Compressibility of clays determined from in – situ tests

Üzeler, Volkan
The objective of this thesis is to establish an understanding regarding the estimations of commonly used geotechnical soil parameters from in situ tests. In order to determine the profile, strength and deformability of soils in a project site, execution of site investigation studies consisting borehole drilling, in - situ and laboratory testing are a must. In – situ testing of soils has become growingly popular during site investigations especially for being practical and economic. Hence, estimations of geotechnical parameters from in – situ test results hold a significant place in the geotechnical design practice. In the content of this study, reasonability and accuracy of the widely used emprical correlations about the estimation of undrained shear strength and coefficient of volume compressibility of cohesive soils from in – situ tests were evaluated. In addition, direct correlations between some of the in – situ test parameters were also discussed in order to determine the applicability of such relationships. For this purpose, the data of five extensive site investigation studies performed in mostly cohesive soils from Turkey and Europe were compiled and analyzed in a detailed manner. In – situ testing database is consisted of “ Standard Penetration Test”, “Cone Penetration Test”, “Pressuremeter Test” and “Flat Dilatometer Test” In – situ test parameters were evaluated together with the results of laboratory tests performed on the samples obtained during site investigation studies. According to the comparison of results with the studies in the literature, a general agreement was observed especially for the cases of similar soil conditions


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Although post-liquefaction shear strengths of soils are very small, their accurate estimations are critical for post-liquefaction stability assessments. Due to the large strain nature of the liquefaction problem and difficulties in preparing re-constituted soil samples representing field conditions, laboratory testing-based assessments are not commonly used. Instead, semi-empirical residual strength assessments based on back analyses of liquefaction-induced failure cases are used for the purpose. Earlier st...
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A Bayesian framework for probabilistic assessment of the initiation of seismic soil liquefaction is described, A database, consisting of post-earthquake field observations of soil performance, in conjunction with in situ "index" test results is used for the development of probabilistically-based seismic soil liquefaction initiation correlations. The proposed stochastic model allows full and consistent representation of all relevant uncertainties. including (a) measurement/estimation errors, (b) model imperf...
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Effects of mixture design parameters and compaction methods on the properties of roller compacted concrete pavements
Şengün, Emin; Yaman, İsmail Özgür; Department of Civil Engineering (2019)
The aim of the thesis is to develop laboratory compaction methodology suitable for simulating field compaction procedures used for creating roller compacted concrete (RCC) mixtures. Based on this methodology, mechanical performance and fracture properties of RCC mixtures of different strength classes were determined and long-term fatigue performance of RCC mixtures with different strength levels was investigated. In this context, a three-phase experimental study was designed. First, mixtures with different ...
Geotechnical characterization and rock mass classification of the Antalya karstic rock masses
Sopacı, Evrim; Akgün, Haluk; Department of Geological Engineering (2012)
This thesis identifies the geotechnical parameters of the Antalya karstic foundation rocks (travertine/tufa), which are highly variable in nature, by means of geological observations, geotechnical site investigations, and field and laboratory geomechanics tests to examine karstic (mainly tufa) rock mass behavior. Several geotechnical parameters such as porosity, seismic wave velocity, uniaxial compressive strength, Young’s modulus, tensile strength, etc. that are thought to have significant influence on roc...
Citation Formats
V. Üzeler, “Compressibility of clays determined from in – situ tests,” M.S. - Master of Science, Middle East Technical University, 2013.