Numerical Simulation Analysis of Bearing Characteristics on Super-Large Diameter Rock Socketed Pile

2014 ◽  
Vol 580-583 ◽  
pp. 432-435 ◽  
Author(s):  
Cheng Zhong Gong ◽  
Chun Lin He ◽  
Ming Xing Zhu
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Flow Analysis ◽  
Test Method ◽  
Main Stress ◽  
Pile Cap ◽  
Pile Caps ◽  
S Curve ◽  
Stress Flow

Wujiang Bridge is located on the Wujiang River in Chongqing Province in China. Based on test method of numerical simulation, the bearing characteristics of this large-diameter rock-socket pile with super-thick pile caps have been analyzed, including pile foundation load-bearing characteristics, pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that Q-s curve of this kind of pile is approximate to linear. Under the action of ultimate load, the main load was supported by pile end résistance. And according to main stress distribution of pile cap, there is an obvious spatial truss effect phenomenon in it.

Influence of Pile Cap Thickness on the Bearing Characteristics of Group Piles Foundation

2014 ◽  
Vol 638-640 ◽  
pp. 471-474
Author(s):  
Chun Lin He ◽  
Cheng Zhong Gong
Keyword(s):  
Large Diameter ◽  
Flow Analysis ◽  
Load Sharing ◽  
Element Model ◽  
Test Method ◽  
Sharing Value ◽  
Pile Cap ◽  
Load Increase ◽  
Pile Caps ◽  
Side Friction

Based on test method of numerical simulation, the bearing characteristics of large-diameter rock-socket pile with different super-thick pile caps have been analyzed, including the finite element model, Numeric Simulation of different heights of pile cap, Pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that pile cap thickness has little influence on pile bearing capacity for the thick pile cap, when thickness of pile cap increases to a certain thickness, it would not affect the settlement characteristics under the pile caps. With the increase of the thickness of cap, the pile side friction load sharing value of pile side friction decreases, while the load sharing value of pile tip load increase, and soil force under the pile cap does not change with the different thickness of pile cap. However,it is advantageous to increase cap thickness to reduce tensile stress.

scholarly journals Numerical Simulation Analysis of Combined Seismic Response for Rock-Lining-Water in Hydraulic Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Guoqing Liu ◽  
Yanhong Zhang ◽  
Ming Xiao
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Water Diversion ◽  
Seismic Stability ◽  
Central Difference ◽  
Element Analysis ◽  
Internal Water ◽  
Lining Structure

In order to explore the influence of internal water on the seismic response of hydraulic tunnel, the combined mechanical analysis models of multimaterial including surrounding rock, lining structure, and internal water are built. Based on the explicit central difference method, the dynamic finite element analysis methods for rock, lining, and water are discussed, respectively. The dynamic contact force method is used to simulate the rock-lining contact interaction, and the arbitrary Lagrange-Euler (ALE) method is used to simulate the lining-water coupling interaction. Then a numerical simulation analysis method for combined seismic response of rock-lining-water system in hydraulic tunnel is proposed, and the detailed solving steps are given. This method is used to study the seismic stability characteristics of the water diversion tunnel in a hydropower station, and the displacement, stress, and damage failure characteristics of the lining structure under the conditions of no water, static water, and dynamic water are comparatively analyzed. The results show that the hydrostatic pressure restricts the seismic response of the lining, while the hydrodynamic pressure exacerbates its seismic response and leads to damage, separation, and slip failure appearing on the haunch, which can provide a scientific reference for the seismic design of hydraulic tunnel with high water head and large diameter.

Numerical Simulation Analysis for Foundation Settlement Sensitivity on LiShuiGou Aqueduct of ShiMen Reservoir

2011 ◽  
Vol 71-78 ◽  
pp. 1601-1604
Author(s):  
Di Zhang
Keyword(s):  
Numerical Simulation ◽  
Design Theory ◽  
Simulation Analysis ◽  
Design Method ◽  
Large Diameter ◽  
Orthogonal Experimental Design ◽  
Foundation Settlement ◽  
Pile Diameter ◽  
Constitutive Mode ◽  
Pile Length

The foundation of LiShuiGou Aqueduct of ShiMen Reservoir is composed of long-short and large diameter piles, with great diameter and length differences between these new and old piles. Numerical simulation of the FEM software ADINA and the orthogonal experimental design theory are applied to explore the sensitivity of long-short pile foundation settlement, under different pile length, pile diameter, pile space, and soil constitutive model, with foundation settlement as the evaluation index. The results show that the descending order of the sensitivity of four factors is: pile length > pile diameter > pile space > soil constitutive mode. Some scientific and rational approaches and basis are consequently provided to explore the most effective reinforcement measures and design method for long-short and large diameter piles.

scholarly journals Numerical Simulation Analysis of Cutter Head of Large Diameter Metro Shield with Soft Upper and Hard Bottom

2021 ◽  
Vol 632 ◽  
pp. 022067
Author(s):  
Qingfei Luo ◽  
Quan Cao ◽  
Wei Li ◽  
Yanjun Xue ◽  
Qingming Meng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Cutter Head

Numerical Simulation Analysis of Bearing Performance of Extra-Long and Large-Diameter Single Pile

