Flow slides run-out prediction using a sliding-consolidation model

Landslides ◽  
2013 ◽  
Vol 10 (6) ◽  
pp. 831-842 ◽  
Author(s):  
S. F. Qiao ◽  
C. R. I. Clayton
Keyword(s):  
Flow Slides ◽  
Consolidation Model

A sliding–consolidation model for flow slides

1986 ◽  
Vol 23 (2) ◽  
pp. 115-126 ◽  
Author(s):  
J. N. Hutchinson
Keyword(s):  
Fluid Pressure ◽  
Source Area ◽  
Pore Fluid ◽  
Flow Slide ◽  
South Wales ◽  
Metastable Structure ◽  
Flow Slides ◽  
Basal Sliding ◽  
Consolidation Model ◽  
Excess Pore

A model is proposed for the behaviour of flow slides in loose, cohesionless materials in which the debris spreads out as a uniform sheet. Excess pore-fluid pressures are assumed to be generated, for example by undrained loading arising from the collapse of metastable structure, in the source area of the flow slide. Under the influence of these, the leading element of the debris moves downslope by basal sliding, consolidating as it does so by single, upward drainage. As a result, the pore pressure at the base of the element eventually decays to a value that brings the element to rest, hence defining the run-out of the flow slide. The model is applicable, in principle, to subaqueous and subaerial flow slides and to pore fluids consisting of water, gas, or both of these. The predictions of the model are tested against the observed behaviour and measured properties of the 1966 flow slide at Aberfan, South Wales. The results show that a sliding–consolidation model provides a possible mechanism for that event. Key words: Cohesionless material, loose metastable structure, partial liquefaction, excess pore-fluid pressure, basal sliding, consolidation, flow slide, acceleration, velocity, run-out.

Dynamic consolidation of cubic boron nitride and its admixtures

1988 ◽  
Vol 3 (5) ◽  
pp. 1010-1020 ◽  
Author(s):  
Hua Tan ◽  
Thomas J. Ahrens
Keyword(s):  
Particle Size ◽  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Sem Analysis ◽  
Model Calculations ◽  
Boron Nitride Powder ◽  
Dynamic Consolidation ◽  
Consolidation Model ◽  
Heating Model ◽  
Hardness Values

Cubic boron nitride (C–BN)' powders admixed with graphite-structured boron nitride powder (g-DN), silicon carbide whisker (SCW), or silicon nitride whisker (SNW) were shock compacted to pressures up to 22 GPa. Unlike previous work with diamond and graphite [D. K. Potter and T. J. Ahrens, J. Appl. Phys. 63, 910 (1987) it was found that the addition of g-BN inhibited dynamic consolidation. Good consolidation was achieved with a 4–8 μm particle size C–BN powder admixed with 15 wt.% SNW or 20 wt.% SCW whereas a 37–44 μm particle size C–BN mixture was only poorly consolidated. Scanning electron microscopy (SEM) analysis demonstrates that SCW and SNW in the mixtures were highly deformed and indicated melt textures. A skin heating model was used to describe the physics of consolidation. Model calculations are consistent with SEM analysis images that indicate plastic deformation of SCW and SNW. Micro-Vickers hardness values as high as 50 GPa were obtained for consolidated C–BN and SNW mixtures. This compares to 21 GPa for single-crystal Al2O3 and 120 GPa for diamond.

An integrated cost and consolidation model for commingled yarn based composites

2002 ◽  
Vol 33 (4) ◽  
pp. 495-506 ◽  
Author(s):  
N. Bernet ◽  
M.D. Wakeman ◽  
P.-E. Bourban ◽  
J.-A.E. Månson
Keyword(s):  
Commingled Yarn ◽  
Consolidation Model ◽  
Integrated Cost

scholarly journals Modeling of Breaching-Generated Turbidity Currents Using Large Eddy Simulation

2020 ◽  
Vol 8 (9) ◽  
pp. 728
Author(s):  
Said Alhaddad ◽  
Lynyrd de Wit ◽  
Robert Jan Labeur ◽  
Wim Uijttewaal
Keyword(s):  
Experimental Data ◽  
Numerical Model ◽  
Large Eddy Simulation ◽  
Flow Characteristics ◽  
Turbidity Current ◽  
Turbidity Currents ◽  
Eddy Simulation ◽  
Failure Evolution ◽  
Large Eddy ◽  
Flow Slides

Breaching flow slides result in a turbidity current running over and directly interacting with the eroding, submarine slope surface, thereby promoting further sediment erosion. The investigation and understanding of this current are crucial, as it is the main parameter influencing the failure evolution and fate of sediment during the breaching phenomenon. In contrast to previous numerical studies dealing with this specific type of turbidity currents, we present a 3D numerical model that simulates the flow structure and hydrodynamics of breaching-generated turbidity currents. The turbulent behavior in the model is captured by large eddy simulation (LES). We present a set of numerical simulations that reproduce particular, previously published experimental results. Through these simulations, we show the validity, applicability, and advantage of the proposed numerical model for the investigation of the flow characteristics. The principal characteristics of the turbidity current are reproduced well, apart from the layer thickness. We also propose a breaching erosion model and validate it using the same series of experimental data. Quite good agreement is observed between the experimental data and the computed erosion rates. The numerical results confirm that breaching-generated turbidity currents are self-accelerating and indicate that they evolve in a self-similar manner.

