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Author: Yaning Wang (Ph. D.) Publisher: ISBN: Category : Languages : en Pages : 324
Book Description
The study of the dynamic properties of two specific kinds of granular soils is performed using torsional resonant column testing. The sandy soils are: (1) liquefiable sand from Christchurch, New Zealand, and (2) calcareous sand from Puerto Rico. The effects of isotropic effective confining pressure, shear strain amplitude, void ratio, and total unit weight on the small-strain and nonlinear dynamic properties of both types of sand are presented and discussed. Empirical models from previous studies are examined to determine how well the models fit the test results.
Author: Yaning Wang (Ph. D.) Publisher: ISBN: Category : Languages : en Pages : 324
Book Description
The study of the dynamic properties of two specific kinds of granular soils is performed using torsional resonant column testing. The sandy soils are: (1) liquefiable sand from Christchurch, New Zealand, and (2) calcareous sand from Puerto Rico. The effects of isotropic effective confining pressure, shear strain amplitude, void ratio, and total unit weight on the small-strain and nonlinear dynamic properties of both types of sand are presented and discussed. Empirical models from previous studies are examined to determine how well the models fit the test results.
Author: RM. Chung Publisher: ISBN: Category : Damping Languages : en Pages : 10
Book Description
Torsional resonant column tests were performed on Monterey No. 0 sand of 60% relative density under confining pressures ranging from 10 to 300 kPa to evaluate the dynamic properties of the sand. Both solid and hollow cylindrical specimens were used in testing, and shear moduli and damping ratios were determined for cyclic shear strain amplitudes from 10-4 to 5 × 10-2%. The test results indicated that the type of specimen, that is, solid or hollow cylinder, had no significant effect on the calculated shear moduli and damping ratios, except that at very low strain amplitudes (?
Author: Z. X. Yang Publisher: ISBN: Category : Soil dynamics Languages : en Pages : 26
Book Description
The shear modulus and damping ratio of soils at low to medium strains are essential input parameters in dynamic response analysis of soils. As soil elements in the field always have a history of being subjected to vibrations due to earthquakes, construction works, and vehicle motions, etc., the previbration effect on the dynamic properties of soils needs to be addressed appropriately. This study presents a series of tests performed by a newly developed resonant column system that enables the assessment of the dynamic properties of soils that have only undergone dozens of vibration cycles to investigate the impact of the vibration history on the dynamic properties of dry sand. Both the shear modulus and damping ratio of sand under different confining pressures (p′) are measured after the application of a previbration with a wide range of vibration amplitudes (?pre) and number of cycles (N). The results show that an elastic threshold strain exists for the dynamic properties of sand, beyond which the effect of the vibration history can be identified from the shear modulus reduction and damping ratio curves. The results also confirm that the effect of the vibration history on dry sand depends on the test variables of?pre,N, andp′. In addition, a new interpretation method is proposed to quantify the combined effects of?preandNon the signature of the vibration history, which could potentially be useful for interpreting the dynamic properties of the in situ soils that may experience previbration.
Author: Boonam Shin Publisher: ISBN: Category : Languages : en Pages : 188
Book Description
This study was motivated by the fact that many times intact specimens with a number of oversized particles are dynamically tested in the laboratory and the impact of the particles on the dynamic properties is unknown. The effects of oversized particles represented by gravel particles on the shear modulus (G) and material damping ratio (D) of a uniform sand were evaluated in the linear ([gamma] ≤ 0.001%) and nonlinear ([gamma] > 0.001%) ranges of shear strain with combined resonant column and torsional shear (RCTS) equipment. The sand used in this investigation is a uniform sand as a reference, well-characterized material on the dynamic properties. Sand-gravel specimens were constructed using the undercompaction method. A variety of rounded gravel particles was used in building the specimens. Dynamic tests on the sand-gravel specimens were performed, and the tests results are presented. Among the findings of this investigation are that, compared to uniform sand: (1) oversized gravel particles symmetrically located along the longitudinal axis in uniform sand generally decreased slightly the small-strain shear modulus (Gm̳a̳x̳), (2) oversized gravel particles asymmetrically located away from the longitudinal axis of rotation resulted in slight increases in Gm̳a̳x̳ and the small-strain material damping ratio (Dm̳i̳n̳), (3) the G - log [gamma] relationships of sand-gravel specimens with asymmetrically located gravel particles are generally above those with gravel particles symmetrically located along the longitudinal axis, and (4) the G/Gm̳a̳x̳ - log [gamma] relationships of all specimens were reasonably close for the nonlinear ranges covered in these tests ([gamma] 0.05 % and G/Gm̳a̳x̳ 0.6). As long as the oversized particles were near the axis of rotation, the particles had little effect on the dynamic properties (Gm̳a̳x̳, Dm̳i̳n̳ and G - log [gamma] relationships) regardless of sizes and numbers of particles. However, once the oversized particles were located away from the axis of rotation and closer to the perimeter of the specimen, the oversized particles influenced the dynamic properties. Finally, the additions of oversized particles located both symmetrically and asymmetrically in the uniform sand specimens have little impact on the nonlinear dynamic properties (G/Gm̳a̳x̳ - log [gamma] and D - log [gamma] relationships) which compared well with uniform sand.
Author: David Umberg Publisher: ISBN: Category : Languages : en Pages : 792
Book Description
The results from an experimental study on the dynamic properties of sand with nonplastic silt are presented. Combined resonant column and torsional shear equipment is used to evaluate the effects of confining pressure, shearing strain, frequency, and number of cycles of loading on the dynamic properties of silty sand. The goal of this study is to determine if relationships in the literature for sands and gravels are accurate for predicting the shear modulus and material damping characteristics of soil with nonplastic fines or if the incorporation of a fines content parameter improves predictions. This goal was primarily accomplished by reconstituting and testing samples of an alluvial deposit from Dillon Dam, Dillon, Colorado according to predetermined gradation curves with variable amounts of non-plastic fines. Among the findings of this investigation are: (1) soil parameters such as Cu and D50 can be related to dynamic properties of soils with up to 25% fines, (2) the effects of non-plastic fines on the small-strain dynamic properties of soils are not very pronounced for soils with less than 25% fines, and (3) an increase in the amount of non-plastic fines in uniform soils or soils with more than 25% fines generally results in lower values of small-strain shear modulus, higher values of small-strain material damping, and more linear G/Gmax - log([gamma]) and D - log([gamma]) curves. The effect of non-contacting, larger granular particles in a finer soil matrix is also investigated along with the impact of removing larger particles from laboratory samples.
Author: Yaning Wang (Ph. D.)
Author: Yaning Wang (Ph. D.)
Author: 李翊群
Author: RM. Chung
Author: Sheng-Huoo Ni
Author: Z. X. Yang
Author: Deron J. Van Hoff
Author: Boonam Shin
Author: Jaywantsinh G. Vaghela
Author: David Umberg
Author: Lidong Bai