Narrow Results

For ensuring the earth dam's stability of Wangqingtuo reservoir when silt liquefaction happens during Tangshan earthquake, a large amount of laboratory soil tests and field measurements have been performed to obtain the mechanic properties of the soil and silt dynamic parameters. On the basis of the soil tests, the equivalent linear constitutive model is employed in the dynamic numerical simulation of the typical dam and the results indicate that the shear deformation is induced by the foundation liquefaction with the help of the geo-slope software. Moreover, the stability analysis is performed using the finite element elasto-plastic model that is considered the Mohr-Coulomb failure criteria to calculate the stability factor. The factors indicate the local instability would take place because of the shear action. At last, the measures are introduced to the designers for preventing the dam from the instability.

The remediation of Sardis Dam in Mississippi to prevent potential sliding upstream along a thin liquefiable layer in the foundation is described. The upstream slope of the embankment was stabilised by nailing it to stable foundation soils using prestressed concrete piles with 0.6 m² cross-section. This was an innovative and unusual solution in addition to being cost-effective. The paper explains how the moments and shears for design of the piles were obtained. The analytical procedures developed for this project have since been used on several dams with similar problems.

For ensuring the earth dam's stability of Wangqingtuo reservoir when silt liquefaction happens during Tangshan earthquake, a large amount of laboratory soil tests and field measurements have been performed to obtain the mechanic properties of the soil and silt dynamic parameters. On the basis of the soil tests, the equivalent linear constitutive model is employed in the dynamic numerical simulation of the typical dam and the results indicate that the shear deformation is induced by the foundation liquefaction with the help of the geo-slope software. Moreover, the stability analysis is performed using the finite element elasto-plastic model that is considered the Mohr-Coulomb failure criteria to calculate the stability factor. The factors indicate the local instability would take place because of the shear action. At last, the measures are introduced to the designers for preventing the dam from the instability.

The aim of this investigation is to study the dynamic behavior of the Moshampa earth dam (Iran), considering dam-foundation interaction, under normalized Manjil earthquake as input motion. In order to assess the effect of the foundation widths in the finite element model on the earthquake response, various dam-foundation coupled models are analyzed by Plaxis, a finite element package for solving geotechnical problems. The results indicate considerable differences in the seismic responses.