A Literature Review of Geotechnical Centrifuge Modeling with Particular Emphasis on Rock Mechanics

1988 ◽  
Author(s):  
P. G. Joseph ◽  
H. H. Einstein ◽  
R. V. Whitman
Keyword(s):  
Literature Review ◽  
Rock Mechanics ◽  
Centrifuge Modeling ◽  
Geotechnical Centrifuge

Evaluation of Dynamic Behavior of Pile Foundations for Interim Storage Facilities Through Geotechnical Centrifuge Tests

2002 ◽  
Author(s):  
Shizuo Tsurumaki ◽  
Hiroyuki Watanabe ◽  
Akira Tateishi ◽  
Kenichi Horikoshi ◽  
Shunichi Suzuki
Keyword(s):  
Dynamic Behavior ◽  
Experimental Studies ◽  
Centrifuge Modeling ◽  
Pile Foundations ◽  
Soil Conditions ◽  
Confining Stress ◽  
Geotechnical Centrifuge ◽  
Centrifuge Tests ◽  
Interim Storage ◽  
Storage Facilities

In Japan, there is a possibility that interim storage facilities for recycled nuclear fuel resources may be constructed on quaternary layers, rather than on hard rock. In such a case, the storage facilities need to be supported by pile foundations or spread foundations to meet the required safety level. The authors have conducted a series of experimental studies on the dynamic behavior of storage facilities supported by pile foundations. A centrifuge modeling technique was used to satisfy the required similitude between the reduced size model and the prototype. The centrifuge allows a high confining stress level equivalent to prototype deep soils to be generated (which is considered necessary for examining complex pile-soil interactions) as the soil strength and the deformation are highly dependent on the confining stress. The soil conditions were set at as experimental variables, and the results are compared. Since 2000, the Nuclear Power Engineering Corporation (NUPEC) has been conducting these research tests under the auspices on the Ministry of Economy, Trade and Industry of Japan.

Performance of micropiled raft in sand subjected to vertical concentrated load: centrifuge modeling

2015 ◽  
Vol 52 (1) ◽  
pp. 33-45 ◽  
Author(s):  
A.M. Alnuaim ◽  
H. El Naggar ◽  
M.H. El Naggar
Keyword(s):  
Contact Pressure ◽  
Bending Moment ◽  
Centrifuge Modeling ◽  
Design Parameters ◽  
Concentrated Load ◽  
Centrifuge Testing ◽  
Geotechnical Centrifuge ◽  
Piled Raft Foundation ◽  
Overall Performance ◽  
Important Design

Initial applications of micropiles have involved retrofitting foundations of existing buildings. In these applications, the overall performance of the micropiles–raft (MPR) foundation system is similar to a piled raft foundation where the load is transmitted through both the raft and micropiles. However, there is no guidance available regarding the performance of MPR foundations. In this study, geotechnical centrifuge testing was conducted to investigate the behavior of MPR foundations in sand and evaluate their performance characteristics. The study investigated the effect of raft flexibility on a number of important design parameters, including raft total and differential settlements, raft contact pressure, raft bending moment, and load sharing between the raft and micropiles. In addition, the use of micropiles as settlement reducers was investigated. The results showed that the micropiles carried 42%–59% of the applied load for the MPR configuration considered, which resulted in redistribution of the raft contact pressure. It was found that the Poulos–Davis–Randolph (PDR) method can be used to evaluate the performance of MPR systems with relatively stiff rafts; however, it is not applicable for MPR with flexible raft. A correction factor was proposed to account for the raft flexibility in the PDR method.

Deformation and Failure Characteristics of Embankment upon the Slope in Permafrost Area under Different Foundation Slope

2013 ◽  
Vol 353-356 ◽  
pp. 905-910
Author(s):  
Qian Su ◽  
Jun Jie Huang ◽  
Bao Liu ◽  
Yu Jie Li
Keyword(s):  
Failure Modes ◽  
Centrifuge Modeling ◽  
Experimental Conditions ◽  
Soil Layers ◽  
Deformation And Failure ◽  
Geotechnical Centrifuge ◽  
Gravity Load ◽  
Unstable Failure ◽  
Thawing Depth ◽  
The Stability

To investigate the effect of foundation slope on stability of embankment upon the slope in permafrost area, 3 groups of model tests with different foundation slope are designed using the mechanical similarity based on geotechnical centrifuge modeling, when the freezing-thawing depth of the embankment reaches the greatest. The results show that: (1) The foundation slope has effect on the stability of the embankment. The deformation mainly concentrates on the soil layers above the freezing-thawing interface, and the deformation mutation point takes place at the freezing-thawing interface. (2) According to fracture characteristics and failure severity of the embankment, failure modes can be divided into the cracking failure in shallow layer and in deep layer. (3) The cause of unstable failure is the deficiency of shear resistance strength of the weak belt, the soil layers above the freezing-thawing interface slips along the freezing-thawing interface under gravity load. (4) Under the experimental conditions, the critical value of the foundation slope influencing on the stability of the embankment is about 1:6 when the height of the slope embankment is 5.0 m.

