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EPFL

1. Federspiel, Matteo Paolo Elia Antonio. Response of an Embedded Block Impacted by High-Velocity Jets.

Degree: 2011, EPFL

High-velocity plunging jets, issuing from ood release structures of dams, may result in scouring of the rocky riverbed and even endanger the foundation of the dams. Assessment of the scour extent is essential to ensure the safety of the dam and appurtenant structures as well as to guarantee the stability of its abutments. The existing near-prototype scaled experimental facility developed at the Laboratory of Hydraulic Constructions (LCH) of the Ecole Polytechnique Fédérale de Lausanne (EPFL) has been modified to study the complex interaction between pressures fluctuations acting inside a cylindrical plunge pool and inside a full interconnected 3-dimensional fissure. The present facility allows to simulate near-prototype jets in terms of velocity, turbulence and aeration. A movable highly instrumented block, simulating an "artificial rock block" founded in a fissured rock mass with one degree of freedom (along the vertical axis), has been inserted in the existing facility. The block and the measured box (new set-up), simulating the fissured rock mass, represent a sophisticated installation allowing to perform several measurements simultaneously. The block, having a cubic shape of 200 mm side and a density similar to in-situ rocks, is equipped with pressure, displacement and acceleration transducers. It is embedded in an artificially created surrounding rock mass equipped as well by pressure transducers. Between the block and the measurement box a 3-dimensional fissure of 1 mm thickness has also been created. The plunge pool and the new experimental set-up have been impacted by high-velocity jets to generate different loading conditions (core, transition or developed jets impacts). The purpose of the research project is to study the behavior of a single rock block separated from its surroundings by a 3-dimensional fissure and impacted by a high-velocity impinging water jet subjected to a natural aeration. Pressure fluctuations (pressure field) and block responses (displacements and accelerations) are recorded simultaneously for several jet impacts positions on the block upper face (at the plunge pool bottom level), for different water depths (Y/D ratio between 0 and 9.7) and near prototype jet velocities (2.5 - 27.0 m/s). The influence of the jet solicitations (symmetrical or asymmetrical jet impacts related to the block center) have been analyzed for several parameters: pressure field surrounding the block, dynamic block impulsion, natural and passive air entrainment, fissure geometries, block degree of freedom and block rotations in the fissured rock mass. The main conclusions coming from these analyses display interesting results. The pressure field acting on the block upper face follows the distribution found in literature (exponential… Advisors/Committee Members: Schleiss, Anton, Bollaert, Erik.

Subjects/Keywords: high-velocity water jets; plunge pool; fissured rock mass; 3-dimensional fissure; "artificial rock block"; scour phenomena; pressure fluctuations; block movements; dynamic block impulsion; added mass; air entrainment; fissure geometry; degree of freedom; jets d'eau à hautes vitesses; masse rocheuse fissurée; fissure tridimensionnelle; bloc de roche artificielle; érosion; fluctuations de pression; mouvement du bloc; impulsion du bloc; masse virtuelle (added mass); entrainement d'air; géométrie de la fissure; degré de liberté

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Federspiel, M. P. E. A. (2011). Response of an Embedded Block Impacted by High-Velocity Jets. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/167910

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Federspiel, Matteo Paolo Elia Antonio. “Response of an Embedded Block Impacted by High-Velocity Jets.” 2011. Thesis, EPFL. Accessed June 18, 2018. http://infoscience.epfl.ch/record/167910.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Federspiel, Matteo Paolo Elia Antonio. “Response of an Embedded Block Impacted by High-Velocity Jets.” 2011. Web. 18 Jun 2018.

Vancouver:

Federspiel MPEA. Response of an Embedded Block Impacted by High-Velocity Jets. [Internet] [Thesis]. EPFL; 2011. [cited 2018 Jun 18]. Available from: http://infoscience.epfl.ch/record/167910.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Federspiel MPEA. Response of an Embedded Block Impacted by High-Velocity Jets. [Thesis]. EPFL; 2011. Available from: http://infoscience.epfl.ch/record/167910

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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