Journal ArticleDOI
Undrained dynamic-loading ring-shear apparatus and its application to landslide dynamics
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TLDR
A series of different types of ring-shear apparatus (DPRI-3, 4, 5, 6, 7) have been developed from 1992 to the present to simulate the formation of the shear zone and the following long and rapid shear displacement that occurs in high-velocity landslides.Abstract:
Landslides are gravitational mass movements of rock, debris or earth. Some move very slowly, thus conforming to the field of statics, but some move rapidly. Study of the initiation and motion of rapid landslides needs to develop “Landslide Dynamics” involving dynamic loading and dynamic generation/dissipation of excess pore-water pressure. New developments in science can be facilitated by new technological advances. This study aimed to develop a new apparatus that can geotechnically simulate the formation of the shear zone and the following long and rapid shear displacement that occurs in high-velocity landslides. Professor K. Sassa and his colleagues at DPRI (Disaster Prevention Research Institute), Kyoto University, have worked to develop an undrained dynamic-loading ring-shear apparatus for this purpose. A series of different types of apparatus (DPRI-3, 4, 5, 6, 7) have been developed from 1992 to the present. This paper describes the development of this apparatus and its application to the study of earthquake-induced landslides and the latest landslide-triggered debris flow in Japan. Also, tests of the latest version (DPRI-7) with a transparent shear box for direct observation of the shear zone during a rapid shearing are described.read more
Citations
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Regulation of landslide motion by dilatancy and pore pressure feedback
TL;DR: In this paper, a model of landslide motion is proposed to determine the feedback due to coupling between landslide motion, shear zone volume change, and pore pressure change, which depends on a single dimensionless parameter α, which, in turn, depends on the dilatancy angle ψ and the intrinsic timescales for porepressure generation and dissipation.
Journal ArticleDOI
An integrated model simulating the initiation and motion of earthquake and rain induced rapid landslides and its application to the 2006 Leyte landslide
TL;DR: In this article, a new computer simulation integrating the initiation process triggered by rainfalls and/or earthquakes and the development process to a rapid motion due to strength reduction and the entrainment of deposits in the runout path is presented.
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Distribution and characteristics of landslide in Loess Plateau: A case study in Shaanxi province
TL;DR: In this article, Wang et al. found that 79% of the landslides are shallower than 10m, 85% have a volume of less than 100,000m3, and the equivalent coefficient of friction of loess landslides is very low resulting in long run-out with a low angle sliding surface.
Journal ArticleDOI
Undrained shear behavior of loess saturated with different concentrations of sodium chloride solution
TL;DR: A series of ring-shear tests was conducted on saturated loess to investigate the effects of NaCl concentration in pore water and desalinization on the shear behavior under undrained conditions.
Journal ArticleDOI
A New Ring Shear Device to Measure the Large Displacement Shearing Behavior of Sands
TL;DR: In this paper, a new ring shear was constructed at the University of Illinois that has large specimen dimensions to reduce stress and strain nonuniformities, has auxiliary load and torque cells to measure any wall friction that develops along the confining rings, and utilizes quad-rings along the contining rings to prevent soil extrusion.
References
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Journal ArticleDOI
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TL;DR: In this article, two aspects of seismically-induced liquefaction are discussed which are of vital engineering significance: the triggering condition and the consequences of liquidation, and the evaluation of residual strength requires a better understanding of undrained sand behaviour.
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A New Ring Shear Apparatus and Its Application to the Measurement of Residual Strength
TL;DR: In this paper, the authors describe both the design and principles of operation of a new ring shear apparatus, and its application to the measurement of the residual strength of undisturbed and remoulded samples.
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Stresses developed by dry cohesionless granular materials sheared in an annular shear cell
Stuart B. Savage,M. Sayed +1 more
TL;DR: In this paper, the results obtained during rapid shearing of several dry, coarse, granular materials in an annular shear cell were described, and the main purpose of the tests was to obtain information that could be used to guide the theoretical development of constitutive equations suitable for the rapid flow of cohesionless bulk solids at low stress levels.
Journal ArticleDOI
A new attenuation relation for peak horizontal acceleration of strong earthquake ground motion in Japan
TL;DR: In this paper, a new attenuation relation for peak horizontal acceleration applicable to the near source region in Japan is developed, which is based on general nonstratified multiple regression analyses.
Stability of slopes
TL;DR: In this paper, the authors consider the forms of slope instability, including the evolution of natural slopes, and the behaviour of soil and rocks, and flow of water through them, are explained in detail.