scholarly journals Analysis of the influence about back side sand pile on the stability and deformation of the Pile foundation frame Seawall

2021 ◽  
Vol 638 (1) ◽  
pp. 012100
Author(s):  
Wu Xiongwei ◽  
Tang Mingli ◽  
Yao Yongxin
Keyword(s):  
Pile Foundation ◽  
Back Side ◽  
Sand Pile ◽  
The Stability

scholarly journals Stability Evaluation Method of Hole Wall for Bored Pile under Blasting Impact

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 79
Author(s):  
Qiuwei Yang ◽  
Zhikun Ba ◽  
Zhuo Zhao ◽  
Xi Peng ◽  
Yun Sun
Keyword(s):  
Pile Foundation ◽  
Evaluation Method ◽  
Impact Load ◽  
Stability Evaluation ◽  
Foundation Construction ◽  
Concentration Problem ◽  
Hole Wall ◽  
Failure Theory ◽  
Collapse Failure ◽  
The Stability

Blasting impact load may be encountered during the construction of some pile foundation projects. Due to the effect of blasting impact, hole collapse can easily occur in the hole-forming stage of pile foundation construction. In order to prevent hole collapse, it is very necessary to evaluate the stability of a pile hole wall before pile foundation construction. The calculation of hole collapse can usually be attributed to an axisymmetric circular hole stress concentration problem. However, the existing collapse failure theory of pile hole hardly considers the effect of blasting impact load. In view of this, this paper proposes the stability evaluation method of a pile hole wall under blasting impact. Compared with the existing collapse failure theory, the proposed method fully considers the effect of blasting impact stress. Using Mohr–Coulomb strength theory and symmetry analysis, the strength condition of collapse failure is established in this work for accurate evaluation of the stability of a hole wall. The proposed stability evaluation method is demonstrated by a pile foundation construction project of a bridge. Moreover, a shaking table test on the pile hole model was performed to verify the proposed method by experimental data. The results indicate the effectiveness and usability of the proposed method. The proposed method provides a feasible way for the stability analysis of a pile hole wall under blasting impact.

Study on the Stability and Structural Optimization of Self-Elevating Platform Pile Foundation

2012 ◽  
Vol 203 ◽  
pp. 325-328
Author(s):  
Xin Jie Chu
Keyword(s):  
Stress Concentration ◽  
Structural Optimization ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Reference Value ◽  
The Self ◽  
Foundation Design ◽  
Operation Stability ◽  
Soil Foundation ◽  
The Stability

This paper analyzes the stability and structural optimization of self-elevating platform pile foundation, preliminarily discusses the method of analyzing the bearing capacity of the layer soil foundation, and establishes the numerical computation models for the whole platform, pile, pile shoe, etc. Besides, through these analyses, the pile structure is optimized, and the stress concentration in the joint between pile and pile shoe is reduced. Also, this study is of reference value for the analysis on the self-elevating platform pile foundation design and the platform operation stability.

Instability Mechanism of Du Yun Pass Tunnel Entrance Weathered Stacking Area Analysis

2016 ◽  
Vol 858 ◽  
pp. 81-85
Author(s):  
Lin Liu ◽  
Yao Rong ◽  
Cheng Ke Zhang ◽  
Meng Yun Mao ◽  
Lu Lin Zhang
Keyword(s):  
Pile Foundation ◽  
Stability Problem ◽  
Surrounding Rock ◽  
Geological Condition ◽  
Construction Process ◽  
Instability Mechanism ◽  
Construction Scheme ◽  
The Stability ◽  
Tunnel Portal ◽  
Tunnel Entrance

The stability of the tunnel portal section under poor terrain and geological condition has always been the focus of construction safety. The stability problem has become more complex for the erosion accumulation area under the valley. In this paper, firstly the stability of the tunnel portal is classified. Combined with engineering cases, the FEM numerical method is used to simulate the supporting structure and construction process of the tunnel. Based on the distribution of the plastic zone and displacement of surrounding rock, the mechanism of the instability of the tunnel portal is analyzed. Through the optimized construction scheme that arranges pile foundation in tunnel arch foundation, the bearing capacity of foundation has been greatly improved, which has effectively prevented the instability of surrounding rock caused by the slope deformation and foundation settlement. The conclusions that have been drawn in this paper can be used for reference for related projects.

