Liquefied soil pressures on vertical walls with adjacent embankments |
| |
| Authors: | M Okamura M Ishihara K Tamura |
| |
| Institution: | aDepartment of Civil and Environmental Engineering, Ehime University, 3 Bunkyo chou, Matsuyama 790-8577, Japan;bEarthquake Disaster Prevention Research Group, Public Works Research Institute, 1-6 Minamihara, Tsukuba 305-8516, Japan;cNational Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure and Transport, 1 Asahi, Tsukuba 305-0804, Japan |
| |
| Abstract: | Horizontal earth pressures on rigid vertical walls in liquefied soils have extensively been studied by many researchers for the level ground surface condition. In this paper, a series of centrifuge tests was conducted to investigate the effects of embankments resting on ground surfaces on the pressure on the rigid vertical walls. In the tests, earth pressures on the rigid walls were successfully measured with built-in earth pressure cells with small accelerometers attached on them. The earth pressure cells are capable of measuring both normal and shear stresses simultaneously with a good accuracy. It appears that dynamic component of the earth pressure of liquefied sand is in proportion to the acceleration of the rigid wall irrespective of amplitude and frequency of the input motion, and increases with increasing average embankment load. On the other hand, the residual component of the earth pressure is found to be well estimated from FEM assuming the liquefied soil as an incompressible elastic body. A practical formula of the earth pressures is established for the purpose of practical use.Another series of centrifuge tests was carried out on models with solidification or densification zones below embankment toes as a remedial countermeasure against liquefaction-induced embankment failure. It was found that the proposed formulae holds valid independently of the movement of walls as long as the liquefied soil behaves as a heavy fluid, and the countermeasure does not soften significantly. |
| |
| Keywords: | Centrifuge Earth pressure Liquefaction Rigid vertical wall |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
