![]() |
Computational & Technology Resources
an online resource for computational,
engineering & technology publications |
Civil-Comp Proceedings
ISSN 1759-3433 CCP: 73
PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON CIVIL AND STRUCTURAL ENGINEERING COMPUTING Edited by: B.H.V. Topping
Paper 118
Finite Element Predictions of the Dynamic Effects on an adjacent Structure A. Rouaiguia and I. Jefferson
Department of Civil and Structural Engineering, Nottingham Trent University, United Kingdom Full Bibliographic Reference for this paper
A. Rouaiguia, I. Jefferson, "Finite Element Predictions of the Dynamic Effects on an adjacent Structure", in B.H.V. Topping, (Editor), "Proceedings of the Eighth International Conference on Civil and Structural Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 118, 2001. doi:10.4203/ccp.73.118
Keywords: LUSAS, numerical analysis, dynamic compaction, soil behaviour, impacting pounder, peak particle velocity.
Summary
This paper describes numerical simulation study of dynamic compaction process
by using LUSAS
![]()
The analysis of soil behaviour is materially non-linear due to the plastic
deformation in the soil and exhibits boundary condition of nonlinearity due to its
contact with the pounder. An elasto-plastic (optimised) Von Mises model is used to
analyse the plasticity aspects of the pounder and elasto-plastic Mohr-Coulomb
model is used for the soil analysis. 2D slidelines are used to specify the contact
conditions between the base of the pounder and the top of the soil. Both the Mohr-
Coulomb and Von Mises models are available in the library of LUSAS
The variations of crater depth with drop height and drop mass shown that
significant increase of crater depth with increasing drop height and drop mass,
showing a direct linear relationship. As regards to the results described in reference
[2], it is worth noticing that the estimated maximum mass penetration was 310 mm
for the drop mass of 10 Mg, which was between the two values of 510 mm for the
force-time load solution and 260 mm for the rigid body impact load analysis. The
inverse scaled distance which is the square root of drop energy,
As a conclusion of these examples, it may be deduced that the crater depth due to dynamic compaction correlates well with pounder mass and drop height. It increases significantly as drop mass increases. The results confirmed some previous published data. Peak particle velocity (PPV) due to dynamic compaction attenuates with distance from drop point. As for comparison with the same distances but from different depths, higher values of peak particle velocities were found at the ground surface and decreasing with increasing depth. The curves of the peak particle velocity have oscillating forms. Under this investigation most of the peak velocity approaching a zero value at a distance of more than 20 metres from the symmetric axis of the pounder. It is hoped to substantiate this numerical analysis with to some fieldwork on dynamic compactions. Ultimately, it is hoped that the program will contribute to the basic understanding of complex field processes, and extend available design technologies. The result obtained from this numerical study can be compared to field and laboratory situations such as: estimation of the effects of drop mass, drop weight, peak particle velocity, and other factors related to soil characteristics. References
purchase the full-text of this paper (price £20)
go to the previous paper |
|