Pierre Delage
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View article: Poromechanical Behavior of a Deep Shale Core for Geological Radioactive Waste Storage
Poromechanical Behavior of a Deep Shale Core for Geological Radioactive Waste Storage Open
In the context of deep geological radioactive waste disposal in Switzerland, this study investigates the hydromechanical behavior of Opalinus Clay from a borehole in Northern Switzerland at around 800 m depth. Laboratory experiments includ…
View article: An Experimental Study of the Influence of Particle Size Heterogeneity on Seismic Wave Velocities
An Experimental Study of the Influence of Particle Size Heterogeneity on Seismic Wave Velocities Open
International audience
View article: An experimental study of the influence of regolith micro-structure on seismic wave velocities
An experimental study of the influence of regolith micro-structure on seismic wave velocities Open
Introduction:Determining the seismic wave velocity in a given soil is of great value in the study of its elastic properties, and to establish a coherent sub-surface model. This non-destructive technique is widely used in both geotechnical …
View article: Effects of hyperalkaline solutions on the water retention properties and microstructure of the opalinus clay from the lower sandy facies of mont terri site, Switzerland
Effects of hyperalkaline solutions on the water retention properties and microstructure of the opalinus clay from the lower sandy facies of mont terri site, Switzerland Open
International audience
View article: Investigating the Martian soil at the InSight landing site
Investigating the Martian soil at the InSight landing site Open
The InSight mission is a geophysical mission aimed at better understanding the structure of Mars and of the other rocky planets of the solar system. To do so, a lander accommodating two cameras, a very sensitive seismometer, and a dynamic …
View article: Wave Velocities and Poisson Ratio in a Loose Sandy Martian Regolith Simulant Under Low Stresses: 2. Theoretical Analysis
Wave Velocities and Poisson Ratio in a Loose Sandy Martian Regolith Simulant Under Low Stresses: 2. Theoretical Analysis Open
This paper presents a theoretical analysis of the data on wave velocity measurements at small stresses presented in a companion paper describing the experimental results on a Martian regolith loose sandy simulant (Fontainebleau sand) of th…
View article: Wave Velocities and Poisson Ratio in a Loose Sandy Martian Regolith Simulant Under Low Stresses: 1. Laboratory Investigation
Wave Velocities and Poisson Ratio in a Loose Sandy Martian Regolith Simulant Under Low Stresses: 1. Laboratory Investigation Open
Wave velocity measurements were performed on Fontainebleau sand samples used as a Martian regolith simulant to investigate the elastic properties of the surface material at the InSight landing site on Mars (Elysium Planitia). Loose samples…
View article: Dynamic Mechanical Analysis Test for Evaluating Loose Sands on a Wide Strain Range—Application to the InSight Mission on Mars
Dynamic Mechanical Analysis Test for Evaluating Loose Sands on a Wide Strain Range—Application to the InSight Mission on Mars Open
The dynamic properties of loose sands under low stresses are an unexplored topic in soil dynamics because these soil conditions are uncommon in most geotechnical structures on Earth. However, low densities and low-stress conditions prevail…
View article: Investigation of the self-sealing of Opalinus Clay from the lower sandy facies of Mont Terri site by mock-up tests with highly saline and alkaline solutions
Investigation of the self-sealing of Opalinus Clay from the lower sandy facies of Mont Terri site by mock-up tests with highly saline and alkaline solutions Open
Three small-scale mock-up tests were carried out on artificially fractured Opalinus Clay samples from the lower sandy facies of Mont Terri site: the first with the synthetic water of neutral pH and at an osmotic suction of 1 MPa, the secon…
View article: Using Wind Dispersion Effects During the InSight Tether Burial Activities to Better Constrain the Regolith Grain Size Distribution
Using Wind Dispersion Effects During the InSight Tether Burial Activities to Better Constrain the Regolith Grain Size Distribution Open
In an attempt to improve the quality of the seismic signals provided by the seismometer of the InSight mission ( In terior Exploration using S eismic I nvestigations, G eodesy and H eat T ransport) on Mars, part of the tether linking the s…
View article: Results from InSight Robotic Arm Activities
Results from InSight Robotic Arm Activities Open
The InSight lander carried an Instrument Deployment System (IDS) that included an Instrument Deployment Arm (IDA), scoop, five finger “claw” grapple, forearm-mounted Instrument Deployment Camera (IDC) requiring arm motion to image a target…
View article: Impact of salinity and alkalinity on the microstructure of partially saturated Opalinus Clay from the lower sandy facies (LSF) of Mont Terri site
Impact of salinity and alkalinity on the microstructure of partially saturated Opalinus Clay from the lower sandy facies (LSF) of Mont Terri site Open
