Research on the Dynamic Characteristics of Clay

2014 ◽  
Vol 535 ◽  
pp. 764-767
Author(s):  
Qian Feng ◽  
Heng Li ◽  
Yi Zhang
Keyword(s):  
Triaxial Test ◽  
Damping Ratio ◽  
Dynamic Strain ◽  
Soil Parameters ◽  
Dynamic Shear Modulus ◽  
Resonant Column ◽  
Column Test ◽  
Dynamic Triaxial Test ◽  
Response Characteristics ◽  
Resonant Column Test

In order to obtain the dynamic response characteristics of soil parameters, dynamic triaxial test is a commonly used method, but the project generally use the resonant column test instead. We selected a typical clay in Wuhan were carried out dynamic triaxial and resonant column test, get the relationship of the dynamic shear modulus ratio and dynamic strain under different dynamic stress and dynamic relationship with the dynamic strain damping ratio, respectively. Comparative analysis showed that the resonant column test obtained smaller results than the dynamic triaxial test.

Shear moduli and damping in frozen and unfrozen clay by resonant column tests

1996 ◽  
Vol 33 (3) ◽  
pp. 510-514 ◽  
Author(s):  
M O Al-Hunaidi ◽  
P A Chen ◽  
J H Rainer ◽  
M Tremblay
Keyword(s):  
Shear Modulus ◽  
Damping Ratio ◽  
Frozen Soil ◽  
Test Method ◽  
Dynamic Shear Modulus ◽  
Resonant Column ◽  
Dynamic Shear ◽  
Column Test ◽  
Shear Moduli ◽  
Resonant Column Test

The resonant-column test method was used in this study to determine the dynamic shear moduli and damping ratios of frozen and unfrozen soil samples. Naturally frozen soil specimens were obtained in-situ during the winter. A series of tests were carried out on the frozen soil specimens in a cold room at –9°C. The same specimens, after allowing them to thaw, were then tested at room temperature. Test results show that at low-amplitude shear stains the damping ratio of frozen soil specimens is roughly twice that of unfrozen samples. In addition, the dynamic shear modulus for soil specimens while frozen is significantly greater (30 or 50 times) than that of unfrozen specimens. These results provide a basis for explaining an observation that bus-induced vibrations in buildings while the top soil is frozen in winter are about one-half those induced while the soil is not frozen. Key words: resonant-column test, shear modulus, damping ratio, frozen soil, ground vibration.

scholarly journals Evaluation of Dynamic Properties of Sodium-Alginate-Reinforced Soil Using A Resonant-Column Test

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2743
Author(s):  
Seongnoh Ahn ◽  
Jae-Eun Ryou ◽  
Kwangkuk Ahn ◽  
Changho Lee ◽  
Jun-Dae Lee ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Sodium Alginate ◽  
Shear Failure ◽  
Dynamic Properties ◽  
Damping Ratio ◽  
Reinforced Soil ◽  
Resonant Column ◽  
Column Test ◽  
Alginate Solution ◽  
Resonant Column Test

Ground reinforcement is a method used to reduce the damage caused by earthquakes. Usually, cement-based reinforcement methods are used because they are inexpensive and show excellent performance. Recently, however, reinforcement methods using eco-friendly materials have been proposed due to environmental issues. In this study, the cement reinforcement method and the biopolymer reinforcement method using sodium alginate were compared. The dynamic properties of the reinforced ground, including shear modulus and damping ratio, were measured through a resonant-column test. Also, the viscosity of sodium alginate solution, which is a non-Newtonian fluid, was also explored and found to increase with concentration. The maximum shear modulus and minimum damping ratio increased, and the linear range of the shear modulus curve decreased, when cement and sodium alginate solution were mixed. Addition of biopolymer showed similar reinforcing effect in a lesser amount of additive compared to the cement-reinforced ground, but the effect decreased above a certain viscosity because the biopolymer solution was not homogeneously distributed. This was examined through a shear-failure-mode test.

Dynamic moduli and damping ratios for cemented sands at low strains

1988 ◽  
Vol 25 (2) ◽  
pp. 353-368 ◽  
Author(s):  
Surendra K. Saxena ◽  
Anestis S. Avramidis ◽  
Krishna R. Reddy
Keyword(s):  
Confining Pressure ◽  
Dynamic Shear Modulus ◽  
Resonant Column ◽  
Dynamic Shear ◽  
Column Test ◽  
Dynamic Moduli ◽  
Cemented Sand ◽  
Beneficial Effects ◽  
Resonant Column Test ◽  
System Of Units

This paper advances the present understanding of the beneficial effects of cementation of sands on their dynamic behavior at low strain amplitudes. The influence of important parameters such as cement content, effective confining pressure, density, and curing period is discussed in detail on the basis of extensive resonant column test results. A newly proposed relationship for maximum dynamic shear modulus is compared with reported relationships. Empirical relations for maximum dynamic Young's modulus, dynamic shear damping, and dynamic longitudinal damping are developed for the first time. All the relations developed are nondimensional and adaptable to any system of units. Correlations between dynamic moduli and static strength from triaxial (drained) tests are developed for an effective confining pressure equal to 49 kPa. Key words: resonant column test, cemented sand, dynamic moduli, dynamic damping.

