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.

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.

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.

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.

The Permeability of Three Kinds of Improved Soil in Northwest Area and its Application in Foundation Treatment

2014 ◽  
Vol 884-885 ◽  
pp. 716-719 ◽  
Author(s):  
Wan Fu Liu ◽  
Ze Ping Yang
Keyword(s):  
Fly Ash ◽  
Calcareous Soil ◽  
Control Material ◽  
Seepage Control ◽  
Foundation Treatment ◽  
Coefficient Of Permeability ◽  
Cement Soil ◽  
Modified Soil

Study on the permeability of three kinds of soil research, including in loess, calcareous-soil, lime and fly ash (two ash) of loess, cement-soil. Selects 10 groups of soil to determine the coefficient of permeability.The results show that: cement-soil of 3:7 can be used as impervious material than calcareous-soil of 3:7. Calcareous-soil of 3:7 can be used as seepage control material in short-term.Two-ash can not play this role; As the same time, we found that: The coefficient of permeability of all kinds of modified soil are increasing after 21 days.

The Technology Innovation of Green Soft Ground Handling Based on Squeezing and Consolidation Composited

2014 ◽  
Vol 580-583 ◽  
pp. 2244-2248
Author(s):  
Jun Yi Shao ◽  
Xiao Zhang
Keyword(s):  
Life Cycle ◽  
Carrying Capacity ◽  
Soil Compaction ◽  
Environmental Load ◽  
Treatment Technology ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Ground Handling ◽  
Pump Pressure ◽  
The Cost

In this paper, we sorted soft foundation treatment technology by quantifying based on evaluation technique of life cycle environmental load and choose cement mixing pile which life-cycle environmental load is small and spiral pump pressure CFG pile which carrying capacity is high to integrate. It not only improved soil compaction effects, but also solved the problems of other technologies in the foundation process, such as low carrying capacity, reduced diameter, broken pile, virtual pile and so on. Besides, it has reduced the cost of the project and the application prospects are broad.

Traction-Soil Compaction Tradeoffs as a Function of Dynamic Soil-Tire Interation Due to Varying Soil and Loading Conditions

1995 ◽  
Author(s):  
Shrini Upadhyaya ◽  
Dan Wolf ◽  
William J. Chancellor ◽  
Itzhak Shmulevich ◽  
Amos Hadas
Keyword(s):  
Prediction Model ◽  
Soil Compaction ◽  
Field Tests ◽  
Prediction Equation ◽  
Engineering Properties ◽  
Solution Technique ◽  
Strain Rate Effects ◽  
Disturbed Soil ◽  
Properties Of Soil

The objectives of this study were to investigate soil-pneumatic tire interaction and develop traction-soil compaction prediction model. We have developed an inverse solution technique that employs a response surface methodology to determine engineering properties of soil in-situ. This technique is useful in obtaining actual properties of soil in-situ for use in traction and soil compaction studies rather than using the values obtained in the laboratory by employing remolded and/or disturbed soil samples. We have conducted extensive field tests i the U.S. to develop semi-empirical traction prediction equation for radial ply tires. A user friendly traction-soil compaction program was developed to predict tractive ability of radial ply tires using several different techniques and to estimate soil compaction induced by these tires. A traction prediction model that incorporates strain rate effects on the tractive ability of tires was developed in Israel. A mobile single wheel tester and an in-situ soil test device were developed i Israel to significantly enhance the ability of Israeli investigators to conduct traction-soil compaction research. This project has resulted in close cooperation between UCD, Technion, and ARO, which will be instrumental in future collaboration.

Test Research on Influence of Water and Mineral Composition on Physical and Mechanical Properties of Phyllite

2014 ◽  
Vol 496-500 ◽  
pp. 2398-2401 ◽  
Author(s):  
Xin Zhe Li ◽  
Geng Feng Wang ◽  
Ling Cao
Keyword(s):  
Mechanical Properties ◽  
Mineral Composition ◽  
Physical And Mechanical Properties ◽  
Construction Method ◽  
Engineering Properties ◽  
Tunnel Construction ◽  
Regular Pattern ◽  
Initial Stress State ◽  
Influence Of Water ◽  
Relative Factors

As a regional metamorphic rock, the engineering properties of the phyllite are rather complex. It is common that the tunnel construction safety has tremendous difficulty due to the groundwater, the initial stress state, joints, cracks and faults and other factors, so it is necessary to find an effective construction method for the construction of phyllite tunnel. To master the regular pattern of the influence of relative factors on physical and mechanical properties of phyllite is the basis to establish an effective construction method. The paper tries to analyze the influence of water and mineral composition on physical and mechanical properties of phyllite by making relevant tests on Lu Lin tunnel, and hope to give some clue to the design and construction of phyllite tunnels.

scholarly journals Investigation of the Application of Various Water Additive Ratios on Unconfined Compressive Strength of Cement-Stabilized Amorphous Peat at Different Natural Moisture Contents

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Atikah Rahmi ◽  
Siti Noor Linda Taib ◽  
Fauzan Sahdi
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Peat Soil ◽  
Soil Improvement ◽  
Engineering Properties ◽  
Soil Reaction ◽  
Moisture Contents ◽  
Ucs Test ◽  
Cement Soil

Natural peat is considered incapable of supporting built structure due to its poor engineering properties. Chemical stabilization is one of the peat soil improvement methods which has been studied by many researchers. This study describes an investigation of water additive (W/A) ratio application on cement-stabilized peat strength. Peat soil at different moisture contents, which are 1210%, 803%, and 380%, were stabilized with cement by W/A ratio of 2.0, 2.5, 3.0, 3.5, and 4.0. Unconfined compressive strength (UCS) test was conducted after the specimens were being air-cured for 28 and 56 days. The result shows that there is an increase of UCS value as the decrease of W/A ratio (the increase of cement dosage) and the increase of curing time and peat moisture content. The higher strength found in the specimen with higher moisture content, compared to the lower one at the same W/A ratio, shows that the mix design of cement-stabilized peat using W/A ratio should have differed under different peat natural moisture contents. From the result, it is also found that cement hydrolysis reaction occurred despite the presence of humic acid in the peat soil, which by many studies is assumed will hinder the cement-soil reaction.

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