Analysis of Wave Loads on Pile-Group Foundation

2013 ◽  
Vol 680 ◽  
pp. 217-221 ◽  
Author(s):  
Yi Min Liu
Keyword(s):  
Circular Cylinder ◽  
Incident Wave ◽  
Pile Foundation ◽  
Pile Group ◽  
Wave Force ◽  
Wave Number ◽  
Back Side ◽  
Wave Loads ◽  
Pile Groups ◽  
Diffraction Wave

The grouping pile foundation is widely used in the construction of bridge over sea and its scale of construction is generally dominated by the wave force on the pile groups. Because of the presence of the slab, not only the incident wave but also the diffraction wave should be considered in calculating wave loads on pile groups. The diffraction from a submerged circular cylinder representing the slab was taken as an example, and wave loads on piles in the diffraction wave field were calculated by using Morison formula. Results show that the effect of slab decreases with the increase of incident wave number. Changing laws of different piles in the pile-group foundation varied with the submerged depth. Wave loads at the meeting-wave side of slab is larger than the back side of that. And the presence of slab caused the deflexion of inline force. The grouping piles coefficient can be taken as 0.7.

On the Soil-Structure Interaction Numerical Study of Strengthening Design of Sluice within Mining Subsidence Areas

2010 ◽  
Vol 163-167 ◽  
pp. 3640-3644
Author(s):  
Hong Chang ◽  
Jun Wu Xia ◽  
Hong Fei Chang ◽  
Feng Jie Zhang
Keyword(s):  
High Pressure ◽  
Pile Foundation ◽  
Soil Structure ◽  
Numerical Study ◽  
Mining Subsidence ◽  
Soil Structure Interaction ◽  
Analysis Model ◽  
Structure Interaction ◽  
Jet Grouting ◽  
The Stability

Finite element models, established using ANSYS, given the soil - structure interaction phenomena produced at the interface between the reinforced concrete structure and the soil, have been used to perform a parametric study of the strengthening design of the foundation and the sluice chamber within mining subsidence area. High pressure jet grouting pile is adopted to reinforce the foundation, this analysis model is simplified by the transformation from the pile foundation to the solid foundation, which reflects the characteristic of pile foundation. The strengthening design of the sluice chamber is a renovation from open style to frame, to increase the integral property. It is indicated that, using high pressure jet grouting pile to reinforce the foundation can apparently improve the stability of sluice in mining area. Nevertheless, it can't improve the stability of sluice through reinforcing the sluice chamber.

Crowd Evacuation Stability Based on Self-Organized Criticality Theory

2014 ◽  
Vol 501-504 ◽  
pp. 2403-2406 ◽  
Author(s):  
Rong Yong Zhao ◽  
Jian Wang ◽  
Wei Qing Ling
Keyword(s):  
Stability Analysis ◽  
Complex Problem ◽  
Unstable State ◽  
Sand Pile ◽  
Mapping Model ◽  
Self Organized ◽  
Self Organized Criticality ◽  
Crowd Evacuation ◽  
Crowd Motion ◽  
The Stability

In emergency, the crowd evacuation from public buildings is the most important issue to save human lives. Panic generation and spread normally can lead to the unstable state -stampede during the crowd motion. The stability of crowd evacuation is a complex problem being researched for decades. This paper introduces self-organized criticality(SOC) theory to build the mapping model from a collective crowd into a sand pile with SOC. Therefore, the complex problem of stability analysis for crowd evacuation is converted into sandpiper stability analysis in a relatively simpler way.