Influence of Wave-Induced Uplift Forces on Upheaval Buckling of Pipelines Buried in Sandy Seabeds

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
D. Suresh Kumar ◽  
D. Achani ◽  
M. R. Sunny ◽  
T. Sahoo
Keyword(s):  
Gravity Waves ◽  
Shallow Waters ◽  
Burial Depth ◽  
Theoretical Studies ◽  
Wave Loads ◽  
Upheaval Buckling ◽  
Consolidation Model ◽  
Wave Induced ◽  
Uplift Forces ◽  
Experimental And Theoretical Studies

This study focuses on the buckling of pipelines in shallow waters subjected to surface gravity waves. The wave-induced uplift forces on pipelines buried in sandy seabeds are investigated using Biot's consolidation model. Empathetic imperfection model proposed by Taylor and Tran (1994, “Experimental and Theoretical Studies in Subsea Pipeline Buckling," Mar. Struct., 9(2), pp. 211–257.) is used for the study. Thereafter, buckling analyses are performed on the pipeline with the combined temperature and the wave-induced loads. The differences in the critical buckling temperatures for the pipe with consideration of wave loads are analyzed within a range of sea states. The influence of wave loads is found significant for low burial depth ratios.

scholarly journals A practical model to implementing IFRS in the national accounting system: The case of Azerbaijan

2021 ◽  
Vol 8 (4) ◽  
pp. 585-598
Author(s):  
Akif Valiyev ◽  
Arif Huseynov ◽  
Nushaba Gadimli ◽  
Ilham Huseynov ◽  
Abasov Elmar
Keyword(s):  
Financial Reporting ◽  
Methodological Approach ◽  
Accounting Standards ◽  
Accounting System ◽  
National Accounting ◽  
Financial Reporting Standards ◽  
Accounting Practice ◽  
Consolidation Model ◽  
Practical Model ◽  
Questionnaire Method

The purpose of this article is to develop a methodological approach to substantiating the effective consolidation model of national accounting standards (NAS) with International Financial Reporting Standards (IFRS) for Azerbaijan. Using the questionnaire method, the advantages, and obstructions of IFRS implementation in Azerbaijan have been assessed, depending on the practicing models of consolidation of NAS and IFRS. Using fuzzy sets made it possible to determine the levels of development of advantages and obstructions associated with the introduction of IFRS into national accounting practice in Azerbaijan. We determined the most effective model of consolidation of NAS and IFRS for the enterprises of Azerbaijan. The effectiveness of implementing models for the consolidation of NAS and IFRS has been assessed to provide a balance between advantages and destructive factors in the implementation of IFRS.

scholarly journals Conception of Geomagnetic Data Integrated Space

2019 ◽  
Vol 18 (2) ◽  
pp. 390-415
Author(s):  
Andrei Vorobev ◽  
Gulnara Vorobeva ◽  
Nafisa Yusupova
Keyword(s):  
Time Series ◽  
Relevant Information ◽  
Data Sets ◽  
Spatial Anisotropy ◽  
Automatic Integration ◽  
Final Sample ◽  
Geomagnetic Data ◽  
Consolidation Model ◽  
Discretization Step ◽  
Original Time

. As is known, today the problem of geomagnetic field and its variations parameters monitoring is solved mainly by a network of magnetic observatories and variational stations, but a significant obstacle in the processing and analysis of the data thus obtained, along with their spatial anisotropy, are omissions or reliable inconsistency with the established format. Heterogeneity and anomalousness of the data excludes (significantly complicates) the possibility of their automatic integration and the application of frequency analysis tools to them. Known solutions for the integration of heterogeneous geomagnetic data are mainly based on the consolidation model and only partially solve the problem. The resulting data sets, as a rule, do not meet the requirements for real-time information systems, may include outliers, and omissions in the time series of geomagnetic data are eliminated by excluding missing or anomalous values from the final sample, which can obviously lead to both to the loss of relevant information, violation of the discretization step, and to heterogeneity of the time series. The paper proposes an approach to creating an integrated space of geomagnetic data based on a combination of consolidation and federalization models, including preliminary processing of the original time series with an optionally available procedure for their recovery and verification, focused on the use of cloud computing technologies and hierarchical format and processing speed of large amounts of data and, as a result, providing users with better and more homogeneous data.

Sign in / Sign up

Export Citation Format

Share Document