Application of Centrifugal Model Tests in the Preliminary Support of the Tunnel: A Review

2014 ◽  
Vol 1049-1050 ◽  
pp. 242-245
Author(s):  
Jun Ling Qiu ◽  
Jin Xing Lai
Keyword(s):  
Boundary Conditions ◽  
Stress Level ◽  
Future Development ◽  
Geotechnical Engineering ◽  
Model Tests ◽  
Structure Model ◽  
Related Research ◽  
Modeling Technology ◽  
Centrifugal Model ◽  
Preliminary Support

Centrifugal modeling technology has been applied to geotechnical engineering for more than half a century. It has been an important and indispensible means to simulate the geotechnical behavior because it has the same material, the similar boundary conditions and the same stress level. And it is also commonly used in tunnel-related research. Centrifugal tests of pipe-roof and small pipe grouting in tunnel were analyzed, the important effects of centrifugal tests on preliminary support of the tunnel were also emphasized. Problems often met in model tests of tunnelling were solved, such as structure model, modeling soil, preliminary support model and general programming of experiment proposal. The future development of centrifuges in tunnelling is also presented.

On Paleotectonic Stress Level Estimation of Geological Model

2013 ◽  
Vol 838-841 ◽  
pp. 1335-1338
Author(s):  
Chen Zhang ◽  
Hao Huang ◽  
Ning Wang ◽  
Sui Han Cheng
Keyword(s):  
Boundary Conditions ◽  
Stress Level ◽  
Geological Structure ◽  
Shanxi Province ◽  
Geological Model ◽  
Structure Model ◽  
Regional Tectonic ◽  
Structure Research

How to determine the stress level of the boundary conditions of the model is a key issue in the study of geological structure and paleostress field, which is of great significance for geological structure research. The paper takes Chengzhuang coal area in Jincheng of Shanxi Province as an example to analyze its geological structure model and study the method to determine the paleotectonic stress level so as to make a contribution to study of establishing regional tectonic models.

scholarly journals ENHANCING ASEISMIC STABILITY OF ROAD EMBANKMENT BY REINFORCING THE TOE WITH SOIL-BAG STRUCTURE – MODEL TESTS OF STACKING SOIL-BAG

2017 ◽  
Vol 32 (0) ◽  
pp. 175 ◽  
Author(s):  
Takayuki KUDA ◽  
Satoru SHIBUYA ◽  
Satsuki KATAOKA ◽  
Ryosuke TAJIMA ◽  
Yuki MORIYOSHI ◽  
...  
Keyword(s):  
Model Tests ◽  
Structure Model

scholarly journals Advanced Design of Packing and Cylinders for Hyper-Compressors for LDPE Production

2005 ◽  
Author(s):  
Enzo Giacomelli ◽  
Franco Graziani ◽  
Simone Pratesi ◽  
Giovanni Zonfrillo ◽  
Iacopo Giovannetti
Keyword(s):  
Boundary Conditions ◽  
Stress Level ◽  
Critical Points ◽  
External Factors ◽  
Simulation Approach ◽  
Interference Fit ◽  
Tie Rods ◽  
Complex Arrangement

The optimization of packing cup geometry is important for improving the reliability of hyper-compressors. The complex arrangement and the transmission of loads through the various components requires the use of FEA to properly determine the stress level. The need to reduce the sensitivity to external factors requires an investigation with more advanced simulations. The entire cylinder and associated components such as head flanges, cylinder chambers and tie rods, were modeled. This provided the characteristics of the interfaces and the boundary conditions necessary to simulate the packing cups. Considering the thickness, ring housing profile, lube-oil holes, mating surfaces, interference-fit and diameter make it possible to obtain the stresses at the most critical points. This new simulation approach shows the effect of the parameters that influence the stress level at critical points, thus optimizing the packing cup profile and its relevant features.

