Selection Analysis of Enclosure Structure for Deep Foundation Pit under Complicated Geological Conditions

2012 ◽  
Vol 446-449 ◽  
pp. 1400-1403
Author(s):  
Qi Hu ◽  
Sheng Ming Luo ◽  
Zhu Jin Jiang
Keyword(s):  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Selection Analysis ◽  
Geological Conditions

Research on Seepage Characteristics of Deep Cut Canal under Dewatering Well

2013 ◽  
Vol 438-439 ◽  
pp. 588-592
Author(s):  
Kai Yun Yang ◽  
Xiang Yu Li ◽  
Lin Hao Li ◽  
Quan Long Li
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Saturation Line ◽  
Deep Foundation ◽  
Seepage Field ◽  
Foundation Pit ◽  
Element Analysis ◽  
Deep Foundation Pit ◽  
Geological Conditions ◽  
Seepage Characteristics

In view of the problems of complex geological conditions with high underground water level, large permeability coefficient of soil and the presence of large seepage hazard of deep cut canal and deep foundation pit project of South-to-North Water Transfer Project, China, research on seepage characteristics of digging canals under dewatering well is carried out by finite element analysis, and the FORTRAN procedure is programmed. The three-dimensional finite element model of a digging canal is built, and the seepage field of the different conditions of the canal is simulated, the water head distribution, saturation line and leakages are obtained, and the rules and characteristics of steady seepage field under design impervious system are analyzed. The results indicate that the method can exactly determine the key overflow point and saturation line of canal, and well predict seepage field in canal. The results should be of guiding significance to design and construct retaining engineering in deep cut canal and deep foundation pit.

Effect of Staged Excavation on Retaining Structure in Soft Soil Area

2012 ◽  
Vol 170-173 ◽  
pp. 633-636 ◽  
Author(s):  
Jie Liu ◽  
Xin Guang Xu
Keyword(s):  
Soft Soil ◽  
Horizontal Displacement ◽  
Structure Type ◽  
Operating Conditions ◽  
Deep Soil ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Retaining Structure ◽  
Geological Conditions

Based on a deep foundation pit in Tianjin, the authors introduced the retaining structure type, surrounding conditions, and the geological conditions of proposed field. According to the engineering characteristics, the excavation was divided into three typical operating conditions. Based on the monitoring of staged excavation of deep foundation pit, analysis on horizontal displacement, deep soil displacement, column settlement and bracing axial force was carried out. The general rules of the deformation and internal force of retaining structures induced by staged excavation were given, which will provide the references for similar engineering.

Selection Analysis of Enclosure Structure for Deep Foundation Pit under Complicated Geological Conditions

2012 ◽  
Vol 446-449 ◽  
pp. 1400-1403
Author(s):  
Qi Hu ◽  
Sheng Ming Luo ◽  
Zhu Jin Jiang
Keyword(s):  
Soft Soil ◽  
Structure Design ◽  
Soil Conditions ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Structure Selection ◽  
Geological Conditions ◽  
Soil Foundation ◽  
Soft Soil Foundation

By comprehensive consideration of soil conditions, geometric shape of deep foundation pit and many other kinds of factors, enclosure structure design needs to select optimal supporting and enclosure system with safety, economy and construction feasibility. On case study of enclosure structure selection about typical soft soil foundation, this paper researches effects of force- deformation of enclosure structure by brace layout, and of economy and construction feasibility. The research results may offer reference for similar projects.

scholarly journals Safety Analysis of Deep Foundation Excavation in Water-Rich Soft Soils Based on BIM

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Huier Xu ◽  
Shoude Li
Keyword(s):  
Safety Analysis ◽  
Construction Safety ◽  
Information Modeling ◽  
Control Measures ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Soft Soils ◽  
Deep Foundation Pit ◽  
Geological Conditions ◽  
Research Studies

Recent years have seen a great concern on the construction safety of the deep foundation pit with complicated geological conditions due to an increasing number of accidents. However, there are not, currently, sufficient research studies on the safety analysis of the deep foundation pit in water-rich soft soils. As a result, dynamic predictions of the safety risk during the whole construction process are inadequate due to the lack of research studies. Therefore, this paper presents an approach for the construction safety of the deep foundation pit in water-rich soft soils, which combines the building information modeling (BIM), the finite element analysis (FEA), and the finite difference method (FDM). By using BIM technology, the author attempts to establish a 3D information model and a bracing structure model. Based on the application programming interface and the C# language, the data conversion from BIM-ANSYS-FLAC3D is realized. The author then attempts to analyze the ground surface settlement and horizontal displacement during the excavation of the deep foundation pit through FLAC3D, and the purpose of which is to identify potential safety hazards so that reasonable control measures can be taken. The approach presented in this article has been validated in the Project of Qinhuai River Ship Lock. Since the excavation and the after-construction stages of this project have been completed smoothly, this approach has been proved valid and applicable.

