Research on FLAC 3D Numerical Simulation of Working Mechanism of Compaction Pile Composite Foundation

2012 ◽  
Vol 204-208 ◽  
pp. 220-223
Author(s):  
Yong Qiang He ◽  
Hui Qing Zhang ◽  
Bin Can Liu ◽  
Yun Wu
Keyword(s):  
Soil Compaction ◽  
Composite Foundation ◽  
Working Mechanism ◽  
3D Numerical Simulation ◽  
Loess Area ◽  
Foundation Treatment ◽  
Collapsible Loess ◽  
Expansion Theory ◽  
Flac 3D ◽  
Cavity Expansion Theory

Compaction piles is one of the conventional methods for foundation treatment in collapsible loess, there are very few research results about soil compaction effect between piles when forming the piles. Firstly, the stress field and displacement field of soil around compaction piles are elastic-plastic analyzed on the basis of the cavity expansion theory; then a series of FLAC 3D numerical simulations were performed to evaluate the treatment effect of the compaction pile composite foundation. The result shows that all bearing capacity has improved, and quicklime compaction pile composite foundation has been increased remarkably. It embodies the correctness of the computation theory. And the feasibility of the compaction piles composite foundation on collapsible loess area is further proved.

Application Research of Compaction Pile in Heavy Collapsible Loess

2011 ◽  
Vol 90-93 ◽  
pp. 1390-1393 ◽  
Author(s):  
Yong Qiang He ◽  
Yan Peng Zhu ◽  
Yun Wu ◽  
Xiao Qing Wang
Keyword(s):  
Soil Compaction ◽  
Composite Foundation ◽  
Application Research ◽  
Loess Area ◽  
Foundation Treatment ◽  
Collapsible Loess ◽  
Expansion Theory ◽  
Soil Compressibility ◽  
Cavity Expansion Theory ◽  
Physical Mechanics

Compaction piles is one of the conventional methods for foundation treatment in collapsible loess, there are very few research results about soil compaction effect between piles when forming the piles. Firstly, the stress field and displacement field of soil around compaction piles are elastic-plastic analyzed on the basis of the cavity expansion theory; then a series of field and laboratory tests were performed to evaluate the treatment effect of the compaction pile composite foundation. The result shows that the collapsibility has been eliminated, all physical mechanics indexes have been improved, and soil compressibility and modulus of compressibility are also increased remarkably. It embodies the correctness of the computation theory. And the feasibility of the compaction piles composite foundation on collapsible loess area is further proved.

Application of Lime-Soil Compaction Pile Method for Loess Foundation Treatment

2014 ◽  
Vol 638-640 ◽  
pp. 393-396 ◽  
Author(s):  
Fei Huang ◽  
Da Jun Zhao
Keyword(s):  
Soil Compaction ◽  
Construction Projects ◽  
Engineering Practice ◽  
Treatment Methods ◽  
Foundation Treatment ◽  
Collapsible Loess ◽  
Characteristics Analysis

Construction projects are increasingly encountered bad foundation, because of collapsible loess is widely distributed in our country, so most widely especially bad in collapsible loess foundation, this paper based on the characteristics analysis of the loess collapsibility of loess, expounded in combination with the engineering practice of collapsible loess foundation treatment methods, problems and countermeasures.

Analysis of Bearing Capacity for Quicklime Compaction Pile Composite Foundation

2013 ◽  
Vol 671-674 ◽  
pp. 10-13 ◽  
Author(s):  
Yong Qiang He ◽  
Bin Can Liu ◽  
Bao Ping Jiao ◽  
Ji Zhong Gan
Keyword(s):  
Bearing Capacity ◽  
Influencing Factors ◽  
Calculation Method ◽  
Soil Compaction ◽  
Composite Foundation ◽  
Reliability Design ◽  
Collapsible Loess ◽  
Practical Engineering

In the collapsible loess of Midwest China, quicklime compaction pile composite foundation has been widely used in practical engineering. Firstly，the calculation method of quicklime compaction pile composite foundation is analyzed; then the influencing factors of bearing capacity for quicklime compaction pile composite foundation was researched on the basis of the character about soil compaction effect between piles with the quicklime expanding when absorbing water from the soil; lastly, the calculation method was used in practical engineering, the results can be used to reference in reliability design application of composite foundation.

scholarly journals Study on Foundation Treatment Technology of Comprehensive Pipe Gallery in Collapsible Loess Area

2020 ◽  
Vol 560 ◽  
pp. 012046
Author(s):  
Liangcheng Li ◽  
Qi Liu ◽  
Jianxun Ma ◽  
Rubin Jia ◽  
Wenyan Zhou ◽  
...  
Keyword(s):  
Treatment Technology ◽  
Loess Area ◽  
Foundation Treatment ◽  
Collapsible Loess

