Studies on Cyclic and Dynamic Loading on Cohesive Soil in Road Engineering

Abstract

Soil investigations concerning cyclic and dynamic loading differ from static analysis. The Problem with the abovementioned loads becomes more important, when cohesive soils are taken into consideration. There are plenty of scientific reports containing the analyses of non-cohesive soil behaviour, yet there is still a lack of similar studies on cohesive soils. Repeated loading and dynamic excitations differ between themselves and parameters which are used to describe those phenomena are not congruent. Road constructors seek new approaches to design methods, which would take into account more types dynamic and cyclic excitations. For a successful utilisation of these occurrences in designing codes, mechanical parameters, such as resilient modulus Mr, shear modulus G and Poisson ratio υ or dumping ratio D, need to be determined. The laboratory tests were conducted on sandy clays, which are a common soil in Poland, using specialized laboratory equipment, such as a resonant column and cyclic triaxial apparatus. The aim of the work presented in this paper was to measureand analyse the abovementioned mechanical characteristics. The paper ends with conclusions regarding the application of cyclic and dynamic loading characteristics in road design.

Engineering Properties of Norwegian Peat for Calculation of Settlements

“…Internationally, several theories specific for the prediction of settlement on peat have been developed based on simple empirical and semiempirical correlations e.g. Flaate (1968), Al-Khafaji and Andersland (1981), Edil and Mochtar (1984), Edil and Simon-Gilles (1986), Stinnette (1998), Den Haan andEl Amir (1994), Carlsten (2000), Sas et al (2011), Szymanski et al (2005, Noto (1987), Hayashi et al (2016). It is difficult to make general statements on the success or otherwise of these methods for predicting settlement in peat.…”

Cohesive Soil Behavior Under Cyclic Loading in Undrained Conditions

“…In past years, most extensive tests were performed for phenomena of ratcheting which is observed in case of high deviatory stress in triaxial tests. Eventual exceptions to the pattern of soil response observed in the ratcheting zone were accounted to the cyclic plastic creep [27][28][29][30][31].…”

Characteristic of small-strain stiffness of fine-grained soils based on advanced laboratory tests

“…Soil stiffness tests using different test methods and techniques were described, e.g. by [12,16,30,39,49,[54][55][56][57][58][59][60].…”