The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform
Jubert Pineda - One of the best experts on this subject based on the ideXlab platform.
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foundation of a gravity dam on layered soft rock shear strength of bedding planes in laboratory and large in situ tests
Geotechnical and Geological Engineering, 2014Co-Authors: Eduardo Alonso, Núria M. Pinyol, Jubert PinedaAbstract:A 100 m high gravity dam (Castrovido dam, Burgos, Spain) is founded on a soft Weald red claystone with inter-bedded sandstone strata. Claystone weathering was identified in vertical and horizontal profiles of water content and dry density. Peak and residual strength of rock matrix is given in the paper. Clay and sandstone layers dip 15°–20° in the upstream direction. Dam stability is essentially controlled by the available shear strength at the sedimentation planes. Block samples were recovered for each of the contact types mentioned. They were tested in high capacity shear box machine (30 × 30 cm). In addition, large scale shear tests (80 × 80 cm) were performed in situ. The roughness of the sheared plane was determined after each one of the tests. Additional information includes some direct shear tests on joints recovered in borings and the results of residual strength tests performed on clay fillings on a ring shear apparatus. The results of all the tests performed are compared in the paper showing the effect of Shearing Surface roughness. In general, strength envelopes determined “in situ” exhibit a marked nonlinearity at the low range of confining stresses (0–0.2 MPa). Laboratory tests on smaller specimens show linear Mohr–Coulomb envelopes. Existing relationships between joint roughness and strength envelopes were also included in the comparison. The paper discusses the procedure followed to select an appropriate strength envelope for design purposes on the basis of all the available information. The case points out the difficulty to select unambiguously a suitable design strength for the critical sedimentation Surfaces despite the efforts displayed in the field and in the laboratory.
Núria M. Pinyol - One of the best experts on this subject based on the ideXlab platform.
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foundation of a gravity dam on layered soft rock shear strength of bedding planes in laboratory and large in situ tests
Geotechnical and Geological Engineering, 2014Co-Authors: Eduardo Alonso, Núria M. Pinyol, Jubert PinedaAbstract:A 100 m high gravity dam (Castrovido dam, Burgos, Spain) is founded on a soft Weald red claystone with inter-bedded sandstone strata. Claystone weathering was identified in vertical and horizontal profiles of water content and dry density. Peak and residual strength of rock matrix is given in the paper. Clay and sandstone layers dip 15°–20° in the upstream direction. Dam stability is essentially controlled by the available shear strength at the sedimentation planes. Block samples were recovered for each of the contact types mentioned. They were tested in high capacity shear box machine (30 × 30 cm). In addition, large scale shear tests (80 × 80 cm) were performed in situ. The roughness of the sheared plane was determined after each one of the tests. Additional information includes some direct shear tests on joints recovered in borings and the results of residual strength tests performed on clay fillings on a ring shear apparatus. The results of all the tests performed are compared in the paper showing the effect of Shearing Surface roughness. In general, strength envelopes determined “in situ” exhibit a marked nonlinearity at the low range of confining stresses (0–0.2 MPa). Laboratory tests on smaller specimens show linear Mohr–Coulomb envelopes. Existing relationships between joint roughness and strength envelopes were also included in the comparison. The paper discusses the procedure followed to select an appropriate strength envelope for design purposes on the basis of all the available information. The case points out the difficulty to select unambiguously a suitable design strength for the critical sedimentation Surfaces despite the efforts displayed in the field and in the laboratory.
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Canelles landslide: modelling rapid drawdown and fast potential sliding
Landslides, 2012Co-Authors: Núria M. Pinyol, Eduardo E. Alonso, Jordi Corominas, José MoyaAbstract:A large landslide (40 × 10^6 m^3) was reactivated on the left bank of Canelles reservoir, Spain. The instability was made evident after a considerable reduction of the reservoir level. The drawdown took place during the summer of 2006 after several years of high water levels. The drawdown velocity reached values between 0.5 and 1.2 m/day (registered at low elevations). The paper reports the geological and geotechnical investigations performed to define the movement. The geometry of the slip Surface was established from the detailed analysis of the continuous cores recovered in deep borings and from limited information provided by inclinometers. Deep piezometric records provided also valuable information on the pore water pressure in the vicinity of the failure Surface. These data allowed validating a flow–deformation coupled calculation model, which takes into account the changes in water level that occurred 4 years previous to the failure as well as the average rainfall. The analysis indicates that the most likely reason for the instability is the rapid drawdown that took place during the summer of 2006. The potential sudden acceleration of the slide is also analysed in the paper introducing coupled thermal hydraulic and mechanical effects that may develop at the basal Shearing Surface of the sliding mass. The results indicate that the slide velocity may reach values around 16 m/s when displacement reaches 250 m.
Eduardo Alonso - One of the best experts on this subject based on the ideXlab platform.
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foundation of a gravity dam on layered soft rock shear strength of bedding planes in laboratory and large in situ tests
Geotechnical and Geological Engineering, 2014Co-Authors: Eduardo Alonso, Núria M. Pinyol, Jubert PinedaAbstract:A 100 m high gravity dam (Castrovido dam, Burgos, Spain) is founded on a soft Weald red claystone with inter-bedded sandstone strata. Claystone weathering was identified in vertical and horizontal profiles of water content and dry density. Peak and residual strength of rock matrix is given in the paper. Clay and sandstone layers dip 15°–20° in the upstream direction. Dam stability is essentially controlled by the available shear strength at the sedimentation planes. Block samples were recovered for each of the contact types mentioned. They were tested in high capacity shear box machine (30 × 30 cm). In addition, large scale shear tests (80 × 80 cm) were performed in situ. The roughness of the sheared plane was determined after each one of the tests. Additional information includes some direct shear tests on joints recovered in borings and the results of residual strength tests performed on clay fillings on a ring shear apparatus. The results of all the tests performed are compared in the paper showing the effect of Shearing Surface roughness. In general, strength envelopes determined “in situ” exhibit a marked nonlinearity at the low range of confining stresses (0–0.2 MPa). Laboratory tests on smaller specimens show linear Mohr–Coulomb envelopes. Existing relationships between joint roughness and strength envelopes were also included in the comparison. The paper discusses the procedure followed to select an appropriate strength envelope for design purposes on the basis of all the available information. The case points out the difficulty to select unambiguously a suitable design strength for the critical sedimentation Surfaces despite the efforts displayed in the field and in the laboratory.
Chang Jing - One of the best experts on this subject based on the ideXlab platform.
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fractal description of the Shearing Surface of tools
International Journal of Plant Engineering and Management, 2004Co-Authors: Bingcheng Wang, Chang JingAbstract:In this paper, the basic methods are introduced to calculate the fractal dimensions of the Shearing Surface of some tools. The fractal dimension of the Shearing Surface of experimental sampling is obtained and the fractal characteristics are also discussed. We can apply the fractal method to identify types of tools used by burglars and to do the job of individual recognition. New theories and methods are provided to measure and process the Shearing Surface profile of tools.
Bingcheng Wang - One of the best experts on this subject based on the ideXlab platform.
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fractal description of the Shearing Surface of tools
International Journal of Plant Engineering and Management, 2004Co-Authors: Bingcheng Wang, Chang JingAbstract:In this paper, the basic methods are introduced to calculate the fractal dimensions of the Shearing Surface of some tools. The fractal dimension of the Shearing Surface of experimental sampling is obtained and the fractal characteristics are also discussed. We can apply the fractal method to identify types of tools used by burglars and to do the job of individual recognition. New theories and methods are provided to measure and process the Shearing Surface profile of tools.