Stress-level effects in model tests on piles

1994 ◽  
Vol 31 (1) ◽  
pp. 28-41 ◽  
Author(s):  
William H. Craig ◽  
Suhail K. Sabagh
Keyword(s):  
Stress Level ◽  
Laboratory Experiments ◽  
Earth Pressure ◽  
Model Tests ◽  
Overburden Pressure ◽  
Centrifuge Model ◽  
Angle Of Friction ◽  
Lateral Earth Pressure ◽  
Widespread Belief ◽  
Centrifuge Model Tests

Results are presented from several series of centrifuge model tests of piles installed in beds of uniform dry sand. Using identical model geometries, but varying acceleration factors, the tests demonstrate quite clearly the nature and extent of stress-level variations on the performance of piles. The results are interpreted initially in terms of bearing capacity coefficients Nt and lateral earth pressure coefficients Ks, and subsequently in terms of angle of friction [Formula: see text], determined using available relationships. Controlled laboratory experiments with varying levels of overburden pressure around the piles indicated consistent reductions in Nt, and to a lesser extent in Ks. Quantitative interpretations in terms of angle of friction variations depend on selection from a range of empirical correlations available and have been made for two of those commonly used. Comparison of shaft loads in compression and extension confirms the widespread belief that there is a difference, which is found to vary quantitatively depending on the relative density. Key words : model tests, piles, sand, centrifuge, stress level.

Study on the Testing Auxiliary System of a Large Scale Centrifugal Shaker

2011 ◽  
Vol 368-373 ◽  
pp. 959-962
Author(s):  
Yong Zhi Wang ◽  
Xiao Ming Yuan ◽  
Rui Sun
Keyword(s):  
Data Acquisition ◽  
Large Scale ◽  
Image Acquisition ◽  
Model Tests ◽  
Auxiliary System ◽  
Basic Design ◽  
Data Acquisition Systems ◽  
Design Requirements ◽  
Centrifugal Model ◽  
And Function

By special advantages and progress of dynamic centrifugal model tests, construction and development of large scale centrifugal shakers are driven. As one subsystem of a large scale centrifugal shaker, the testing auxiliary system is used to data acquisition, image acquisition and model making. The perfect design and construction of a testing auxiliary system must give a guarantee for dynamic centrifugal model tests. This paper outlines the components and function of the testing auxiliary system of a large scale centrifugal shaker. The basic design requirements and critical techniques relevant to data acquisition systems, image acquisition systems and containers are analyzed according to the characteristics of dynamic centrifugal model tests on a large scale centrifugal shaker, meanwhile, some specific conception and design suggestions are proposed. The results can offer some references for design of the testing auxiliary system of a large scale centrifugal shaker.

J192015 Centrifugal Model Tests for Stability Evaluation of Lunar Sandbag Wall

2011 ◽  
Vol 2011 (0) ◽  
pp. _J192015-1-_J192015-5
Author(s):  
Daisuke INOUE ◽  
Yoshitaka YANAGIHARA ◽  
Hiroshi UENO ◽  
Shinichiro NISHIDA
Keyword(s):  
Model Tests ◽  
Stability Evaluation ◽  
Centrifugal Model

Cloud Storage and Security Technology in the Application of the Internet Things

2014 ◽  
Vol 533 ◽  
pp. 460-465
Author(s):  
Xiao Yang Liang ◽  
Lin Zhang
Keyword(s):  
Internet Of Things ◽  
Future Development ◽  
Cloud Storage ◽  
Development Trend ◽  
The Internet ◽  
Structure Model ◽  
Security Technology ◽  
Architecture Model ◽  
Key Technologies ◽  
Internet Environment

This paper proceeds as follow, the architecture model based on cloud storage and cloud storage of key technologies, from the availability, reliability and data sharing three aspects analysis the feasibility of the combination of cloud storage and Internet of things, cloud storage are discussed under the Internet environment facing security problems and the corresponding solutions and Internet of things under the environment of cloud storage platform structure model, and the cloud storage in the Internet of the future development trend is prospected.

Use of centrifugal model testing to assess slope stability

1978 ◽  
Vol 15 (1) ◽  
pp. 14-31 ◽  
Author(s):  
A. N. Schofield
Keyword(s):  
Heat Transfer ◽  
Slope Stability ◽  
Model Tests ◽  
Material Behaviour ◽  
Total Stress ◽  
End Effects ◽  
Soil Material ◽  
Reconstituted Soil ◽  
Centrifugal Model ◽  
Small Models

Centrifugal model tests increase total stress levels in small models made of natural or reconstituted soil, and allow direct observation of repeated failures. A novel use of a basket centrifuge is described in which slopes can be tested without end effects. When a series of models at various overconsolidation ratios was tested to failure the error in the safety factor predicted by a total stress analysis increased with the overconsolidation ratio. Other centrifuges are discussed and the advantage of large machines with balanced arms and swinging carriages are explained. Soil material behaviour discussed includes heat transfer and leaching. The paper concludes with a review of the present availability of and prospects for centrifugal model tests.

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