Practical Method for the Pile Composite Ground under Flexible Foundation Based on Super-Substructure Interaction

2011 ◽  
Vol 250-253 ◽  
pp. 2575-2582
Author(s):  
Yong Fei Peng ◽  
Jian Lin Yu ◽  
Xiao Nan Gong ◽  
Wen Zhi Lv
Keyword(s):  
Analytical Model ◽  
Stress Ratio ◽  
Practical Method ◽  
Interactive System ◽  
Relative Movement ◽  
Foundation Soil ◽  
Composite Ground ◽  
Water Conservancy ◽  
Stress And Deformation ◽  
Flexible Foundation

The technology of the composite ground under a flexible foundation have been widely used in transportation, water conservancy and other departments, yet its theory of characterizing the behavior of the composite ground needs to be further researched. A simplified analytical model is presented, considering the above four parts which includes the flexible foundation, the cushion, the composite ground, and the underlying soils as an interactive system, allowing for the relative movement between piles and soils, and assuming different settlement of foundation soil at the same elevation. The force equilibriums of a typical element are established. And then, according to the compatibility of stress and deformation on the interfaces between these four components, the formulas on settlement and stress ratio of pile-soil, which is used to characterize the behavior of the composite ground, are derived.

Study and Analysis on Pile-Soil Stress Ratio of the Composite Foundation of Cement-Soil Mixing Pile under Flexible Foundation

2011 ◽  
Vol 335-336 ◽  
pp. 1145-1150
Author(s):  
Xiao Rong Yang ◽  
Lei Yu Zhang ◽  
Hai Chao Li ◽  
Li Ying Dong
Keyword(s):  
Stress Ratio ◽  
Soft Soil ◽  
Composite Foundation ◽  
Soil Mixing ◽  
Soil Stress ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Flexible Foundation ◽  
Cement Soil ◽  
Friction Pile

In order to analyze the characteristics of pile-soil stress ratio of the composite foundation of cement-soil mixing pile under flexible foundation, this paper points out the displacement mode of friction pile; According to the deformation characteristic of friction pile, ascertain the neutral point of composite foundation. And this paper also derives the exact formula about length-stress ratio which addresses the problem of soft soil foundation according to the deformation co-ordination conditions of the pile composite foundation. The calculation of actual example proves that the formula about pile-soil stress ratio is in accordance with actual measurement number. The pile-soil stress ratio which addresses the problem of soft soil foundation is generally between 2~4. If other conditions keep invariable, pile-soil stress ratio become big when cushion modulus become big. Cushion modulus effect the length-stress ratio greatly.

Simulation of Solid Cargo-Vehicle Interaction During Braking of a Heavy Vehicle With ABS

2005 ◽  
Author(s):  
Jose´ A. Romero ◽  
Subhash Rakheja ◽  
Alejandro Lozano
Keyword(s):  
Analytical Model ◽  
Total Mass ◽  
Heavy Vehicle ◽  
Relative Movement ◽  
Vehicle Performance ◽  
The Road ◽  
Stopping Distance ◽  
Vehicle System ◽  
Important Phenomenon ◽  
Road Roughness

The effect of cargo shifting on the braking efficiency of a freight truck is investigated thorough development and analysis of an analytical model of the cargo-vehicle system together with the tie-down system. Braking efficiency is characterized in terms of the stopping distance, as a function of the cargo securement method (direct and indirect) and deck vibration caused by varying levels of road roughness. The relative movement of the cargo with respect to the deck causes decoupling of the cargo and the vehicle masses. The effective braking forces are thus applied to a reduced total mass. An important phenomenon that influences the cargo-vehicle interaction derives from the decoupling of the cargo and vehicle masses during the shifting of the cargo, leading to a situation in which the braking forces are applied to a reduced mass. The vehicle performance with a rigidly fixed cargo is also evaluated for comparison purposes. Results show that the indirectly restrained cargo produces the minimum stopping distances, irrespective of the road roughness, while the maximum stopping distances are attained for the directly restrained cargo.

Analysis for Engineering Example of Dry Jet Mixing Pile Consolidating Foundation

2012 ◽  
Vol 256-259 ◽  
pp. 120-124
Author(s):  
Shu Lian Wen ◽  
Qing Hong Zhang
Keyword(s):  
Data Analysis ◽  
Intertidal Zone ◽  
Soft Soil ◽  
Compressive Modulus ◽  
General Technique ◽  
Foundation Soil ◽  
Jet Mixing ◽  
Foundation Treatment ◽  
Composite Ground ◽  
Dry Jet Mixing Pile

Dry jet mixing pile is the general technique of composite ground consolidation , which is used in foundation treatment of soft soil under highway. It has a widespread applying due to so many advantages. This passage adopts an example of dry jet mixing pile combined with Longkou Shugang expressway engineering, it aims to state that dry jet mixing pile consolidating foundation along intertidal zone would obviously improve bearing capacity, strength and compressive modulus of foundation soil, reduce settlement and make a difference of consolidating foundation in according to data analysis of field or laboratory experiment. This technique is an effective way to solve the Jump Car problem and economic and quick.

2D Finite Element Analysis of a Excavation Supporting Types in Changchun City

2014 ◽  
Vol 536-537 ◽  
pp. 1589-1593 ◽  
Author(s):  
Xiu Xiu Liu ◽  
Guang Li Sun ◽  
Chao Sun
Keyword(s):  
Finite Element ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Element Analysis ◽  
Foundation Soil ◽  
Finite Element Software ◽  
Excavation Process ◽  
Excavation Work ◽  
Deep Foundation Excavation ◽  
Stress And Deformation

In this paper, By using a large common ABAQUS finite element software to simulate a hospital,s deep foundation pit excavation process in Changchun, Contrasting respectively pile-anchor retaining structure which had been adopted in the project with pile-strut bracing structure. Obtaining stress and deformation of soil and the stress and deformation of pile under the two supporting types, Analysis of the two supporting types feature only from the perspective of the force and deformation in foundation soil and piles, To provide a reference for future support in deep foundation excavation work.

Study on Bearing Mechanism of Long-Short-Pile Composite Foundation under Rigid Foundation

2014 ◽  
Vol 638-640 ◽  
pp. 570-573
Author(s):  
Shuang Bin Qian ◽  
Li Hua Zhang
Keyword(s):  
Load Distribution ◽  
Stress Ratio ◽  
Ground Improvement ◽  
Composite Foundation ◽  
Rigid Foundation ◽  
Foundation Soil ◽  
Negative Skin Friction ◽  
Friction Resistance ◽  
Composite Pile ◽  
Side Friction

Long-short composite pile is a widely used ground improvement technique. This study presents the results of finite difference analyzes using FLAC3D software to investigate the load-bearing and bearing mechanism of long-short pile composite foundation under rigid foundation. The pile-soil load-sharing ratio and stress ratio, axial force distribution in the piles, and pile side friction resistance distribution characteristics are also studied. The results showed that due to negative skin friction of pile in composite foundation soil functions are fully utilized. On the other hand, the load distribution between piles and subsoil is significantly affected by the cushion.

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