risk ◽  
The Subject ◽  
Bracing System ◽  
Potential Disaster

Temporary bracing is often viewed as an unnecessary step in the process of constructing a structural facility. Unfortunately, many times this often-neglected step becomes the subject of avoidable litigation and lawsuits. This paper presents a remedy case of a deep foundation pit during the construction of the bracing system located at the business center in HePing district, TianJin. Through frequent inspection and suitable countermeasures, the potential disaster was mitigated in time. There were some lessons learned from this case history.

Performance of a deep foundation pit supported by suspended piles in soil and rock strata: a case study

2021 ◽  
Vol 14 (21) ◽  
Author(s):  
Yuan-shun Shen ◽  
Jie Yin ◽  
De-Sheng Zhu ◽  
Daniel Kumah ◽  
Wen-fang Guo ◽  
...  
Keyword(s):  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Rock Strata

Application of BP-ARMA Combined Model Based on Entropy Method in the Prediction of Circle Beam Displacement of Foundation Pit

2014 ◽  
Vol 697 ◽  
pp. 530-534
Author(s):  
Yu Bo Hu ◽  
Fei Shao ◽  
Ya Xin Huang ◽  
Ya Wen Liu ◽  
Jin Jun Liang
Keyword(s):  
Neural Network ◽  
Time Series ◽  
Bp Neural Network ◽  
Entropy Method ◽  
Deep Foundation ◽  
Combined Model ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Beam Displacement

The prediction of deformation of foundation pit’s supporting structure is the basis of construction control of deep foundation pit. Meanwhile, it is vital to the safe excavation of foundation pit. In the work, the 1st project of Huaqiao in Jiantao Square of Kunshan City is chosen. Besides, model of combination based on entropy method is built to predict the displacement of circle beam with BP neural network and ARMA time series model. Finally, the analysis shows that combination models improve overall prediction on the premise of better predicting accuracy. Thus, it is of practical value.

scholarly journals Safety Prediction of Deep Foundation Pit Based on Neural Network and Entropy Fuzzy Evaluation

2021 ◽  
Vol 233 ◽  
pp. 03001
Author(s):  
Xie Xiudong ◽  
Pan Caizhen
Keyword(s):  
Neural Network ◽  
Evaluation Method ◽  
Fuzzy Comprehensive Evaluation ◽  
Development Trend ◽  
Entropy Method ◽  
Monitoring Data ◽  
Fuzzy Evaluation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit

The monitoring data can effectively reflect the safety status of the project during the construction of deep foundation pit, and the risks existing in the project can be discovered in time and the development trend can be reasonably predicted through the processing and analysis of the existing monitoring data. In this paper, a deep foundation pit in compound soil area of a coastal city was taken as an example, the BP neural network was taken to predict the monitoring data in the next stage, the entropy method was utilized to determine the weight of the evaluation index according to the predicted value, and the fuzzy comprehensive evaluation method was used to quantitatively describe the future safety status, so as to formulate targeted countermeasures and improve the construction safety.

Exploration and Practice of Innovative Support System of Large-Scale Deep Foundation Pit in Beijing

2013 ◽  
Vol 838-841 ◽  
pp. 747-755
Author(s):  
Shen Hua Jiao ◽  
Jin An Wang ◽  
Ya Ming Liu
Keyword(s):  
Large Scale ◽  
Development Process ◽  
Shallow Foundation ◽  
Underground Space ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Support Design ◽  
Deep Foundation Pit ◽  
Design Concepts

Foundation pit engineering is a critical part during the development process of underground space. With the increasing demands of underground space, foundation pit engineering is exposed to new challenges. This article firstly reviews the main features of shallow foundation pits in Beijing as well as the relevant design concepts of support, and then elaborates the features and challenges of urban large-scale deep foundation pits; a case study was introduced with the exploring practice of design and construction of the large-scale deep foundation pit of Wangjing SOHO project, the innovations of support design for this foundation pit are summarized; new prospects for development of support techniques of foundation pits are proposed.

scholarly journals A Case Study on Field Monitoring Analysis of Deep Foundation Pit in Soft Soils

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaoshuang Zhang ◽  
Xiuchuan Zhang ◽  
Yunshan Han
Keyword(s):  
Lateral Displacement ◽  
Ground Surface ◽  
Field Monitoring ◽  
Diaphragm Wall ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Ground Surface Settlement ◽  
Maximum Lateral Displacement

Field monitoring in the process of excavation of foundation pit is an important measure to reduce the risk. This paper describes a case study of the filed monitoring data during the process of deep foundation pit excavation in soft soil areas. The displacements of the diaphragm wall top were analysed and found that the horizontal displacement showed the convex shape, while the vertical displacement showed the concave shape. Based on the field monitoring data, the deformation mode of lateral displacement of the diaphragm wall belonged to the composite mode. The relationship between maximum lateral displacement and excavation depth showed a strong linear correlation. The horizontal displacements of bracing pillar decreased with the increasing of bracing stiffness, while the effect of bracing stiffness on vertical displacements of bracing pillar could be ignored. The settlement profile computed using the method of Hsieh and Ou was in good agreement with the field observations and better described the development trend of the ground surface settlement. The ratio of the maximum ground surface settlement (δvm) to the maximum lateral displacement of the diaphragm wall (δhm) was in the range of 0.74∼0.88, belonging to the range of 0.5∼1.0 proposed by Hsieh and Ou. This paper provides a reference basis and related guidance for similar projects.

scholarly journals Monitoring analysis of influence of extra-large complex deep foundation pit on adjacent environment: a case study of Zhengzhou City, China

2020 ◽  
Vol 11 (1) ◽  
pp. 2036-2057
Author(s):  
Danqing Song ◽  
Zhuo Chen ◽  
Lihu Dong ◽  
Gaojie Tang ◽  
Kelu Zhang ◽  
...  
Keyword(s):  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Large Complex
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