Influence of Loading History and Boundary Conditions on Parameters of Soil Constitutive Models

Architecture, Civil Engineering, Environment

2016

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This paper is a continuation of the paper “Triaxial tests on weak cohesive soils – some practical remarks (part 1)” and concerns the problems related to the preparation of weak cohesive soils for triaxial testing. This part (2/2) presents detailed description and discussion of the issues related to installation of specimen in the apparatus and assembling various accessories before the main test. It is based on the Authors’ own experience and literature review. Some solutions, which make the work with weak soils easier and, at the same time, increase the reliability of the results, are suggested e.g.: the paraffin method or the use of a special frame enabling repositioning of local microdisplacement sensors during the triaxial test. The issues connected with soil sampling and forming of triaxial specimens have been included in part 1/2 of this article. In the Authors opinion, the text (parts 1 and 2) may constitute an important hint for researchers completing a triaxial testing station intended for testing weak cohesive soils.

Section: Membrane and Filter-papersmentioning

confidence: 99%

“…T h e S i l e s i a n U n i v e r s i t y o f Te c h n o l o g y No. 3 / 2 0 1 6 ters of soil constitutive models for normally consolidated Speswhite kaolin [5,6].…”

Section: A R C H I T E C T U R E C I V I L E N G I N E E R I N G E N V I R O N M E N Tmentioning

confidence: 99%

Triaxial Tests On Weak Cohesive Soils – Some Practical Remarks (Part 2)

Jastrzębska

Architecture, Civil Engineering, Environment

2016

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“…Alternating solutions are described. Among others, they are based on the Authors' experience gained from the research on the determination of stress-strain characteristics of cyclically loaded specimens of kaolin from Tułowice [5][6][7] and on the estimation of the influence of loading history on the parameters of soil constitutive models for normally consolidated Speswhite kaolin [8,9]. In the next chapter, the issues related to sampling and the inevitable structure and stress state disturbance will be presented.…”

Section: A R C H I T E C T U R E C I V I L E N G I N E E R I N G E N V I R O N M E N Tmentioning

confidence: 99%

Triaxial Tests On Weak Cohesive Soils – Some Practical Remarks (Part 1)

Architecture, Civil Engineering, Environment

Jastrzębska

2016

Self Cite

“…by Burland [1], Atkinson et al [2] or Kowalska [3]. Thus even more important becomes the use of the stress path method (Lambe [4], Lambe and Marr [5], Davis and Poulos [6]) or the loading path method (Gryczmański and Kowalska [7], Kowalska [8]) in analyses of real 'soil -structure' interaction problems.…”

Section: Introductionmentioning

confidence: 99%

“…where σ' 1 , σ' 2 and σ' 3 are respectively: effective major, medium and minor principal stress (σ' 1 > σ' 2 > σ' 3 ).…”

Section: Introductionmentioning

confidence: 99%

Simulation of Stress Paths Derived from FEM Analysis in Triaxial Tests

Archives of Civil Engineering

2013

Reliable estimation of geotechnical parameters is often based on reconstruction of a complete loading process of subsoil on a specimen in laboratory tests. Unfortunately laboratory equipment available in many laboratories is sometimes limited to just a triaxial apparatus -the use of which generates diffi culties whenever a non-axisymmetric problem is analysed. The author suggests two simple operations that may be done to improve the quality of simulation in triaxial tests. The fi rst one is based on the use of triaxial extension along the segments of the stress path p'-q- for which the Lode's angle values are positive. The second one consists in a modifi cation of the equivalent stress value in such a way that the current stress level in the specimen complies with results of FEM analysis.