Analysis of multistage triaxial test results for a strain-hardening rock

Bro, Anders

doi:10.1016/s1365-1609(97)80040-8

Cited by 14 publications

(4 citation statements)

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“…Thus as load increased, the contacts between the coarse particles exceeded their shear strength and mobilised, initiating a short term plastic behaviour. This is in agreement with the model described by Bro, 1997 127 . The semi-quantitative results obtained from the triaxial investigation were analysed by the Mohr-Coulomb criterion 85,114 and its derived equation 128 given below and are presented in Figure 6.9.…”

Section: Relationship Of Ucs and Porositysupporting

confidence: 92%

A structural and physico-chemical investigation of mineral/organic composites as novel components of engineered fill

Tyrologou¹,

Τυρολόγου²

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Sustainable engineering fill represents an increasingly important approach to the management of bulk non-marketable materials and the restoration of brownfield land, particularly land arising from mining and metallurgical activities. Embankments and restoration of brownfield sites are examples that already make use of engineering fill from bulk wastes in order to provide stable ground. Biostore, the subject of this research, is a novel type of stable engineering rockfill proposed for composite utilisation of bulk organic and mineral material, which would otherwise be waste.The thesis presents a literature review regarding environmental problems of bulky wastes such as coarse mineral wastes, construction and demolition material, green waste, fine pozzolanic pulverised fuel ash and digested sewage sludge. It also discusses current remediation practices for brownfield land. The main body of the thesis reports methods and results of an environmental and geotechnical study of the composites, based on laboratory investigation.Formulation of the composites using statistical factorial design has ensured proper understanding of component interaction and subsequent optimisation of the composite parameters. Solidification and stabilisation of the materials took place by compacting and cementing the wastes together. The coarse minerals formed a skeletal support whereas fine pozzolanic material (sewage sludge and pulverised fuel ash) cemented the components together with the aid of calcium oxide.The composites were tested for their porosity and micro-structure using novel methods (for these kinds of materials), e.g., nuclear magnetic resonance and super-critical drying. Furthermore, the Biostore was tested for uniaxial and triaxial strength, hydraulic conductivity, chemical leaching and cementatious mineralogy.The investigation demonstrated an inverse linear relation between decreasing porosity and increasing uniaxial strength with time. Micro-structural investigation revealed that this was due to crystallisation of ettringite and portlandite. The results indicate the potential for application of Biostore at a field scale.

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Section: Relationship Of Ucs and Porositysupporting

confidence: 92%

A structural and physico-chemical investigation of mineral/organic composites as novel components of engineered fill

Tyrologou¹,

Τυρολόγου²

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“…Relatively undisturbed samples can be tested in a geotechnical laboratory to evaluate the density and moisture content of the rock, and depending on the scale of interest, multistage triaxial tests (Bro, 1996(Bro, , 1997. Ideally, consolidated undrained tests with pore pressure measurements will measure the strength of specimens with various volumetric block proportions (Lindquist, 1994a) as a necessary step in estimating the overall strength of the rock mass as explained further below.…”

Section: Geopractice Methods For Characterization Of Mélangesmentioning

confidence: 99%

“…Because of scale independence, mélange and other bimrocks at the scale of laboratory specimens are closer to being scale models of the parent rock masses than is generally true in geotechnical engineering. Laboratory specimens of Franciscan mélange from the dam foundation (Goodman and Ahlgren, 2000) were tested using multistage triaxial compression tests such as those described by Lindquist (1994), Lindquist and Goodman (1994), Bro (1996Bro ( , 1997, and Goodman and Ahlgren (2000). Given that the diameter of the laboratory specimens was the characteristic engineering dimension L c , blocks in the specimens were those intact inclusions that had maximum dimensions between ~5% and 75% of the specimen diameter.…”

Section: Case History 3: Estimate Of the Strength Of A Mélange Underlmentioning

confidence: 99%

Geopractitioner approaches to working with antisocial mélanges

Medley¹,

Zekkos²

2011

Mélanges: Processes of Formation and Societal Significance

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Although mélanges are exciting, puzzling, and controversial to geologists, it is geopractitioners and contractors who must work with them to engineer the constructed works of Society. Geopractitioners include geotechnical engineers, geological engineers, engineering geologists, and rock engineers. Mélanges are the most intractable bimrocks (block-in-matrix rocks), complex geological mixtures composed of hard blocks of rocks surrounded by weaker matrix, and are famously exemplifi ed by those within the Franciscan Complex of Northern California. Bimrocks also include olistostromes, weathered rocks, fault rocks, and lahars. The conventional characterization, design, and construction procedures used by geopractitioners for well-behaved stratifi ed rocks and soils are not well suited to mélanges. The considerable engineering and construction diffi culties related to mélanges burden Society to the extent that they can be considered "antisocial." Case histories exemplify a recommended systematic procedure for characterization, design, and construction with mélanges. Geopractitioner approaches to characterizing California's chaotic Franciscan mélanges are applicable to geologists and geopractitioners working in fault zones, weathered rocks, lahars, and other bimrocks, and suggestions are offered for collaborative research between geologists and geopractitioners.

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“…A fault-specific determination of cohesion and angle of internal friction again requires core samples for triaxial rock mechanical testing in the lab. If the material is not suitable for multistage testing [67][68][69], at least three samples are required for one triaxial test. Thus, it is very rare that proper rock samples for triaxial testing of fault zone rocks are available to populate a numerical model with specific frictional fault rock properties [15,24].…”

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Elastic and Frictional Properties of Fault Zones in Reservoir-Scale Hydro-Mechanical Models—A Sensitivity Study

Treffeisen

Henk

2020

Energies

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The proper representation of faults in coupled hydro-mechanical reservoir models is challenged, among others, by the difference between the small-scale heterogeneity of fault zones observed in nature and the large size of the calculation cells in numerical simulations. In the present study we use a generic finite element (FE) model with a volumetric fault zone description to examine what effect the corresponding upscaled material parameters have on pore pressures, stresses, and deformation within and surrounding the fault zone. Such a sensitivity study is important as the usually poor data base regarding specific hydro-mechanical fault properties as well as the upscaling process introduces uncertainties, whose impact on the modelling results is otherwise difficult to assess. Altogether, 87 scenarios with different elastic and plastic parameter combinations were studied. Numerical modelling results indicate that Young’s modulus and cohesion assigned to the fault zone have the strongest influence on the stress and strain perturbations, both in absolute numbers as well as regarding the spatial extent. Angle of internal friction has only a minor and Poisson’s ratio of the fault zone a negligible impact. Finally, some general recommendations concerning the choice of mechanical fault zone properties for reservoir-scale hydro-mechanical models are given.

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Analysis of multistage triaxial test results for a strain-hardening rock

Cited by 14 publications

References 0 publications

A structural and physico-chemical investigation of mineral/organic composites as novel components of engineered fill

A structural and physico-chemical investigation of mineral/organic composites as novel components of engineered fill

Geopractitioner approaches to working with antisocial mélanges

Elastic and Frictional Properties of Fault Zones in Reservoir-Scale Hydro-Mechanical Models—A Sensitivity Study

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