Dames & Moore

Description

This practice-oriented, cycle-counting liquefaction model consists of a linear-elastic perfectly-plastic Mohr-Coulomb model, coupled with an empirical pore pressure generation procedure. Excess pore pressure is generated in response to shear stress cycles, following the cyclic-stress approach of Seed and Idriss. However, the model differs from traditional applications of this approach, where excess pore pressures are computed after a dynamic analysis, as a post-processing step. Instead, the model updates pore pressures continuously during a dynamic analysis, with reduction of effective stresses and shear strengths during shaking. The model has been updated to reflect changes in the simplified procedure, including revised correction factors for initial static stresses and a new shape for the cyclic strength curve. Other modifications include an effective-stress dependent elastic shear modulus, and a switch that prevents shear strength from dropping to residual strength during shaking. Adaptation of the model to 3-D analyses is also discussed. The performance of the model is illustrated with an analysis of the well known Lower San Fernando Dam case history.

Keywords

  • effective stress
  • liquefaction
  • plastic

References

Dawson, E. M., and L. H. Mejia. "Updates to a Practice-Oriented Liquefaction Model." GeoCongress 2012, State of the Art and Practice in Geotechnical Engineering. ASCE, 2012.

Dames & Moore

UDM Version: 06/12/2013
Release Date: Mar 9, 2016

Category: Sand

Software: Download: Contact: Developer:

Latest News
  • Meet Our Summer Interns Itasca is pleased to welcome three graduate student summer interns to Minneapolis. They will be...
    Read More
  • New Itascans Itasca welcomes Amanda Schendel and Luis Wasserman to our team....
    Read More
  • A Celebration of 40+ Years Itasca celebrated its 40th anniversary in May, marking four decades of discovery, service, and family....
    Read More

Upcoming Events
26 Jun
ARMA 56th US Rock Mechanics / Geomechanics Symposium
The 56th US Rock Mechanics / Geomechanics Symposium covers all aspects of rock mechanics, geomechanics, and rock engineering. ... Read More
29 Jun
3rd International Discrete Fracture Network Engineering (DFNE) Conference
The third International Conference on Discrete Fracture Network Engineering (DFNE 2022) present the important advances that have occurr... Read More
16 Aug
RockEng 2022
The theme of RockEng22 is Canadian Strengths and Future Directions in Rock Mechanics.... Read More