scholarly journals Deformation Response and Safety Evaluation of Buildings Affected by Subway-Station Construction

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Chunlei Feng ◽  
Dingli Zhang ◽  
Hualao Wang ◽  
Xuan Zhang
Keyword(s):  
Relative Position ◽  
Evaluation Method ◽  
Safety Evaluation ◽  
Environmental Safety ◽  
Horizontal Distance ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Degree Of Deformation ◽  
Beijing Area ◽  
Subway Stations

Based on the sand and pebble stratum in the Beijing area, this paper studies the interaction between deep-foundation-pit excavation for subway stations and surrounding buildings using an orthogonal test. Moreover, it considers the relative position relationship between buildings and how the foundation pit is set up as well as different design schemes for foundation pits and the surrounding buildings. Results show that the horizontal distance s between the building and foundation pit and stiffness of the building itself have a clear impact on the differential settlement δij and relative deflection Δ, and the degree of deformation of the building near the corner of the foundation pit is complex. Simultaneously, based on numerical simulation results, the deformation characteristics and degree of deformation of the building under different relative position relationships with the foundation pit are analyzed. Finally, by establishing a relationship among the comprehensive deformation index Dj, surrounding environmental safety evaluation index Sj, and scheme safety grade Lj, a multiangle safety evaluation method for buildings affected by foundation-pit construction is formed, which can provide a reference for the research and design of similar projects.

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.

scholarly journals Deformation Law of the Diaphragm Wall during Deep Foundation Pit Construction on Lake and Sea Soft Soil in the Yangtze River Delta

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yuan Mei ◽  
Dongbo Zhou ◽  
Xueyan Wang ◽  
Liangjie Zhao ◽  
Jinxin Shen ◽  
...  
Keyword(s):  
Soft Soil ◽  
Yangtze River Delta ◽  
Diaphragm Wall ◽  
Lateral Deformation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Deformation Law ◽  
Wall Deformation ◽  
Subway Stations

So far, there have been a large number of diaphragm walls in the Yangtze River Delta as engineering examples of deep foundation pit maintenance structures in subway stations, but there is a lack of systematic research and summary on the deformation characteristics of ground connecting walls. This study aimed to clarify the deformation law of the diaphragm wall during the excavation of a deep foundation pit in a soft soil region. Based on the monitoring data of the diaphragm wall of the deep foundation pit of the Hangzhou metro station, the monitoring data of the deep foundation pits of 15 subway stations in Shanghai and Ningbo cities around Hangzhou were considered. Grouping and classification methods were used to analyze the similarities and differences in the deformation characteristics of the diaphragm wall in the three regions. The results indicate the following: the maximum lateral deformation of the diaphragm wall in Hangzhou increases linearly with the relative depth of the maximum lateral deformation. The maximum lateral deformation of the foundation pit in Hangzhou is 0.072% H∼0.459% H, with a mean of 0.173% H. The wall deformation in Hangzhou varies significantly with the depth of the foundation pit, but the influence of the depth of the foundation pit on the wall deformation is considerably less than that in Shanghai and Ningbo. The corresponding position of the maximum lateral deformation in the excavation depth increases linearly with the excavation depth of the foundation pit, and the corresponding position of the lateral deformation of the diaphragm wall in Shanghai is more affected by the excavation depth of the foundation pit. The lateral deformation of the diaphragm wall increases rapidly in the range of 0 H–0.5 H, and the maximum lateral deformation occurs at 0.5 H–1.1 H.

Safety Assessment of Subway Station Operation Based on Grey Clustering Method

2013 ◽  
Vol 748 ◽  
pp. 1212-1216
Author(s):  
Xue Mei Xiao ◽  
Yan Hui Wang ◽  
Li Min Jia
Keyword(s):  
Safety Assessment ◽  
Evaluation Method ◽  
Safety Evaluation ◽  
Evaluation Index ◽  
Subway Station ◽  
Clustering Method ◽  
Weighting Method ◽  
Grey Clustering ◽  
Subway Stations ◽  
Beijing Subway

The safety evaluation index of subway station operation is established from the passengers, equipments and facilities ability, emergency ability and other aspects. Specific to the limitation the traditional entropy weighting method, the improved vertical and horizontal weighting method is puts forward, and safety evaluation method of the subway station operation based on grey clustering method is proposed. Finally, taking the Beijing subway stations in China as an example, the rationality and reliability of this method is verified.

Safety Evaluation of Underground Environment Using Fuzzy Approach with Dynamic Weight

2011 ◽  
Vol 347-353 ◽  
pp. 3815-3820
Author(s):  
Ke Lei Sun ◽  
Hong Tao Zhang ◽  
Na Wang
Keyword(s):  
Evaluation Method ◽  
Influence Factors ◽  
Safety Evaluation ◽  
Environmental Safety ◽  
Coal Industry ◽  
Fuzzy Evaluation ◽  
Evaluation Indexes ◽  
Dynamic Weight ◽  
Weight Method ◽  
Available Information

Evaluating underground environmental safety is not an easy task as it involves many variable evaluation indexes which are immeasurable, vague and uncertain. Also, the available information for evaluation may be incomplete due to the difficulty of underground data acquisition and complexity of the influence factors. Considering the different effect of various evaluation indexes on underground environmental safety in different conditions, a dynamical weight algorithm of various indexes is presented. The fuzzy evaluation method with dynamic weight is applied in evaluating underground environmental safety at one of the coal mines in YangQuan coal industry. Findings conclude that the proposed dynamic weight method is better than the traditional method, which gives a promising prospect in underground environmental safety evaluation. And it provides a more reasonable and intelligent evaluation with accurate results.