Study on Measures to Retain the Deep Foundation Pit for Soil-Rock Composition with Weak Intercalated Layers

2013 ◽  
Vol 405-408 ◽  
pp. 373-377
Author(s):  
Jing Wang ◽  
Feng Ming Sun ◽  
Jin You Chen ◽  
Chang Jie Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Balance Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Rock Composition ◽  
Deep Foundation Pit ◽  
Retaining Structure ◽  
Geological Conditions ◽  
The Stability

Aiming at a deep foundation pit in soil-rock composition with weak intercalated layers, in this paper, using the limit-balance method and finite element method to analyze the stability and deformation. The safety factor of foundation pit under the absence of retaining is much less than 1 through the limit-balance method, but through some retaining measures can guarantee its safety. According to the excavation of the foundation pit in special geological conditions, it takes pile-anchor retaining structure in upper and soil nailing in the lower part. Using the finite element to carry out dynamic simulation for the whole project, the results show that: this form of retaining can be very good to ensure the excavation of the foundation pit in the geological conditions, and it may be helpful for similar projects

Analysis of Locking Value of Anchor Cable in Pile Anchor Supporting Structure

2013 ◽  
Vol 838-841 ◽  
pp. 203-208
Author(s):  
Jie Chen ◽  
Dong Wang ◽  
Chun Lei Feng
Keyword(s):  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Anchor Cable ◽  
The North ◽  
Relaxation Loss ◽  
Geological Conditions ◽  
Treatment Measures ◽  
The Stability

This paper analyses the problem of locking value of anchor cable of pile anchor supporting of a deep foundation pit in the north of Kunming city. There are many influencing factors of locking value of anchor cable such as relaxation loss of anchor cable materials, tensioning system, pre-stress loss caused by anchorage friction, geological conditions and so on. And the author put forward the corresponding treatment measures for achieving the stability of supporting structure.

Design Scheme and Construction Technology of Combined Support for a Deep Foundation Pit Excavation

2013 ◽  
Vol 353-356 ◽  
pp. 819-822 ◽  
Author(s):  
Mai Wu ◽  
Xin Zhao ◽  
Kai Liu ◽  
Chun Lei Wang ◽  
Hui Xuan Geng
Keyword(s):  
Horizontal Displacement ◽  
Construction Technology ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Design Scheme ◽  
Geological Conditions ◽  
Design Requirements ◽  
Construction Organization ◽  
Support Engineering

A deep foundation pit project in Changsha City covers an area of about 63000m2, the largest excavation depth of the pit is 16.2 m, so it belongs to the deep and large foundation supporting engineering. By comprehensive analysis of the proposed construction site environment conditions and engineering geological conditions the different combined supporting schemes are adopted in different domains separately. In this paper the design schemes of the combined supporting technology are introduced. The problems encountered in the excavation construction process and the corresponding measures being taken are analyzed in detail. The results show that the design scheme is reasonable. Both horizontal displacement and settlement can meet specification and design requirements. At the same time the reasonable construction organization makes the support engineering be finished within the scheduled term, which saves the precious time for the following construction procedure. Furthermore it provides guidance for similar projects.

Study on Methods for Deep Foundation Pit Supporting in Beijing

2013 ◽  
Vol 639-640 ◽  
pp. 608-614
Author(s):  
Wen Hui Tan ◽  
Cong Cong Li ◽  
Hong Bao Sun
Keyword(s):  
High Reliability ◽  
Small Displacement ◽  
Beijing City ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Underground Pipelines ◽  
Specific Analysis ◽  
Geological Conditions ◽  
Pulling Force

Abstract. Slope supporting piles and enlarged prestressed anchorage was used to support the deep foundation pit in Beijing which is a complicated engineering and influenced by many factors that locating in the midtown of Beijing city and nearby the construction, traffic trunk and underground pipelines based on the hydrological datum and geological conditions through the specific analysis of the actual conditions, surroundings and geological conditions of the site. Then taking full advantages of the large resist pulling force of single anchorage, small displacement and high reliability of enlarged prestressed anchorage and ensures the engineering be carried out safely and successfully.

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