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.

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 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.

scholarly journals Resonant Column Test on the Frozen Silt Soil Modulus and Damping at Different Temperatures

2017 ◽  
Author(s):  
Xiaobo Yu ◽  
Rui Sun ◽  
Xiaoming Yuan ◽  
Zhuoshi Chen ◽  
Jiuqi Zhang
Keyword(s):  
Shear Modulus ◽  
Dynamic Properties ◽  
Damping Ratio ◽  
Negative Temperature ◽  
Frozen Soil ◽  
Resonant Column ◽  
Engineering Construction ◽  
Resonant Column Test ◽  
Triaxial Apparatus ◽  
Different Temperatures

The shear modulus and damping ratio of frozen soil are thebasic parameters of its dynamic properties and are often testedwith the dynamic triaxial apparatus. However, the resonantcolumn apparatus is more suitable for the testing at the microstrainlevel. A resonant column apparatus was here used toidentify the varying modes with negative temperature of theinitial shear modulus, modulus ratio, and damping ratio of frozensilt. Correction factor curves indicate that the temperaturehas a great effect on the shear modulus and damping ratio offrozen silt. The curves also show that, within the sensitive stage,the temperature significantly affects the modulus and damping.Within the insensitive stage, the modulus and dampingwere insensitive to the temperature. The experimental resultsand analysis given here provide support for improving seismicdesign codes and offer reasonable parameters for seismicresponse analysis in engineering construction in cold regions.

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.

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.

A Study on the Analysis Method of Soil Layer Seismic Response in Seasonal Frozen Site

2012 ◽  
Vol 238 ◽  
pp. 872-875
Author(s):  
Zhuo Shi Chen ◽  
Shang Jiu Meng ◽  
Yu Run Li ◽  
Long Wei Chen
Keyword(s):  
Shear Modulus ◽  
Soil Layer ◽  
Frozen Soil ◽  
Test Method ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Analysis Method ◽  
Soil Site ◽  
Seasonal Frozen Soil ◽  
The Impact

The analysis of ground motion on seasonal frozen soil mainly focused on the conventional soil, neglecting the impact of the permafrost which causes the obvious defeats in the existed calculation procedure. In this paper, the author proposed that we should apply the field test of shear wave velocity to the soil layer response calculation, improve the test method of dynamic shear modulus, and adopt the regular analysis method of soil layer response to the calculation of frozen soil site.

Shear Modulus and Damping Ratio of Gravel Material

2011 ◽  
Vol 105-107 ◽  
pp. 1426-1432 ◽  
Author(s):  
De Gao Zou ◽  
Tao Gong ◽  
Jing Mao Liu ◽  
Xian Jing Kong
Keyword(s):  
Shear Modulus ◽  
Shear Strain ◽  
Strain Amplitude ◽  
Damping Ratio ◽  
Confining Pressure ◽  
Dynamic Shear Modulus ◽  
Test Results ◽  
Dynamic Shear ◽  
Data Points ◽  
Shear Strain Amplitude

Two of the most important parameters in dynamic analysis involving soils are the dynamic shear modulus and the damping ratio. In this study, a series of tests were performed on gravels. For comparison, some other tests carried out by other researchers were also collected. The test results show that normalized shear modulus and damping ratio vary with the shear strain amplitude, (1) normalized shear modulus decreases with the increase of dynamic shear strain amplitude, and as the confining pressure increases, the test data points move from the low end toward the high end; (2) damping ratio increases with the increase of shear strain amplitude, damping ratio is dependent on confining pressure where an increase in confining pressure decreased damping ratio. According to the test results, a reference formula is proposed to evaluate the maximum dynamic shear modulus, the best-fit curve and standard deviation bounds for the range of data points are also proposed.

Experimental Study on Dynamic Characteristics of Ionic Soil Stabilizer Reinforcing Red Clay

2011 ◽  
Vol 374-377 ◽  
pp. 1391-1395
Author(s):  
Xue Song Lu ◽  
Wei Xiang
Keyword(s):  
Shear Modulus ◽  
Shear Strain ◽  
Dynamic Condition ◽  
Damping Ratio ◽  
Confining Pressure ◽  
Natural Soil ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Red Clay ◽  
Soil Stabilizer

Based on the red clay of Wuhan reinforced by Ionic Soil Stabilizer, the red clay soil is treated by different matches of ISS at first, then is tested in the Atterberg limits test and dynamic triaxia test. The results show that the plastic index decreases, and the red clay were greatly improved under the dynamic condition, the maximum dynamic shear modulus ratio acquired an incensement of 27.72% on average after mixing the ISS into the red clay. In addition, It was concluded that the confining pressure influenced the dynamic shear modulus and damping ratio to a certain extent. Given the same strain conditions, with the incensement of confining pressure increases, the dynamic shear modulus increased and the damping ratio decreased. Moreover, when plotting the dynamic shear modulus versus the dynamic shear strain, the similar curve can be formed for both the natural soil and the modified one, the dynamic shear modulus monotonously decreased with the incensement of the dynamic shear strain. However, the value of dynamic shear modulus differed in the same shear strain between the natural soil and the soil modified by ISS.

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