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Compaction coefficient of loess




Field study on the reinforcement of collapsible loess

The dynamic compaction DC method is an effective ground treatment technique that is widely used for a variety of soil types and conditions particularly in loess areas However DC is rarely applied to ground where thick collapsible loess is present The conventional DC method exerts an energy level of no more than 5000 kN m

The loess microstructure kinds and its seismic subsidence

The paper put forward a new method of loess microstructure analysis to determine whether the loess seismic subsidence deformation to be strong or weak In the dryer and colder climatic conditions of northwest of China the loess microstructure formed in certain conditions changed by the special climate and desert surroundings According to its chemical element ratio such as Si/Al

PDF Engineering properties of compacted loesses as

80 compaction of Indiana loess The samples 10 25 and 30 clay contents This method was used to calculate the coefficient of collapsibility of Guyuan loess and the results show that

PDF Experimental Study on the Saturated Compacted Loess

The fitting equation can estimate the saturated permeability coefficient of compacted loess at different depths The horizontal saturated permeability coefficient of compacted loess is larger than

THE EFFECT FO DENSITY ON SEISMIC SUBSIDENCE OF

stress a seismic subsidence coefficient it is a basis for the prediction of seismic subsidence amount of loess ground Fig 2 and 3 are the seismic subsidence curves of compacted loess respectively under the cyclic times of 10 and 30 Figure 2 The seismic subsidence of compacted loess under the cyclic times of 10 strain stress kPa 0 40

Field study on the reinforcement of collapsible loess

The dynamic compaction DC method is an effective ground treatment technique that is widely used for a variety of soil types and conditions particularly in loess areas However DC is rarely applied to ground where thick collapsible loess is present The conventional DC method exerts an energy level of no more than 5000 kN m

Dynamic Elastic Modulus and Damping Ratio of Lignin

The compaction coefficient of lignin modified loess specimens was determined as 0 95 The specimens were cured to 28 days under standard curing conditions 20 ± 2 C a relative humidity of 95 25 26 Fig 7 shows the molds and specimen used in the experiment Figure 7 Cylindrical mold and specimen used in this study

Disintegration characteristics of collapsible loess after

The vibratory probe compaction method is an effective way to eliminate collapsibility and improve the allowable stress for collapsible loess foundation it can also minimise the disintegration threat of loess in water to engineering construction

Field study on the treatment of collapsible loess using

The laboratory test showed that the collapsibility coefficient about 0 003 of loess samples at different treatment depths was greatly reduced after vibratory probe compaction and to a non collapsible state The void ratio decreased by 10 28 after compaction while the compression modulus and dry density increased

Influence of sand gradation on compaction of loess soils

1 Introduction Soil compaction is one of the major soil degradation processes worldwide Excessive soil compaction reduces air and water movement in the soil profile decreases nutrient availability for plants and limits the root growth of crops thereby affecting crop yields Hanza and Anderson 2005 Chamen et al 2015 Maximum bulk density BD MAX a parameter derived from

Deterioration characteristics of cement improved loess

The effects of cement dosage compaction coefficient molding method vertical vibration method and static pressure method and dry wet and freeze thaw cycles on the mechanical strength of cement improved loess CIL were studied to reveal its strength degradation law

Study of deformation characteristic of compacted loess

Based on one dimensional consolidation tests the deformation characteristic of compacted loess is analyzed troducing the concept of the compression deformation coefficient the relation between

Mechanical behavior and microstructural variation of loess

The laboratory dynamic compaction test was used to study the effects of dynamic impact loads on the shear strength characteristics of loess Loess specimens were compacted by different numbers of blows and their shear strengths measured The experimental results revealed that the shear strength varies in stages with the number of blows

The loess microstructure kinds and its seismic subsidence

loess formation conditions and to estimate seismic sub sidence in general This is also the loess clay element radios such as Si/Al Ca/Fe K/Al Ca/Mg and it should affect the strength of the loess as one of the basis of theoretical analysis It could produce a new method to defense the loess environmental hazards and reinforce ment

The loess microstructure kinds and its seismic subsidence

loess formation conditions and to estimate seismic sub sidence in general This is also the loess clay element radios such as Si/Al Ca/Fe K/Al Ca/Mg and it should affect the strength of the loess as one of the basis of theoretical analysis It could produce a new method to defense the loess environmental hazards and reinforce ment

Spike s Compaction Factor Calculator

Assume you are using dry gravel with a swell percentage of 15 and a shrink percentage of 7 Plug those values into the calculator and it will tell you that the compaction factor = 1 237 Multiply the 1185 cubic yards by 1 237 1185 1 237 = 1465 9 To complete this job you will need 1465 9 cubic yards of this gravel in loose state volume

A measuring method for layered compactness of loess

Loess is extensively distributed all over the world accounting for approximately 10 of the global land area The Loess Plateau in Northwest China is the most densely distributed loess area in the country representing 72 4 of China s total loess area Loess has the characteristics of looseness and collapsibility so it is necessary to strictly control the quality of loess subgrade 2–4

Field study on the treatment of collapsible loess using

The laboratory test showed that the collapsibility coefficient about 0 003 of loess samples at different treatment depths was greatly reduced after vibratory probe compaction and to a non collapsible state The void ratio decreased by 10 28 after compaction while the compression modulus and dry density increased

