1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China; 2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China; 3. Earthquake Administration of Jiangsu Province, Nanjing 210014, China
Abstract：To contribute to a better fundamental understanding of the deformation behavior for Suzhou quaternary sedimentary soils, using GCTS cylinder apparatus cyclic loading testing system, a total of 40 cyclic triaxial tests are performed on various kinds of undisturbed soils at depth less than 100 m corresponding to a wide strain range in the order of 10-5 to 10-2. It is revealed that the variation characteristics of the normalized dynamic shear modulus (G/Gmax) and damping ratio (λ) with the increasing shear strain (γ) are strongly influenced by the sedimentary facies, depths and types of soils. The reduction of G/Gmax with the increasing values of γ when γ <10-4 is small, and the soils show nonlinear elasticity. Under the identical conditions, the test results demonstrate that the increasing depth shifts the values of G/Gmax and the relationship between λ and γ. Moreover, the sediments of flooded plain facies are more linear and have slightly smaller values of λ with the increasing values of γ than the sediments of littoral facies. Under the same sedimentary facies and similar depth, the reduction rates of G/Gmax with the increasing values of γ for silty sand, silty clay and clay have a descending order, and the values of λ under the same γ for silty sand, silty clay and clay increase successively.
陈国兴,卜屹凡,周正龙,张书菡,许汉刚. 沉积相和深度对第四纪土动剪切模量和阻尼比的影响[J]. 岩土工程学报, 2017, 39(7): 1344-1350.
CHEN Guo-xing, BU Yi-fan, ZHOU Zheng-long, ZHANG Shu-han, XU Han-gang. Influence of sedimentary facies and depth on normalized dynamic shear modulus and damping ratio of quaternary soils. Chinese J. Geot. Eng., 2017, 39(7): 1344-1350.
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