Study on the Treatment Effect on the Loess Layer of Culvert Basement on Central-South Railway DK241+860 Section

2014 ◽  
Vol 618 ◽  
pp. 533-537
Author(s):  
Ai Feng ◽  
Yan Zhao ◽  
Qi Fang Zhan ◽  
Ya Hui Jia ◽  
Ai Jun Zhu
Keyword(s):  
Treatment Effect ◽  
Soil Compaction ◽  
Construction Method ◽  
Engineering Properties ◽  
Foundation Treatment ◽  
Collapsible Loess ◽  
Cement Soil ◽  
Central South

As an example of collapsible loess foundation treatment project in central and southern shanxi tunnels five railway culvert, the collapsible loess and harm of engineering properties, this paper introduces the construction method by cement-soil compaction pile to reinforce the foundation in order to ensure the quality and effect of the overloaded railway foundation.

The Selection of the Collapsible Loess Foundation Treatment Methods

2012 ◽  
Vol 170-173 ◽  
pp. 331-334
Author(s):  
Yun Bo Xu ◽  
Yan Fei Sun
Keyword(s):  
Soft Soil ◽  
Composite Foundation ◽  
Treatment Methods ◽  
Advantages And Disadvantages ◽  
Ground Treatment ◽  
Foundation Treatment ◽  
Collapsible Loess ◽  
Key Issues ◽  
Foundation Pile ◽  
Selection Of

The collapsible loess ground treatment methods include dynamic compaction, soil replacement cushion method, lime-soil compaction pile composite foundation, pile foundation, etc. Each method has its advantages and disadvantages. The bearing capacity of collapsible loess is not lower, it is non-soft soil. The purpose of the collapsible loess ground treatment is to eliminate the collapsible at the most, few to increase the capacity and improve the heterogeneity of the foundation. In this paper, the collapsible loess foundation treatment methods are been compacted from the technical and economic factors. And the key issues of the collapsible loess ground treatment methods are discussed.

Study on the Treatment and Settlement Monitoring Technology of Passenger Dedicated Line Collapsible Loess Foundation

2014 ◽  
Vol 584-586 ◽  
pp. 1951-1955
Author(s):  
Fu Chun Liu ◽  
Hui Feng Su ◽  
Qiu Chun Wang
Keyword(s):  
Loess Area ◽  
Transition Section ◽  
Railway Line ◽  
Foundation Treatment ◽  
Collapsible Loess ◽  
Hyperbolic Curve ◽  
Long Time ◽  
Line Passing ◽  
Settlement Monitoring

By the engineering background of Datong-Xian Passenger Dedicated Railway Line passing through the collapsible loess area, four representative test sections such as roadbed-bridge transition section, roadbed-culvert transition section, ordinary and special embankment section was selected. Different pile parameter and pile plane layout and subgrade filling measure has been taken according to the different test sections. At the same time, the correspondence of settlement monitoring project was carried out. After the long time monitoring, by the hyperbolic curve and logarithmic method predicting, the long-term settlement has been predicted. The monitoring results and the curve fitting shows that the settlement and the foundation treatment schemes with subgrade filling measurement meet the design requirement also provided reference and reference for other engineering.

scholarly journals Study on the Hydro-Thermal-Mechanical Characteristics of the Lime-Soil Compaction Pile in the Forming Process

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Fengchuan Zhang ◽  
Jianhua Dong ◽  
Xiaoyu Yang ◽  
Bo Lian ◽  
Xuelang Wang
Keyword(s):  
Soil Compaction ◽  
Pressure Change ◽  
Soil Pressure ◽  
Expansion Process ◽  
Forming Process ◽  
Collapsible Loess ◽  
Influence Of Water ◽  
Force Characteristics ◽  
Temperature Water ◽  
Pore Expansion

To study the effect of the lime-soil compaction pile on the collapsible loess foundation and the influence of water-heat-force characteristics on the soil during compaction, the field test of lime-soil compaction pile treatment of collapsible loess foundation is carried out. This paper monitors the process of soil temperature, water, and soil pressure change in the process of pile forming. According to the macroprocess and micromechanism of lime-soil compaction pile treatment of collapsible loess foundation, the qualitative law of water-heat-force change in the process of pile forming is obtained. Meanwhile, the influence of soil damage is introduced in the process of compaction expansion. The model of pore expansion under linear damage conditions in the plastic zone is established. The formula of radial stress distribution under damage conditions is given. The influence of different damage factors on the expansion process is analyzed.

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