Performance of micropiled raft in clay subjected to vertical concentrated load: centrifuge modeling

2015 ◽  
Vol 52 (12) ◽  
pp. 2017-2029 ◽  
Author(s):  
A.M. Alnuaim ◽  
M.H. El Naggar ◽  
H. El Naggar
Keyword(s):  
Contact Pressure ◽  
Applied Load ◽  
Bending Moment ◽  
Centrifuge Modeling ◽  
Performance Characteristics ◽  
Concentrated Load ◽  
Centrifuge Testing ◽  
Geotechnical Centrifuge ◽  
Piled Raft Foundation ◽  
Raft Foundation

The overall behavior of a micropiled raft foundation (MPR) system is similar to a piled raft foundation where the load is transferred by both the raft and micropiles. However, there is no guidance available regarding the design of MPRs or indication of their performance. In this study, geotechnical centrifuge testing was conducted to investigate the behavior of MPR foundations in clay and evaluate their performance characteristics. The study evaluated the performance of MPRs compared to the isolated raft in terms of raft total and differential settlements; raft contact pressure; raft bending moment; and load sharing between the raft and the micropiles. The results showed that for the MPR configuration considered in the study, the raft carried 48% of the applied load. It was found that the Poulos–Davis–Randolph (PDR) method can be used to evaluate the performance of MPR for preliminarily design purposes with approximately 17% error.

Modeling deformation behaviour of clay liners in a small centrifuge

2002 ◽  
Vol 39 (6) ◽  
pp. 1406-1418 ◽  
Author(s):  
B VS Viswanadham ◽  
K V Mahesh
Keyword(s):  
Solid Waste ◽  
Deformation Behaviour ◽  
Model Tests ◽  
Centrifuge Modeling ◽  
Waste Materials ◽  
Clay Liners ◽  
Overburden Pressure ◽  
Clay Liner ◽  
Geotechnical Centrifuge ◽  
Liner System

In modern solid waste landfills, liner systems are essential structural elements that ensure that waste materials are safely separated from the environment. Many liner systems have been developed and used over the past decade. Among impermeable layers, clay liners are regarded as one of the very significant components of liner system and are being used worldwide as a waste containment system in landfills. One of the failures associated with clay liners is the occurrence of nonuniform settlements, resulting from the sudden collapse of waste, or the decomposition of waste materials, and (or) the subgrade over which the liner is laid. This paper deals with the use of a small centrifuge to model the deformation behaviour of clay liners. Model tests were performed in a small geotechnical centrifuge to investigate the behaviour of clay liners in landfills subjected to nonuniform settlements at sharp curvatures. A parametric study was conducted to analyze the influence of parameters like thickness, consistency, and overburden on the behaviour of clay liners. The clay liner without any overburden is observed to experience severe cracking in the form of deep and wide cracks at the maximum curvature zone. The depth and width of the cracks are found to decrease with an increase in clay liner thickness. The cracking failure pattern is suppressed by shearing for a clay liner with an increase in overburden pressure. Based on model test results, the clay liner with an adequate overburden is found to be free from cracking failure even when subjected to sharp curvatures. The effective usage of a small geotechnical centrifuge to model the deformation behaviour of clay liners is demonstrated adequately.Key words: landfills, municipal solid waste, clay liners, centrifuge modeling, nonuniform settlements, model tests.

scholarly journals Centrifuge modeling of one-step outflow tests for unsaturated parameter estimations

2006 ◽  
Vol 10 (5) ◽  
pp. 715-729 ◽  
Author(s):  
H. Nakajima ◽  
A. T. Stadler
Keyword(s):  
Pore Water ◽  
Input Data ◽  
Scaling Laws ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Centrifuge Modeling ◽  
Testing Time ◽  
Gravity Level ◽  
Geotechnical Centrifuge ◽  
One Step

Abstract. Centrifuge modeling of one-step outflow tests were carried out using a 2-m radius geotechnical centrifuge, and the cumulative outflow and transient pore water pressure were measured during the tests at multiple gravity levels. Based on the scaling laws of centrifuge modeling, the measurements generally showed reasonable agreement with prototype data calculated from forward simulations with input parameters determined from standard laboratory tests. The parameter optimizations were examined for three different combinations of input data sets using the test measurements. Within the gravity level examined in this study up to 40g, the optimized unsaturated parameters compared well when accurate pore water pressure measurements were included along with cumulative outflow as input data. With its capability to implement variety of instrumentations under well controlled initial and boundary conditions and to shorten testing time, the centrifuge modeling technique is attractive as an alternative experimental method that provides more freedom to set inverse problem conditions for the parameter estimation.

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