2014 ◽  
Vol 1065-1069 ◽  
pp. 943-948
Author(s):  
Zhi Meng Zhao ◽  
Jin Yi Chai ◽  
Cai Xia Fan
Keyword(s):  
Numerical Simulation ◽  
Elastic Modulus ◽  
Bearing Capacity ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Ultimate Bearing Capacity ◽  
Single Pile ◽  
Pile Shaft ◽  
Settlement Ratio ◽  
Pile Length

The effects of pile diameter, the property of pile end bearing stratum, the material parameters of pile shaft and the changes of pile length on the bearing performance of extra-long and large-diameter single pile were examined with the finite element software ABAQUS to make the numerical simulation analysis, by establishing the overall axial symmetry model, which was based on the data of static load test of single pile at the Yellow River Bridge site. The results show that the ultimate bearing capacity of single pile, the stiffness and the end resistance ratio would increase gradually, whereas the compression settlement ratio decreases slowly; the pile end grouting can significantly increase the ultimate loads, and therefore, improve the bearing performance of piles, but it has little effect on the stiffness of pile when loading was smaller; the elastic modulus of pile shaft has no effect on the ultimate bearing capacity of friction piles, little on the end resistance ratio, while the pile compression settlement ratio would gradually decrease and the stiffness would increased with the increase of the elastic modulus of pile shaft, and this increase of stiffness would slow down with the increase of elastic modulus of pile shaft; it is unreasonable to improve the ultimate bearing capacity of extra-long single pile only by means of increasing the pile length.

3-D Numerical Simulation for Large-Diameter Cast-In Situ Tubular Pile

2011 ◽  
Vol 71-78 ◽  
pp. 4009-4013
Author(s):  
Jun Li ◽  
Jian Zhou
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Large Diameter ◽  
Element Model ◽  
Soil Core ◽  
Settlement Behavior ◽  
Element Computation ◽  
S Curve ◽  
Sphere Of Influence

Large-diameter cast-in-situ tubular pile (shorted as LTP) is a new, efficiency and energy saving, environmental protection pile and has been widely put into use in the foundation treatment. Using finite element method (FEM) to analyze and study the behavior of LTP is a very effective research method. This paper adopted the finite element computation software ANSYS 11.0 to conduct a 3-D numerical simulation for the LTP of a typical project. In this paper, it introduced how to realize the finite element model, specifically discussed how to select the appropriate key parameters and proposed an effective method and steps base on experience to determine the key parameters. By calculating, compared the calculated Q-S curve with the measured one and then analyzed the settlement behavior and the inner friction distribution of LTP, it is found that the inner friction only emerge at the bottom of the soil core and the upper part nearly does not have friction. The critical point in depth decreased and the maximum inner friction increased with the increasement of the load. Under the ultimate load, the sphere of influence of LTP decreased rapidly and the inner friction increased significantly.

Finite Element Analysis of Z-Shaped Pipe in the Directly Buried Heat-Supply Pipeline with Large Diameter

2014 ◽  
Vol 721 ◽  
pp. 96-99
Author(s):  
Ming Qiang Li ◽  
Fei Wang ◽  
Guo Wei Wang ◽  
Yong Gang Lei
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Boundary Conditions ◽  
Engineering Design ◽  
Heat Supply ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Ansys Software ◽  
Element Analysis

In order to improve Z-shaped pipe in the directly buried heat-supply pipeline with large diameter stress calculations, guiding the engineering design when the short arm length is less than two times the elastic arms length. The author used ANSYS software to numerical simulation analysis on Z-shaped pipe in the directly buried heat-supply pipeline of DN800, DN1000, DN1200, when the long arm length of 50 m, 100 m, 150 m, and the short arm length from two times to one times of the elastic arm length. Applying boundary conditions in different models with the short arm length shortens the process to Z-shaped pipe of the elbow stress. For Z-shaped pipe in the directly buried heat-supply pipeline the short arm from two times to one times of the elastic arm length, the elbow’s stress value is the minimum when the short arm length is 1.2 times of the elastic arm length. This article breaks the specification limits on the short arm length, improving the flexibility of directly buried heat-supply pipeline with large diameter, reducing the difficulty of construction, and it’s important for guiding the actual project.

Numerical Simulation Analysis of the Ultimate Bearing Capacity of the Circular Steel Tube K-Joints Reinforced with the Concrete

2011 ◽  
Vol 94-96 ◽  
pp. 2118-2122
Author(s):  
Hong Bin Zhou ◽  
Qiao Zhen Zhang ◽  
Yun Liu ◽  
Jun Ying Dong
Keyword(s):  
Numerical Simulation ◽  
Bearing Capacity ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Engineering Application ◽  
Simulation Method ◽  
Steel Tube ◽  
Joint Zone ◽  
Deformation Curves ◽  
Circular Steel Tube

In order to solve the insufficient bearing capacity of the large-diameter circular steel tube K-Joints, the chord in the joint zone is filled with the concrete. The reinforcement of bearing capacity that the concrete makes to K-Joints is researched with the finite element numerical simulation method, in consideration of the material nonlinearity and the geometric nonlinearity. The numerical computation of bearing behavior is employed to eighteen groups of the large-diameter circular steel tube K-Joints and reinforced ones with the concrete (RK-Joints). The failure styles and the influencing factors of bearing capacity are analyzed with RK-Joints. The result shows that the bearing capacity of K-Joints is enhanced significantly by the concrete filled in the chord in the joint zone. The load-deformation curves reveal the changing regularity that the bearing capacity of joint follows the relevant parameters. It can provide reference for the engineering application of RK-Joints.

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