Influence of Geomembrane Stiffness on the Integrity of Landfill Covers: Centrifuge Modelling

2018 ◽  
pp. 257-264
Author(s):  
P. V. Divya ◽  
B. V. S. Viswanadham ◽  
J. P. Gourc
Keyword(s):  
Centrifuge Modelling ◽  
Landfill Covers

Centrifuge modelling of wet deep mixing processes in soft clays

Géotechnique ◽  
2006 ◽  
Vol 56 (10) ◽  
pp. 677-691 ◽  
Author(s):  
F. H. Lee ◽  
C. H. Lee ◽  
G. R. Dasari
Keyword(s):  
Centrifuge Modelling ◽  
Mixing Processes ◽  
Soft Clays ◽  
Deep Mixing

scholarly journals Effects of dynamic fragmentation on the impact force exerted on rigid barrier: centrifuge modelling

2019 ◽  
Vol 56 (9) ◽  
pp. 1215-1224 ◽  
Author(s):  
C.W.W. Ng ◽  
C.E. Choi ◽  
D.K.H. Cheung ◽  
Y. Cui
Keyword(s):  
Volume Fraction ◽  
Impact Force ◽  
Inertial Particles ◽  
Size Segregation ◽  
Centrifuge Modelling ◽  
Rigid Barrier ◽  
Flow Energy ◽  
Dynamic Fragmentation ◽  
Large Particles ◽  
The Impact

Bi-dispersity is a prerequisite for grain-size segregation, which transports the largest particles to the flow front. These large and inertial particles can fragment upon impacting a barrier. The amount of fragmentation during impact strongly influences the force exerted on a rigid barrier. Centrifuge modelling was adopted to replicate the stresses for studying the effects of bi-dispersity in a granular assembly and dynamic fragmentation on the impact force exerted on a model rigid barrier. To study the effects of bi-dispersity, the ratio between the diameters of small and large particles (δs/δl), characterizing the particle-size distribution (PSD), was varied as 0.08, 0.26, and 0.56. The volume fraction of the large particles was kept constant. A δs/δl tending towards unity characterizes inertial flow that exerts sharp impulses, and a diminishing δs/δl characterizes the progressive attenuation of these sharp impulses by the small particles. Flows dominated by grain-contact stresses (δs/δl < 0.26), as characterized by the Savage number, are effective at attenuating dispersive stresses of the large particles, which are responsible for reducing dynamic fragmentation. By contrast, flows dominated by grain-inertial stresses (δs/δl > 0.26) exhibit up to 66% more impulses and 4.3 times more fragmentation. Dynamic fragmentation of bi-disperse flows impacting a rigid barrier can dissipate about 30% of the total flow energy.

Dynamic Centrifuge Modelling Tests for Sliding Rock Slopes

2014 ◽  
pp. 75-79 ◽  
Author(s):  
Xianglong Li ◽  
Joseph Wartman ◽  
Huiming Tang ◽  
Jinkai Yan ◽  
Hongming Luo ◽  
...  
Keyword(s):  
Rock Slopes ◽  
Centrifuge Modelling

Centrifuge modelling of heat-generating waste disposal

1989 ◽  
Vol 26 (4) ◽  
pp. 640-652 ◽  
Author(s):  
F. Poorooshasb ◽  
R. G. James
Keyword(s):  
Waste Disposal ◽  
Field Tests ◽  
Free Fall ◽  
Heat Emission ◽  
Centrifuge Modelling ◽  
Depth Of Penetration ◽  
Geotechnical Centrifuge ◽  
Pressure Changes ◽  
Deformation Patterns ◽  
Theoretical Analyses

A set of experiments, conducted on the Cambridge geotechnical centrifuge and which model the free-fall option for the subseabed disposal of heat-generating waste, is reported. The results reported relate to the morphological effects of model penetration (depth of penetration, deformation patterns, and closure) as well as to the pore pressure changes associated with this penetration. Results regarding the effect of heat emission (from the model penetrators) upon the surrounding soil are also presented. These results are discussed and compared with theoretical analyses and field tests, and conclusions are presented regarding both the processes attendant upon penetration and heating and the relevance of the modelling to the prototype event. Key words: centrifuge modelling, heat-generating waste disposal, projectile penetration.

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