Influence of grain size distribution on dynamic shear modulus of sands

Abstract

Abstract:The paper presents the results of laboratory tests, that verify the correlation between the grain-size characteristics of non-cohesive soils and the value of the dynamic shear modulus. The problem is a continuation of the research performed at the Institute of Soil Mechanics and Rock Mechanics in Karlsruhe, by T. Wichtmann and T. Triantafyllidis, who derived the extension of the applicability of the Hardin's equation describing the explicite dependence between the grain size distribution of sands and the values of dynamic shear modulus. For this purpose, piezo-ceramic bender elements generating elastic waves were used to investigate the mechanical properties of the specimens with artificially generated particle distribution. The obtained results confirmed the hypothesis that grain size distribution of non-cohesive soils has a significant influence on the dynamic shear modulus, but at the same time they have shown that obtaining unambiguous results from bender element tests is a difficult task in practical applications.

Optical flow method for measuring deformation of soil specimen subjected to torsional shearing

“…A few types of granular, non-cohesive materials were selected for the study, which were prepared according to [62] (the specimen was prepared from pre-formed non-cohesive soil fractions). All specimens were made of soils that according to ISO 14688-1:2002 standard [63] can be classified as sands (Sa).…”

The Study of Deformation Properties of a Sand Soil - Expanded Polystyrene Granules Mixture Under Cyclic Loading Conditions

“…Примерами исследований, направленных на совершенствование конструкций оснований и технологий их устройства, могут служить работы, целью которых является уточнение модели деформирования грунта под действием статической [14] и динамической [15], [16] нагрузки. Особый интерес представляют результаты экспериментальных и лабораторных исследований, таких, как, например, работы, исследующие влияние гранулометрического состава несвязных грунтов на величину динамического модуля сдвига [17] и модуля деформации [18]. Необходимым условием проведения экспериментальных исследований является оборудование, позволяющее регистрировать исследуемые процессы дистанционно и бесконтактно [19], а также программное обеспечение для корректной обработки полученных данных [20].…”

A Fractal Entropy-Based Effective Particle Model Used to Deduce Hydraulic Conductivity of Granular Soils

“…The particle size distribution (PSD) curve is an important soil characteristic that is widely used for preliminary estimates of numerous physical properties of granular soils, such as potentials of internal erosion, particle breakage, sedimentation, and saturated hydraulic conductivity, etc. [1][2][3][4][5]. For instance, Seelheim [6] and Hazen [7] pioneered the determination of saturated hydraulic conductivity based on the semi-logarithmic PSD curve.…”