Book ChapterDOI
Mechanics and Modeling of Cohesive Frictional Granular Materials
Saurabh Singh,RK Kandasami,Tejas G. Murthy +2 more
- pp 493-500
TLDR
In this paper, the authors used a hollow cylinder torsional testing apparatus which is capable of independently controlling the magnitude and the direction of the three principal stresses in weakly cemented granular materials.Abstract:
In nature, weakly cemented granular materials are encountered in the form of soft rocks such as limestone, sandstone, mudstone, shale, etc. The mechanical behaviour of these materials is quite different from the purely frictional granular materials. The presence of cementation between the grains causes a significant variation in mechanical response under complex boundary conditions. In order to understand the manifestation of this interparticle cohesion at the ensemble level, we have used a hollow cylinder torsional testing apparatus which is capable of independently controlling the magnitude and the direction of the three principal stresses. From this experimental programme, the small strain response, peak strength and post peak behaviour with changing intermediate principle stress ratio (b) and initial mean effective stress (I1) is studied. In addition to the analysis of stress strain behaviour at different b and I1, stress-dilatancy characteristics of these cohesive frictional material are also discussed. This experimental study is followed by calibration and validation of a single hardening constitutive model which considers cementation as additional confinement. Observations from validation exercises suggest that this consideration works well for stress-strain response whereas it fails to predict the volumetric behaviour.read more
Citations
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Journal ArticleDOI
Effect of bedding angle on tunnel slate failure behavior under indirect tension
Han Wang,Fuqiang Ren,Yuan Chang +2 more
TL;DR: In this article, five groups of slate specimens with different bedding angles (β, angle between bedding plane and vertical angle) were used to provide guidance for Muzhailin tunnel design and construction.
Journal ArticleDOI
Review of Proposed Stress-dilatancy Relationships and Plastic Potential Functions for Uncemented and Cemented Sands
TL;DR: In this paper, the proposed stress-dilatancy relations for compressive monotonic loading for cohesionless and cemented sand constitutive models are summarized and the proposed potential function can be calculated by integration of stress-dlatancy relationship.
Journal ArticleDOI
Hydrocarbon Generation Potential Evaluation of Coal Shale Gas of Permo-Carboniferous in Jiyang Depression
TL;DR: In this paper, the residual strata distribution of Carboniferous-Permian in Jiyang Depression, the organic geochemical characteristics of shale and the correlation of hydrocarbon-generating potential of shale by applying geochemistry, petroleum geology and coal geology.
References
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Journal ArticleDOI
The measurement of local axial strains in triaxial tests using lvdts
TL;DR: In this paper, the authors describe an experiment in the use of Linear Variable Differential Transformer (LVDT) to allow accurate measurement of axial displacement over the complete range of strains of interest to geotechnical engineers.
Journal ArticleDOI
Single hardening constitutive model for frictional materials II. Yield critirion and plastic work contours
Poul V. Lade,M.K. Kim +1 more
TL;DR: In this article, a yield function is proposed such that yield surfaces are equivalent to plastic work contours, and two parameters are required in this function: the yield surface resembles an asymmetric tear drop in the principal stress space.
Journal ArticleDOI
Triaxial Testing of Naturally Cemented Carbonate Soil
TL;DR: In this paper, a tensile test was performed on offcuts of calcarenite samples to estimate the degree of cementation and the size of the yield locus, which was found to be similar to other cemented and structured soils.
Journal ArticleDOI
Cementation Effects in Frictional Materials
Poul V. Lade,Daniel D. Overton +1 more
TL;DR: In this article, a series of drained triaxial compression tests on compacted soil, soil-cement, and mortar were performed on three sets of specimens, with the only difference being the amount of cement exchanged with inert rock flour.
Journal ArticleDOI
Single hardening constitutive model for frictional materials III. Comparisons with experimental data
Poul V. Lade,M.K. Kim +1 more
TL;DR: In this paper, a unified constitutive model for the behavior of frictional materials is described, which is based on concepts from elasticity and plasticity theories, including Hooke's law for the elastic behavior, a nonassociated flow rule, a yield criterion that describes contours of equal plastic work, and a workhardening/softening law.
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