The Analysis of Finite Element about the Interaction between Seasonal Frozen Soil and Tower Pile Foundation

2014 ◽  
Vol 680 ◽  
pp. 220-223
Author(s):  
Feng Lin Gan ◽  
Di Zhao
Keyword(s):  
Finite Element ◽  
Pile Foundation ◽  
Element Model ◽  
Frozen Soil ◽  
Finite Element Software ◽  
Key Factor ◽  
Seasonal Frozen Soil ◽  
The Stability ◽  
Expansion Effect ◽  
Line Engineering

In the northern frozen-soil region,the heaving soil’s low temperature is the key factor that impacts the stability of foundation. This paper makes the heat-stress coupled numerical analysis on the cold expansion effect of the pile foundation to the Ulanhot-Baicheng 500kV transmission line engineering by finite element software ABAQUS. Firstly, the seasonal frozen soil’s temperature field should be calculated. Then, the temperature value acting as the temperature model’s initial condition is put into the structure model for computation, which can help to get the pile foundation’s stress field and strain field. The results show that, the stress state of pile-frozen soil under external load can be reflected accurately through the finite element model and the related parameters proposed, along with the finite element software.

Study of Safety Influence Factor of Bridge Substructure in Loess Gulch

2012 ◽  
Vol 546-547 ◽  
pp. 89-96
Author(s):  
Jin Wei ◽  
Zhong Ju Feng ◽  
Feng Ma
Keyword(s):  
Soil Erosion ◽  
Debris Flow ◽  
Pile Foundation ◽  
Influence Factor ◽  
Lateral Displacement ◽  
Bending Moment ◽  
Zero Point ◽  
Internal Force ◽  
Prevention Measures ◽  
The Stability

In this paper, the geology characteristics of loess gulch area were summarized. The mechanical models of the influence of landslide, debris flow and soil erosion on the safety of the pile foundation were created. The influence of the geology casualty on the safety of the pile foundation were analyzed. The analyses showed, when the pile foundation located the varied position of the loess gulch, the influence of soil erosion on the pile foundation character (acting force of pile side, free length of the pile, the first zero point position of the flexure curve, drawdown of the maximum bending moment, the increment of the lateral displacement, the drawdown of the lateral bearing capacity, the drawdown of the stability, etc.) were strikingly different. The calculation method of the pile and pier internal force was put forward under the function of landslide thrust and pressing force of debris flow. The corresponding prevention measures to different influencing factors were presented in the end.

Study on the Stability and Structural Optimization of Self-Elevating Platform Pile Foundation

2011 ◽  
Vol 65 ◽  
pp. 613-616
Author(s):  
Xin Jie Chu
Keyword(s):  
Stress Concentration ◽  
Structural Optimization ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Reference Value ◽  
The Self ◽  
Foundation Design ◽  
Operation Stability ◽  
Soil Foundation ◽  
The Stability

This paper analyzes the stability and structural optimization of self-elevating platform pile foundation, preliminarily discusses the method of analyzing the bearing capacity of the layer soil foundation, and establishes the numerical computation models for the whole platform, pile, pile shoe, etc. Besides, through these analyses, the pile structure is optimized, and the stress concentration in the joint between pile and pile shoe is reduced. Also, this study is of reference value for the analysis on the self-elevating platform pile foundation design and the platform operation stability.

Work Mechanisms of Pile Foundation in the Karst Region

2012 ◽  
Vol 170-173 ◽  
pp. 88-92 ◽  
Author(s):  
Gui Jun Wang ◽  
Yong Zhang
Keyword(s):  
Rock Mass ◽  
Bond Strength ◽  
Contact Surface ◽  
Pile Foundation ◽  
Scale Space ◽  
Karst Region ◽  
Original Design ◽  
Safety Coefficient ◽  
The Stability ◽  
Properties Of Soil

The stability and deformation characteristics of the pile foundation in the Karst region of the super big railway bridge Chaogou under different loading levels are analyzed using the FDM-software, FLAC3D. In the analyses the socketed depth of piles, the properties of soil and rock mass, the scale, space position and filling situation of the Karst caves and the features of the contact interfaces between piles and soil and rock mass were taken into account. The research results show that the original design of the pile foundation is safe and the safety coefficient is greater than 2. The bond strength of the contact surface between pile and soil and rock is a controlling factor for the stability of pile foundation. Therefore, injection after construction is suggested to be used when needed, in order to increase the bond strength of the contact surface. The research leads to a conclusion that the mechanisms and the characteristics of the rock socketed piles can be more clearly interpreted in numerical analyses by referring the principle of the interaction between piles and rock, pile foundation and Karst, resistance of both pile ends and sides.

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