{"id":103593,"date":"2018-03-11T10:26:12","date_gmt":"2018-03-11T10:26:12","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/landslides-in-reservoirs-a-coupled-thermo-hydromechanical-approach\/"},"modified":"2018-03-11T10:26:12","modified_gmt":"2018-03-11T10:26:12","slug":"landslides-in-reservoirs-a-coupled-thermo-hydromechanical-approach","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/politecnica-de-catalunya\/landslides-in-reservoirs-a-coupled-thermo-hydromechanical-approach\/","title":{"rendered":"Landslides in reservoirs. a coupled thermo-hydromechanical approach"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Nuria Merce Pinyol Puigmarti <\/strong><\/h2>\n<p>Landsliding is an important problem when facing the design, construction and  operation of dams and reservoirs. Impoundment of the slope toes as well as the rapid  drawdown may trigger the movement of first-time landslides or reactivate ancient  landslides often located in reservoir sites. This thesis deals with the particular case of  landslides around reservoirs defined as a mobilized mass that slides on a well-defined  shearing surface without experiencing a major degradation.   in the first part of the thesis the mechanism of rapid drawdown is discussed as a  fully coupled flow-deformation problem for saturated\/unsaturated conditions.   additional risk appears when landslide accelerates and is able to enter the reservoir  at high speed creating impulsive waves. The discussion on the different phenomena  leading to the fast acceleration is today  very active. Probably the lack of well- documented cases makes the advancement of knowledge difficult. The mechanism to  explain the rapid acceleration of landslides favoured in this thesis is based on thermal  effects on the sliding surface that induce the generation of pore water pressure and  therefore, the reduction of the frictional strength. The governing equations (mass and  heat balance equations and constitutive equations) formulated in the shear band have  been written and integrated together with  the motion equation of  the slide. With the  aim of finding practical criteria to decide  the actual risk of slide acceleration due the  phenomena analysed, a closed-form solution has been obtained for the case of planar  landslides under the hypothesis of incompressible water, solid particles and porous  media. For a rational range of the most relevant parameters, comparison between  analytical and numerical (relaxing the assumptions introduced in the analytical  development) solutions shows a remarkable similarity and reveals that the closed-form  solution is accurate enough for practical applications.   the thermo-hydro-mechanical approach discussed is applied in the case of vaiont  landslide. The stability of this landslide before the failure is first discussed by means of  a simple explanation introducing the internal strength of the mobilized rock. The  analysis is consistent with the available data (slide geometry, residual strength, material  properties and laboratory tests). When the  self-feeding mechanism of pore pressure  generation due to heat resulting from the frictional work is introduced in the dynamic  analysis of the vaiont model, the high velocity actually observed is predicted.   sensitivity and scale analysis have been performed for the case of a planar landslide  and for the geometry of vaiont. Three parameters have been found important to  explain the acceleration of the motion:  the thickness of the shearing band, its  permeability and its stiffness. In fact, permeability and thickness can be related since  both depend on the particle size distribution. Calculated results indicate that the  permeability of the shear band is a key  parameter. A threshold of permeability  established around 10-8 to 10-10 m\/s marks the transition for a potentially risky slide  (when the permeability is lower) to a safe one (for higher values of permeability).   for very large landslides, critical combinations of band permeability and band  thickness result in a substantial increase in  temperature. At high calculated values of  temperature (hundreds or even thousands of \u00c2\u00bac), the analysis presented is not  applicable. Evaporation or advance constitutive equations including rock melting  should be included.   in a final chapter a recent large landslide  located in canelles reservoir is analyzed.  the slide is regarded as a potential risk for the operation of the dam and the reservoir.  some of the developments made in the thesis, namely the solution of rapid drawdown  and the thermal coupled model for fast landsliding, are applied to canelles. The  chapter describes the methodology adopted which can be applied in similar cases.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Landslides in reservoirs. a coupled thermo-hydromechanical approach<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Landslides in reservoirs. a coupled thermo-hydromechanical approach <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Nuria Merce Pinyol Puigmarti <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 13\/09\/2010<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Eduardo Alonso P\u00e9rez De \u00e1greda<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: sebasti\u00ed\u00a0 Olivella pastall\u00e9 <\/li>\n<li>claudio Olalla mara\u00f1on (vocal)<\/li>\n<li>luciano Picarelli (vocal)<\/li>\n<li>Antonio Soriano pe\u00f1a (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Nuria Merce Pinyol Puigmarti Landsliding is an important problem when facing the design, construction and operation of 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