A Residential Building Crack Test and Construction Safety Assessment

2012 ◽  
Vol 188 ◽  
pp. 119-122
Author(s):  
Ju Gang Luo ◽  
Jin Yang Zhang ◽  
Qing Song Zhang
Keyword(s):  
Structural Integrity ◽  
Safety Evaluation ◽  
Residential Building ◽  
Structural Safety ◽  
Building Structure ◽  
Deep Foundation ◽  
Foundation Pit ◽  
The North ◽  
Northern Side ◽  
Building Engineering

A residential building, a brick/concrete structure built up in 1990s was used for many years. Since a deep foundation pit construction was being done in the north, the residents were worrying about the cracks in the building and its safety. Therefore, the following works were done such as the spot checks of the building engineering quality were done; the test and analysis were carried out over the cracks development after the foundation pit was backfilled, the influence assessment of the foundation construction under the mutual effects of pilings and anchor rods over the residential building structure was also conducted; finally the recheck calculation and safety evaluation were made over the building structure. The result shows that the foundation digging leads to new cracks on the nearby residential building but does not endanger its structural safety; after the foundation was backfilled, the hidden danger on the building’s northern side slop was eliminated and the structure cracks tend to be stable; the complete engineering structure is safe and in conformity with the requirements of safety and anti-vibration during the construction period, however, the multiple-pore slabs’ piecing affects the structural integrity and vibration proof performance.

Application of Comprehensive Evaluation Method to Foundation Pit Engineering

2012 ◽  
Vol 446-449 ◽  
pp. 1775-1780
Author(s):  
Jian Xin Zhang ◽  
Jia Li Dai ◽  
Bin Liu
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Synthetic Evaluation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Safety Risk ◽  
Deep Foundation Pit ◽  
Comprehensive Evaluation Method ◽  
Risk Condition

Based on the monitoring data of the deep foundation pit, established an adjacent deep foundation pit safety risk fuzzy synthetic evaluation model, and then determine safety grades , using the method to evaluate the safety of the environment surrounding the foundation pit. Practice proves that the method can reflect the risk condition of the pit, and provided a new way to check the security of the pit.

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.

Monitoring Analysis and Safety Evaluation of Deep Foundation Pit under Complex Conditions

2014 ◽  
Vol 580-583 ◽  
pp. 636-640 ◽  
Author(s):  
Xu Tao Zhang ◽  
Qiang Yong Zhang ◽  
Chao Wang ◽  
You Fa Wang
Keyword(s):  
Great Influence ◽  
Safety Evaluation ◽  
Horizontal Displacement ◽  
Construction Time ◽  
Deep Soil ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Deformation Control ◽  
Supporting Structure

The horizontal displacement of pit top and horizontal displacement in deep soil of underground garage deep foundation pit in Radio and TV centre of Shandong province was analyzed. Combing the deformation control value of foundation pit, we thought that the supporting structure was safe and reliable. The supporting structure could not only meet the strength requirements but also meet the deformation control requirements. This deep foundation pit was a successful case under complex conditions. Analyzing the variation rules between monitoring data and construction time, the instructive conclusions were obtained. The deformation of foundation pit external corner was largest. The external corner should be avoided in foundation pit. The dynamic loads around foundation pit had a great influence on the safety and stability of pit. The rainfall was disadvantage factors, so the construction of foundation pit should keep away from the rainy season. The foundation pit floor could limit soil deformation and improve the safety of pit. The pit floor should be constructed as early as possible.

Environmental Safety Evaluation of High-Rise Buildings in Baotou

2012 ◽  
Vol 178-181 ◽  
pp. 943-946
Author(s):  
Yu Xian Ding ◽  
Ning Bo Ma ◽  
Lei Ding
Keyword(s):  
Evaluation Method ◽  
Rapid Development ◽  
Safety Evaluation ◽  
Environmental Safety ◽  
Scientific Development ◽  
Fuzzy Evaluation ◽  
Qualitative And Quantitative Analysis ◽  
Practical Situation ◽  
Qualitative And Quantitative ◽  
High Rise

The rapid development of high-rise buildings has brought difficulties to urban environmental safety. Fuzzy evaluation method is adopted to conduct qualitative and quantitative analysis of Baotou's high-rise architectural environment through a close combination of the course and the cutting-edge technology of the scientific development of architectural environment. The analysis is implemented in three aspects including body safety, resource safety and social ecology safety. It also analyses the practical situation of Baotou's high-rise architectural environment through real cases, hoping to provide theoretical direction for the improvement of Baotou's urban environmental safety.

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