In the context of deep waste disposals, the geological barrier (i.e., the host rock) will be exposed to saline plumes from bituminous waste and alkaline plumes from concrete degradation. These chemical disturbances will affect the hydrauli…
View article: Coupled stress-suction changes in the Callovo-Oxfordian claystone
Coupled stress-suction changes in the Callovo-Oxfordian claystone Open
Some (saturated) claystones, considered as host rocks for deep radioactive waste disposal, are sensitive to drying and wetting. Wetting may result in swelling and damage during the resaturation of specimens for mechanical testing. Given th…
View article: Suction in shales: consequences on triaxial testing
Suction in shales: consequences on triaxial testing Open
Significant interest has been devoted to claystones and shales in the context of geological radioactive waste disposal at great depth. The determination of their mechanical properties is needed for appropriate design of the underground gal…
View article: The mechanical properties of the Martian soil at the InSight landing site
The mechanical properties of the Martian soil at the InSight landing site Open
The InSight mission is a NASA geophysical mission aimed at better understanding the structure of Mars and of the other rocky plan-ets of the solar system. To do so, various instruments are used, including a very sensitive seismometer (SEIS…
View article: The interaction between the SEIS seismometer of the InSight Martian mission and a regolith simulant
The interaction between the SEIS seismometer of the InSight Martian mission and a regolith simulant Open
A detailed investigation has been conducted of the interaction between a Martian regolith simulant and the foot of a seismometer (SEIS) recently deployed on the surface of Mars within the NASA InSight mission. A specific device used to inv…
View article: Pore changes in an illitic clay during one-dimensional compression
Pore changes in an illitic clay during one-dimensional compression Open
The pore size, shape and orientation of an illite-dominant clay were mapped during one-dimensional compression, using mercury intrusion porosimetry (MIP), scanning electron microscopy and gas adsorption. The total porosity was found to spr…
View article: The InSight HP$^3$ Penetrator (Mole) on Mars: Soil Properties Derived From the Penetration Attempts and Related Activities
The InSight HP$^3$ Penetrator (Mole) on Mars: Soil Properties Derived From the Penetration Attempts and Related Activities Open
The NASA InSight Lander on Mars includes the Heat Flow and Physical Properties Package HP$^3$ to measure the surface heat flow of the planet. The package uses temperature sensors that would have been brought to the target depth of 3--5 m b…
View article: Relationships Among Regolith Thermal Conductivities and Seismic Velocities: Application to InSight Studies
Relationships Among Regolith Thermal Conductivities and Seismic Velocities: Application to InSight Studies Open
Studies of the thermal and seismic properties of planetary regoliths are complex because of uncertainties and variability in composition, particle and pore geometrical shape, size distribution, and three-dimensional physical connectivity. …
View article: Constitutive modeling of chalk – application to waterflooding
Constitutive modeling of chalk – application to waterflooding Open
Subsidence of chalk oil reservoirs in North Sea is related to the chalk compaction induced by fluid depletion and by the water – chalk interaction. A constitutive model is developed in order to take into account these two effects. It is ba…
View article: A New Fractal Approach to Account for Capillary and Adsorption Phenomena in the Water Retention and Transfer Properties of Unsaturated Soils
A New Fractal Approach to Account for Capillary and Adsorption Phenomena in the Water Retention and Transfer Properties of Unsaturated Soils Open
To describe the water retention and transfer properties of an unsaturated soil over the whole range of matric suction, it is necessary to account for both capillary and adsorption phenomena. Existing models combine well‐known empirical fun…
View article: Discussion on the separation of macropores and micropores in a compacted expansive clay
Discussion on the separation of macropores and micropores in a compacted expansive clay Open
The behaviour of clayey soils is strongly correlated to their microstructure and evolution thereof. Microstructural investigations have contributed to understanding soil behaviour and have supported the development of multi-scale coupled m…
View article: Subsurface Structure at the InSight Landing Site From Compliance Measurements by Seismic and Meteorological Experiments
Subsurface Structure at the InSight Landing Site From Compliance Measurements by Seismic and Meteorological Experiments Open
Measurements of ground compliance at the InSight landing site—describing the surface response to pressure loading—are obtained from seismic and meteorological data. Compliance observations show an increase with frequency indicating the pre…