Reliability of GDS-RCA Resonant Column on Routine Experimentation

2013 ◽  
Vol 477-478 ◽  
pp. 439-442
Author(s):  
Xiao Fei Li ◽  
Rui Sun
Keyword(s):  
Shear Modulus ◽  
Damping Ratio ◽  
Testing Machine ◽  
Test Method ◽  
Response Analysis ◽  
Resonant Column ◽  
Test Results ◽  
Column Test ◽  
Torsional Mode ◽  
Resonant Column Test

The shear modulus and damping ratio of soil are important factors for soil layer seismic response analysis, people have done a lot of research. Currently, the method to measure soil shear modulus and damping ratio have bending element test method, resonant column test, dynamic triaxial test and so on. This article describes the British GDS company developed a new resonant column GDS-RCA's main features, technical indicators and working principle, compared the IEM original GZ-1 resonant column test results with GDS-RCA resonant column test results, the compared results are as follows: both damping ratio results in somewhat different, but in 10-6-10-4 low strain shear modulus ratio between the range of test results are consistent, GDS-RCA resonant column testing machine can by low-frequency torsional mode, expand the soil strain measurement extended to 10-6-10-2, and the small strain to large strain test results are in good connection.

scholarly journals Dynamic Triaxial Test and Microscopic Study of Solidified Muddy Soil With Different Mixing Ratios and Curing Ages

2021 ◽  
Vol 8 ◽  
Author(s):  
Zhou Chen ◽  
Haocheng Xu ◽  
Mayao Cheng ◽  
Hanwen Lu ◽  
Zhijian Wang ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Triaxial Test ◽  
High Speed ◽  
Dynamic Strength ◽  
Dynamic Strain ◽  
Hydration Reaction ◽  
Curing Agent ◽  
Mixture Ratio ◽  
Dynamic Triaxial Test ◽  
Curing Age

Aiming to explore the optimal mixture ratio and curing age of solidified muddy soil under dynamic load, the paper intends to investigate whether the solidified muddy soil can be used as filling of high-speed railway subgrade. Based on the dynamic triaxial test, the investigation measured the dynamic strain and dynamic elastic modulus of solidified muddy soil under different mix ratios and curing ages, and also observed the microscopic morphology of solidified muddy soil samples by using scanning electron microscope. The results show that the addition of cement and curing agent significantly increases the dynamic strength and elastic modulus of muddy soil, which effectively improve the dynamic characteristics of muddy soil. The curing effect of the curing agent is more obvious with the increase of the dosage of cement and curing agent under different mix ratio. The content of curing agent plays a leading role in the hydration reaction between cement, curing agent and soil particles. Additionally, in case of the same test conditions, when the ratio of cement mass to dry silt mass is 1:20, the ratio of diluent volume to dry silt mass is 1:20, with 28 days of curing age, its curing effect will reach the best.

Evaluation of Resonant Column Test Devices

1976 ◽  
Vol 102 (11) ◽  
pp. 1147-1158
Author(s):  
George R. Skoglund ◽  
Robert W. Cunny ◽  
William F. Marcuson
Keyword(s):  
Resonant Column ◽  
Column Test ◽  
Resonant Column Test

scholarly journals Identification on rock and soil parameters for vibro-cutting rock by disc cutter based on fuzzy radial basis function neural network

2018 ◽  
Vol 175 ◽  
pp. 03073
Author(s):  
Qiang Chen ◽  
Jianke Lang
Keyword(s):  
Neural Network ◽  
Radial Basis Function ◽  
Basis Function ◽  
Disc Cutter ◽  
Resonant Column ◽  
Column Test ◽  
Soil Parameter ◽  
Resonant Column Test ◽  
Radial Basis ◽  
Rock And Soil

A single-POF model of disc cutter with rock and soil has been established according to the dynamical feature and vibration mechanism of disc cutter vibro-cutting rock to solve problem of self-adaption vibro-cutting rock for disc cutter, and identification on rock and soil parameter of disc cutter vibro-cutting rock has been carried out by using fuzzy radial basis function neural network. The experimental result of identification simulation and resonant-column test showed that compared to inherent frequency of a hard sandy which was tested by resonant-column test method, the relevant error of rock and soil parameter identification value of disc cutter vibro-cutting rock is 0.87 %, with high estimation accuracy.

scholarly journals Study on Dynamic Characteristics of Rubber-Red Clay Mixtures

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Kaisheng Chen ◽  
Qinqin Wang ◽  
Dipu Luo ◽  
Bo Zhou ◽  
Kun Zhang
Keyword(s):  
Particle Size ◽  
Shear Modulus ◽  
Vibration Frequency ◽  
Damping Ratio ◽  
Rubber Particle ◽  
Confining Pressure ◽  
Dynamic Strain ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Red Clay

Rubber powder formed from discarded tire rubber is mixed with red clay to form a rubber-red clay mixture. The dynamic triaxial test was carried out on the mixtures under different conditions. The effects of rubber content, rubber particle size, moisture content of mixed soil, compactness, confining pressure, and vibration frequency on shear strain relation, dynamic shear modulus, and damping ratio of the mixture were investigated. The results show that under the same dynamic strain, the dynamic shear stress-strain curve of rubber mixed soil decreases with the increase in rubber particle content and moisture content and decrease in rubber particle size. On the other hand, it increases with the increase in compactness, confining pressure, and vibration frequency, and as the dynamic strain increases, the τd-γd curve becomes more nonlinear. In addition, with the increase in the rubber particle content, the dynamic shear modulus decreased while the damping ratio increased. When the content was 2%, the change was fastest. After continued addition, it gradually became stable, and when the decrease in rubber particle size also shows the same pattern, 2.00 mm rubber-red clay mixture shows better structure. The water content has great influence on dynamic shear modulus and damping ratio of rubber-red clay mixtures. With the increase in compactness, confining pressure, and vibration frequency, the interaction between mixed soil particles was enhanced, the dynamic shear modulus increased, and the damping ratio decreased.

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