Compaction coefficient of loess

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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.

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(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

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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

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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.

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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.

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The effect of compaction of a loess soil on oxygen

The effects of the compaction of a brown loess soil on its aeration properties (measured with the oxygen diffusion rate and the relative coefficient of diffusion) and on soil strength were investigated. The main factor limiting plant growth for moisture contents where water was easily available to plants was soil strength the critical density being 1.35 Mg/m3.

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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.

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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

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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

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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

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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

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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.

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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

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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

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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

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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

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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.

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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

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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.

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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.

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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

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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

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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

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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.

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Permeability characteristic of fly ash added by loess.

When coefficient of compaction was 98 and 85 the permeability coefficient of fly ash reduced to 23.8 of the original while at 93 it was 14.5 of the original. Conclusion The maximum dry density increased while the permeability weakened after adding loess into fly ash.

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(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

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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

Click to chat

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.

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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.

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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.

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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.

Click to chat

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

Click to chat

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.

Click to chat

(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

Click to chat

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.

Click to chat

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.

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