scholarly journals Analysis of the Swelling Pressure Development in Opalinus Clay – Experimental and Modelling Aspects

2009 ◽  
Author(s):  
H. Péron ◽  
S. Salager ◽  
M. Nuth ◽  
P. Marschall ◽  
L. Laloui
Keyword(s):  
Swelling Pressure ◽  
Opalinus Clay ◽  
Pressure Development

scholarly journals High-density bimodal bentonite blends for hydraulic sealings at the Ibbenbüren coalmine

Clay Minerals ◽  
2015 ◽  
Vol 50 (3) ◽  
pp. 391-403 ◽  
Author(s):  
Felicitas Wolters ◽  
Wiebke Baille ◽  
Katja Emmerich ◽  
Eva Schmidt ◽  
Christian Wolters ◽  
...  
Keyword(s):  
Swelling Pressure ◽  
Mining Area ◽  
Applied Strain ◽  
Sand Mixture ◽  
Pressure Tests ◽  
Pressure Development ◽  
Pressure Water ◽  
Sufficient Magnitude ◽  
Sealing Materials ◽  
Oedometer Tests

AbstractThe two high-pressure water-retaining dams at the Ibbenbüren coalmine in Münsterland (Germany) have to perform reliably under the induced tension caused by further exploitation of the current mining area. The load-bearing and the sealing functions of the new barriers were separated and new sealing materials were developed. An innovative multilayer sealing system of bentonite and sandwiched equipotential layers (SANDWICH) supporting homogeneous swelling and sealing, independent of formation water (Nüesch et al., 2002), was applied in this project. A testing program of strain-controlled swelling pressure tests on compacted bentonite specimens and on a bentonite/sand mixture was conducted to ensure an adequate potential for swelling-pressure development.The measurements under constant volume for dry densities between 1.45 g/cm3 and 1.67 g/cm3 showed an evolving swelling pressure between 1.04 and 1.8 MPa for 100% bentonite samples. Straincontrolled oedometer tests for zero strain and step-wise applied strain up to 2% revealed that a sufficient magnitude of swelling pressure existed at maximum applied strain.

scholarly journals Investigations on densified beech wood for application as a swelling dowel in timber joints

Holzforschung ◽  
2019 ◽  
Vol 73 (6) ◽  
pp. 559-568 ◽  
Author(s):  
Philippe Grönquist ◽  
Thomas Schnider ◽  
Andreas Thoma ◽  
Fabio Gramazio ◽  
Matthias Kohler ◽  
...  
Keyword(s):  
Beech Wood ◽  
Compressive Loading ◽  
Swelling Pressure ◽  
European Beech ◽  
Densified Wood ◽  
Robotic Fabrication ◽  
Recovery Capacity ◽  
Pressure Development ◽  
Multiple Cycles ◽  
Wooden Structures

AbstractFor robotic fabrication of wooden structures, the simple, quick and tight joining of elements can be solved using swelling hardwood dowels. This topic has been the focus of the present study, and the set-recovery capacity of densified wood (dW) as dowel material was investigated. European beech was compressed in the radial direction at 103°C and 10% moisture content (MC) to a compression ratio of 40%. Multiple swelling and shrinkage cycles were applied to measure swelling behavior, swelling pressure development and combined swelling and creep under compressive loading. It has been demonstrated that dW shows increased swelling and more persisting swelling pressures than native wood (nW). The set-recovery prevents significant contact-stress relaxation over multiple cycles of MC change. Application as a structural joining element for robotic fabrication was studied by shear lap joint tests on round double-dovetail swelling dowels.

scholarly journals Interpretation of the loading–wetting behaviour of compacted soils within the “MPK” framework. Part I: Static compaction

2016 ◽  
Vol 53 (5) ◽  
pp. 783-805 ◽  
Author(s):  
Tanvirul Islam ◽  
Jayantha Kodikara
Keyword(s):  
Moisture Content ◽  
Unsaturated Soils ◽  
Void Ratio ◽  
Swelling Pressure ◽  
The State ◽  
Moisture Ratio ◽  
Parameter Determination ◽  
Compacted Soils ◽  
Pressure Development ◽  
State Path

