Evolution of mesostructure and mechanical characteristics of cemented granular soils under undrained cyclic loads

Distinct improvement techniques can be used when civil engineering structures are to be built on soils that do not present suitable mechanical characteristics. The soil improvement techniques can vary from compaction to chemical and mechanical stabilisation. This work focuses on the specific case of granular soils treated with low amount of cement. The study aims to investigate the behaviour of a cemented sand under multiaxial loading conditions. A series of advanced tests on reconstituted cemented sand were conducted in a Cubical Cell Apparatus (CCA) and exploration of material response including failure limits under different constant stress paths (θ = 0° and θ = 120°) in the octahedral (π) plane were performed. Results showed strength is higher in vertical direction than in horizontal direction.

Download Full-text

Assessment of mechanical characteristics of steel subject to cyclic loads effect on non-standard compact specimens

MATEC Web of Conferences ◽

10.1051/matecconf/201822404025 ◽

2018 ◽

Vol 224 ◽

pp. 04025 ◽

Cited By ~ 5

Author(s):

Rim N. Khasanov ◽

Aybulat S. Valiev ◽

Iskander R. Kuzeev

Keyword(s):

Damage Accumulation ◽

Mechanical Characteristics ◽

Cyclic Loads ◽

Yield Limit ◽

Fatigue Damage Accumulation ◽

Series Of Experiments ◽

Specific Fracture ◽

Fracture Work ◽

Dimensional Surface

It is showed by experiments that the use of compact specimens for determination of fracture work of steel that undertook cyclic deformations enables to identify metal with a number of cumulative fatigue damages. The yield limit determined in the first series of experiments was used for cycling parameters determination: 0.9 from the yield limit was set for damage accumulation in the elastoplastic stress range. At the same time an average cycle load was 8.9 kN, and an amplitude was 8.6 kN. It is demonstrated that specific fracture work increases upon the increase of compact specimens’ thickness. The tendency of specific fracture work decrease is observed upon fatigue damage accumulation. Thin specimens are particularly sensitive to damage accumulation. The results of the experiments indirectly support the hypothesis of fractional-dimensional surface layer existence.

Download Full-text

Developments in Modeling Liquefaction of Granular Soils, Caused by Cyclic Loads

Applied Mechanics Reviews ◽

10.1115/1.2130362 ◽

2006 ◽

Vol 59 (2) ◽

pp. 91-106 ◽

Cited By ~ 27

Author(s):

Andrzej Sawicki ◽

Jecek Mierczyński

Keyword(s):

Cyclic Loading ◽

Pore Pressure ◽

Present State ◽

Review Article ◽

Granular Soils ◽

Cyclic Loads ◽

The Third ◽

Theoretical Approaches ◽

Shearing Resistance ◽

Historical Developments

The aim of this review article is to present historical developments of mechanics of saturated granular soils in relation to the liquefaction phenomenon, as well as to analyze the present state of this subject in connection with practically important problems. The first part is an introduction to mechanics of liquefaction, in order to make this paper self-contained. Then, some basic empirical findings are described. In the third part, the development of theoretical approaches to liquefaction-related problems, such as cyclic loading compaction and pore pressure accumulation, or cyclic loading degradation of shearing resistance, is presented. The fourth part deals with the presentation of the methods applied for solving practically important problems and those that have not been solved satisfactorily. The last part of this paper presents some of the most important conclusions and suggestions regarding further research. There are 152 references cited in this review article, and a supplementary bibliography of 45 publications is also included.

Download Full-text