The Compaction Method of Backfill Site with Loess and the

To the question of reclaimed land of low hills gentle slope and gully of Lanzhou City including the compaction way of backfill site with loess and physical parameters of test the paper discusses the main factors affecting the soil compaction and put forward suitable compaction method of backfill site with loess By analysing a large number of soil physical parameters experimental data the

Research on the collapsibility of loess after water

Figure 25 demonstrates that the self weight collapsibility coefficient and collapsibility coefficient of loess decrease with increasing dry density The new loess exhibit a wide range of dry density values which range from 1 1 to 1 5 The dry density value of Paleosol is

On the phase portraits of degradation of soil subsidence

ABSTRACT The compaction coefficient of loess is a nonlinear function which is coupling the porosity coefficient and two parameters pressure and humidity The compaction coefficient is the main characteristic of the subsidence soil A scatter diagram constructed in coordinates the coefficient of porosity the difference

Experimental Study on the Permeability of Compacted Loess

The phenomenon is induced by a decrease in cumulative volume or void ratio which is verified by the results of mercury intrusion porosimetry and scanning electron microscopy images A new mathematical model is proposed for predicting the value of k in compacted loess soils expressed as a function of water content and void ratio

Deterioration characteristics of cement improved loess

The effects of cement dosage compaction coefficient molding method vertical vibration method and static pressure method and dry wet and freeze

Compression Tests on Remodeling Lishi Loess

content degree of compaction and compression deformation coefficient compression factor of compacted loess studied compacted loess loading constitutive model and increase decrease wet constitutive model Zeng Lingling 5 conducted GDS triaxial compression test under different stress paths for natural sedimentary

Study on Reasonable Feature of Compaction Loess with Air

The degree of compaction is usually used as the compaction quality and control indicator of backfill in practical project However as the degree of compaction is affected by various internal and external factors its accuracy is difficult to guarantee In this paper compacted loess samples were prepared under different compaction energies by normal compaction method

Compaction Quality of Loess Subgrade Based on

The coefficient of collision recovery e can be expressed as ev v v v 2 Equations 1 and 2 can then be combined to obtain vv m ev v mm 3 By comparing the dynamic compaction method the hydraulic compaction method can accelerate the fall of the rammer during the reinforcement of loess subgrade under the combined

Field study on the treatment of collapsible loess using

The compaction effect in terms of collapsibility coefficient and density at 1 2 m spacing was more pronounced than at 1 4 m spacing The vibratory probe compaction method was successful for the treatment of collapsible loess

Compaction Quality of Loess Subgrade Based on

The coefficient of collision recovery e can be expressed as ev v v v 2 Equations 1 and 2 can then be combined to obtain vv m ev v mm 3 By comparing the dynamic compaction method the hydraulic compaction method can accelerate the fall of the rammer during the reinforcement of loess subgrade under the combined

Disintegration characteristics of collapsible loess after

The vibratory probe compaction method is an effective way to eliminate collapsibility and improve the allowable stress for collapsible loess foundation it can also minimise the disintegration threat of loess in water to engineering construction

Experimental Study on the Saturated Compacted Loess

The fitting equation can estimate the saturated permeability coefficient of compacted loess at different depths The horizontal saturated permeability coefficient of compacted loess is larger than that in the vertical direction showing obvious anisotropy The saturated permeability anisotropy ratio is linearly related to the initial dry density

Mechanical behavior and microstructural variation of loess

The laboratory dynamic compaction test was used to study the effects of dynamic impact loads on the shear strength characteristics of loess Loess specimens were compacted by different numbers of blows and their shear strengths measured The experimental results revealed that the shear strength varies in stages with the number of blows

Experimental Study on the Permeability of Compacted

In the western regions of China loess soils are widely used as fill materials in the construction of highways and building foundations The hydraulic conductivity of this fill material is a significant parameter for initial engineering designs but currently there are a very limited number of investigations into this aspect In this study a series of tests on compacted loess soils was

Influence of sand gradation on compaction of loess soils

1 Introduction Soil compaction is one of the major soil degradation processes worldwide Excessive soil compaction reduces air and water movement in the soil profile decreases nutrient availability for plants and limits the root growth of crops thereby affecting crop yields Hanza and Anderson 2005 Chamen et al 2015 Maximum bulk density BD MAX a parameter derived from

PDF Real Time Monitoring Method for Layered

coefficient can be found in Table 3 thus the re al time layered compaction shown in Table 4 was obtained To verify the accuracy of the calculated layered compactness the

Influence of sand gradation on compaction of loess soils

1 Introduction Soil compaction is one of the major soil degradation processes worldwide Excessive soil compaction reduces air and water movement in the soil profile decreases nutrient availability for plants and limits the root growth of crops thereby affecting crop yields Hanza and Anderson 2005 Chamen et al 2015 Maximum bulk density BD MAX a parameter derived from

Applied Mechanics and Materials Vol 238 p 10

In this paper compacted loess samples were prepared under different compaction energies by normal compaction method The curves of compression coefficient and dry density the compression coefficient and porosity of compaction loess samples under different compaction energy are analyzed while the water content is constant