Depending on the state paths, loading–wetting of compacted unsaturated soils can exhibit complex volumetric behaviour, such as swelling, collapse, collapse followed by swelling, swelling followed by collapse, and swelling pressure development. Microscopically, these behaviours arise from complex interactions among applied stresses, air–water pressure deficit or suction at the water menisci, moisture content or degree of saturation in the voids, and the nature of the micro- and macrosoil aggregates of compacted soils that depend on the level of suction. While significant advances have been made in modelling hydromechanical behaviour of compacted unsaturated soils taking these interactions into account, input parameter determination requires advanced testing equipment and the testing processes can be very time-consuming. In 2012, a relatively simple and practical framework within the void ratio – moisture ratio (water volume / solid volume) – net stress space (referred to as the MPK framework) has been proposed by Kodikara to explain–predict these state paths. A desirable feature of this framework is that it identifies a direct link between the well-known compaction curve and the compacted soil constitutive behaviour. This paper presents a comprehensive series of tests on statically compacted soils, the results of which are in close agreement with this framework. Two soil types, namely lightly reactive kaolin and more reactive clay (referred to as Merri Creek soil), were used in the testing. The soils were prepared with different moisture contents from the dry state and statically compacted at constant water content to obtain void ratio – moisture ratio – net stress constitutive surfaces, as well as soil specimens for state path tests. The state path test results of yielding under loading, collapse under wetting, swelling pressure development, and change in yield pressure due to wetting are explained within this framework. In addition, some published data on a silty soil mixture were also analysed, highlighting that the framework is valid, regardless of the degree of reactivity of the soil. Suction was not measured in the authors’ experiments, as it was not required to explain the above state paths according to this framework. However, it is recognised that suction is the conjugate state variable to the moisture content. Therefore, in future experiments, suction will be measured and its role will be fully explained within the framework, adding more generality.

Investigation of the swelling pressure development during slow pyrolysis of thermoplastic coals

2005 ◽  
Vol 74 (1-2) ◽  
pp. 88-95 ◽  
Author(s):  
Vladimir Strezov ◽  
John A. Lucas ◽  
Les Strezov
Keyword(s):  
Swelling Pressure ◽  
Slow Pyrolysis ◽  
Pressure Development

scholarly journals Swelling pressure development and inter-aggregate porosity evolution upon hydration of a compacted swelling clay

2016 ◽  
Vol 124-125 ◽  
pp. 197-210 ◽  
Author(s):  
Luc Massat ◽  
Olivier Cuisinier ◽  
Isabelle Bihannic ◽  
Francis Claret ◽  
Manuel Pelletier ◽  
...  
Keyword(s):  
Swelling Pressure ◽  
Swelling Clay ◽  
Porosity Evolution ◽  
Pressure Development

scholarly journals The Messinian Salinity Crisis as a trigger for high pore pressure development in the Western Mediterranean

2021 ◽  
Author(s):  
Michael S. Dale ◽  
Héctor Marín‐Moreno ◽  
Ismael Himar Falcon‐Suarez ◽  
Carlos Grattoni ◽  
Jonathan M. Bull ◽  
...  
Keyword(s):  
Pore Pressure ◽  
Western Mediterranean ◽  
Messinian Salinity Crisis ◽  
Pressure Development

scholarly journals Modeling cesium migration through Opalinus clay: a benchmark for single- and multi-species sorption-diffusion models

2021 ◽  
Author(s):  
Jesús F. Águila ◽  
Vanessa Montoya ◽  
Javier Samper ◽  
Luis Montenegro ◽  
Georg Kosakowski ◽  
...  
Keyword(s):  
Time Discretization ◽  
Single Species ◽  
Opalinus Clay ◽  
Sorption Behavior ◽  
Diffusion Experiment ◽  
Modeling Tools ◽  
Cesium Sorption ◽  
Code Performance ◽  
Good Agreement

AbstractSophisticated modeling of the migration of sorbing radionuclides in compacted claystones is needed for supporting the safety analysis of deep geological repositories for radioactive waste, which requires robust modeling tools/codes. Here, a benchmark related to a long term laboratory scale diffusion experiment of cesium, a moderately sorbing radionuclide, through Opalinus clay is presented. The benchmark was performed with the following codes: CORE2DV5, Flotran, COMSOL Multiphysics, OpenGeoSys-GEM, MCOTAC and PHREEQC v.3. The migration setup was solved with two different conceptual models, i) a single-species model by using a look-up table for a cesium sorption isotherm and ii) a multi-species diffusion model including a complex mechanistic cesium sorption model. The calculations were performed for three different cesium boundary concentrations (10−3, 10−5, 10−7 mol / L) to investigate the models/codes capabilities taking into account the nonlinear sorption behavior of cesium. Generally, good agreement for both single- and multi-species benchmark concepts could be achieved, however, some discrepancies have been identified, especially near the boundaries, where code specific spatial (and time) discretization had to be improved to achieve better agreement at the expense of longer computation times. In addition, the benchmark exercise yielded useful information on code performance, setup options, input and output data management, and post processing options. Finally, the comparison of single-species and multi-species model concepts showed that the single-species approach yielded generally earlier breakthrough, because this approach accounts neither for cation exchange of Cs+ with K+ and Na+, nor K+ and Na+ diffusion in the pore water.

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