Comparison of experimental results in a testing device for swelling rocks

Vergara, Maximiliano R.; Balthasar, K.; Triantafyllidis, Theodoros

doi:10.1016/j.ijrmms.2013.12.018

Cited by 7 publications

(2 citation statements)

References 1 publication

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“…The test setup was developed at the Institute of Soil Mechanics and Rock Mechanics (IBF) at the Karlsruhe Institute of Technology (KIT) and last modified by Vergara (2019). A detailed description and comparison to other simple cells can be found in Vergara et al (2014). The test setup is shown in Fig.…”

Section: Testing Equipment and Test Methodsmentioning

confidence: 99%

Experimental Investigations on Hydro-mechanical Processes in Reconstituted Clay Shale and Their Significance for Constitutive Modelling

et al. 2023

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The hydro-mechanical processes of a reconstituted clay shale (Opalinus Clay) were studied and implications for constitutive modelling of swellable clay shales derived. The study aims to provide further insights into these coupled processes. For that, oedometric swelling tests with varying boundary conditions and loading paths, oedometric compression tests under dry and saturated conditions, and permeability tests were performed. The results showed a unique preloading line for the dry state when plotting the void ratio against the vertical stress. For saturated states, this line was shifted to the left (to smaller stresses) which revealed a severe reduction of preloading stress due to saturation. All loading paths converged in a normal compression line (NCL) regardless of the mechanical boundary conditions during saturation. A trend line affine to the NCL was established for swelling pressures at different initial void ratios. The influence of saturation on the mechanical properties became further evident, as the un-/reloading stiffness was significantly reduced. A linear relationship between volumetric deformation and saturation was found. A severe swelling induced reduction of permeability in the saturated state was demonstrated and confirmed by the analysis of consolidation processes during oedometric loading. The experimental findings were used to derive fundamental assumptions for constitutive modelling and were discussed within a numerical framework for expansive soils.

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Section: Testing Equipment and Test Methodsmentioning

confidence: 99%

Experimental Investigations on Hydro-mechanical Processes in Reconstituted Clay Shale and Their Significance for Constitutive Modelling

et al. 2023

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“…With the test of swelling qualities under the lateral restriction Zuo et al [6] figured out the negative logarithmic function relation between the axial stress and swelling ratio of argillaceous slate during the process of its swelling. Vergara et al [7] improved the measuring system and loading system of uniaxial consolidation equipment recommended by ISRM, which can better control the measurement of swelling deformation by the stress boundary condition. Pimentel and Anagnostou [8] bettered the loading system and the lateral confined device of the uniaxial expander and merged several independently controlled expanders which can effectively measure the long-term mechanical properties of swelling rock such as swelling, creep, and chemical-mechanical effects; later Pimentel [9] summarized the current tests of expansibility of swelling rock and states the experimental equipment and methods should be further advanced to meet the needs of various swelling rock projects.…”

Section: Introductionmentioning

confidence: 99%

A Lateral Unconfined Swelling Test for Swelling Rocks

Zhang

Gao

Chen

et al. 2018

Advances in Materials Science and Engineering

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A simple experimental equipment and test scheme is designed to estimate the swelling deformation under the lateral unconfined condition with coupling effect of uniaxial load and water-rock interaction. This paper carried out the swelling test under the lateral unconfined condition and analyzed the qualities of lateral unconfined swelling of weak swelling rock by applying simple self-designed saturated equipment to the swelling test on the platform of microcomputer-controlled rock shear rheological tester RYL-600. As a result of this study, the following conclusions were derived: (1) considering the coupling effect of load and water, the stress level is considerably lower than the mudstone-saturated uniaxial compressive strength, and it is discovered that the coupling effect is striking. (2) The swelling reveals the demonstrable time effect, which increases rapidly at the beginning of the swelling deformation, and after that, the deformation tends to maintain a certain value. (3) Both the rate and the scale of swelling deformation are restrained by the axial load.

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Effect of Compaction Banding on the Hydraulic Properties of Porous Rock: Part I—Experimental Investigation

et al. 2021

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The mechanical behavior and the influence of compaction banding on the hydraulic properties in soft porous rocks were studied. The tested rock was Calcarenite Tuffeau de Maastricht. In the frame of experimental investigations, triaxial and oedometric tests were conducted under dry and drained conditions. The results demonstrated that the rock is forming discrete compaction bands under high confining stresses and steep angle shear bands under low confining stresses. Permeability measurements during the oedometric and triaxial compression tests under drained conditions demonstrated that the axial permeability decreases with increasing axial strain. The maximum permeability decrease was three orders of magnitude for 40% of axial strain.

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Comparison of experimental results in a testing device for swelling rocks

Cited by 7 publications

References 1 publication

Experimental Investigations on Hydro-mechanical Processes in Reconstituted Clay Shale and Their Significance for Constitutive Modelling

Experimental Investigations on Hydro-mechanical Processes in Reconstituted Clay Shale and Their Significance for Constitutive Modelling

A Lateral Unconfined Swelling Test for Swelling Rocks

Effect of Compaction Banding on the Hydraulic Properties of Porous Rock: Part I—Experimental Investigation

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