La méthode convergence-confinement. Les contributions du Laboratoire de mécanique des solides (LMS)

2021 ◽  
pp. 3
Author(s):  
Marc Panet ◽  
Jean Sulem
Keyword(s):  
Deformation Plane

La méthode convergence-confinement permet de simuler le creusement d’un tunnel avec la mise en place d’un soutènement par un modèle de déformation plane. La connaissance de la convergence du massif au moment où le soutènement devient actif est une démarche essentielle pour l’application de la méthode. Celle-ci nécessite la détermination du profil longitudinal de déplacement (LDP), qui représente le déplacement radial à la paroi du tunnel en fonction de la distance au front. Dans cet article, nous rappelons les contributions importantes de Pierre Habib et de ses collègues du Laboratoire de mécanique des solides (LMS) dans le développement de la méthode, en particulier sur la prise en compte de l’influence de la pose d’un soutènement rigide près du front sur la courbe LDP.

scholarly journals GROUND WATER IN GRANITE ROCKS AND TECTONIC MODELS

1972 ◽  
Vol 3 (3) ◽  
pp. 111-129 ◽  
Author(s):  
INGEMAR LARSSON
Keyword(s):  
Ground Water ◽  
Systematic Study ◽  
The Other ◽  
High Yield ◽  
Rock Mechanic ◽  
Granite Rock ◽  
Other Hand ◽  
Uniaxial Testing ◽  
Granite Rocks ◽  
Deformation Plane

A systematic study has been carried out concerning ground water in faults and fractures in a granite rock and the results are compared with those of uniaxial testing of granite specimens in rock mechanic laboratories. Dikes of diabase intersect the granite and indicate the plane of deformation syntectonic to the dikes. A collection of the tectonic data from the granite is statistically treated and the tectonic picture of the area fits very well into the deformation plane, indicated by the intrusion (Jotnian). The faults and fractures of the granite are, according to their position in relation to the plane of deformation, hypothetically interpreted as tension and shear faults. The faults in shear position are supposed to be tight and have very little ground water. The tension faults, on the other hand, are supposed to be open and to be capable of a high yield of ground water. This hypothesis is tested by core-drillings, percussion drillings and test pumping.

STRUCTURAL ANALYSIS OF THE QUEENSWAY FOLDS, OTTAWA, CANADA

1967 ◽  
Vol 4 (2) ◽  
pp. 299-321 ◽  
Author(s):  
D. K. Norris
Keyword(s):  
Principal Stress ◽  
Field Data ◽  
Structural Unit ◽  
Maximum Principal Stress ◽  
Strike Slip ◽  
Stress Fields ◽  
Model Studies ◽  
Stress Directions ◽  
The One ◽  
Deformation Plane

The Queensway folds are an anticline–syncline pair in layered limestone and shale of the Ottawa Formation in the Ottawa – St. Lawrence Lowlands. They are parallel, flexural-slip folds with horizontal axes trending northwest, parallel to the surface trace of the Gloucester fault.Five principal fracture subpatterns were recognized in the fold-pair, caused by at least four geometrically distinct stress fields. The principal stress directions at failure for all five subpatterns coincided, moreover, with the three orthogonal fabric axes, and the maximum principal stress was either parallel or perpendicular to the fold axes and to the Gloucester fault.Slickenside striae on bedding and on fractures at an angle to bedding indicate two principal kinematic patterns in the fold-pair; the one arises from motion in the deformation plane as a consequence of the folding and the other from strike-slip motion perpendicular to that plane as a consequence of displacement on the Gloucester fault.Slickensides indicate that each bed was free to move relative to adjacent ones during folding and that the fundamental structural unit in flexural-slip folding is the bed. Model studies support the field data and indicate that the sense and magnitude of interbed slip in any structural position is dependent upon an integral of conditions throughout the fold-pair and that the fundamental fold unit is the anticline–syncline pair.

scholarly journals Shape ofΛhypernuclei in the (β,γ) deformation plane

2011 ◽  
Vol 83 (1) ◽  
Author(s):  
Myaing Thi Win ◽  
K. Hagino ◽  
T. Koike
Keyword(s):  
Deformation Plane

Strain Induced Precipitation in Model and Conventional Microalloyed Steels during Thermomechanical Processing

2005 ◽  
Vol 500-501 ◽  
pp. 139-146 ◽  
Author(s):  
R.M. Poths ◽  
Mark W. Rainforth ◽  
Eric J. Palmiere
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Thermomechanical Processing ◽  
Flow Behavior ◽  
Model Alloy ◽  
Microalloyed Steels ◽  
Deformation Substructure ◽  
Transmission Electron ◽  
Delay Times ◽  
Deformation Plane

The finishing rolling of microalloyed steels was simulated by double-deformation plane strain compression testing of both model and conventional steels microalloyed with Nb. The flow behavior following interpass delay times of 1-100s was related to the deformed microstructure, the deformation substructure and the strain-induced precipitation. Fe-30wt%Ni is clearly a good model alloy for conventional microalloyed steels, as similar results are observed for both materials. In addition, the location of fine strain-induced precipitates in relation to the deformation substructure can be determined directly using transmission electron microscopy.

Unloading Waves in a Plucked Hyperelastic String

1989 ◽  
Vol 56 (2) ◽  
pp. 459-465 ◽  
Author(s):  
J. L. Wegner ◽  
J. B. Haddow ◽  
R. J. Tait
Keyword(s):  
Finite Deformation ◽  
Strain Energy ◽  
Similarity Solutions ◽  
Plane Motion ◽  
Governing Equations ◽  
Energy Functions ◽  
Fixed End ◽  
Strain Energy Functions ◽  
Deformation Plane

The governing equations for the finite deformation plane motion of a hyperelastic string are obtained in conservation form. These equations and the corresponding jump relations are used to investigate the response of a symmetrically-plucked string when it is suddenly released. Similarity solutions, which are valid until the first reflection occurs at a fixed end, are obtained for two strain energy functions. Justification is given for the use of isothermal strain energy functions.

scholarly journals Shape Evolution of C Isotopes in (β, γ) Deformation Plane

2008 ◽  
Vol 120 (1) ◽  
pp. 129-142 ◽  
Author(s):  
Ying Zhang ◽  
Hiroyuki Sagawa ◽  
Daishi Yoshino ◽  
Kouichi Hagino ◽  
Jie Meng
Keyword(s):  
Shape Evolution ◽  
C Isotopes ◽  
Deformation Plane
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