Earthquake Engineering

M+EG provides geotechnical earthquake engineering design services for most of the local projects in the Lower Mainland of British Columbia.  M+EG is able to offer a range of services related to earthquake engineering, namely:

Seismic hazard review and assessment;

  • Evaluation of deaggregation results for selection of earthquake records to be used for the geotechnical and structural analyses;
  • Geotechnical cyclic and dynamic site characterization (including laboratory testing);
  • Site-specific seismic response analyses (1D, 2D and 3D equivalent linear and 1D and 2D non-linear analyses);
  • Evaluation of soil susceptibility to liquefaction;
  • Dynamic soil-structure interaction analyses;
  • 2D and 3D numerical modeling for seismic analyses;
  • Provision of spectrally-matched time history ground motions for structural analyses.
Some of the highlights in relation to earthquake engineering services are:
  • An earthquake record database has been developed to optimize the time for the selection and evaluation of the earthquake records to be used for the geotechnical and structural seismic analyses.
  • We are able to offer state-of-the-practice cyclic/dynamic testing of soil by means of resonant column and cyclic simple shear equipment through MEG Technical Services (MTS), a division of M+EG.  Resonant column test data can be combined with the cyclic DSS results to define the complete modulus degradation and damping curves for site-specific seismic response analysis (particularly important for deep soil sites).
  • M+EG is also able to perform numerical analyses using 2D or 3D models.  The 2D non-linear finite difference program FLAC or 3D equivalent-linear program SASSI are available and have been used for the modelling of both onshore and offshore structures.  In FLAC the UBCSand constitutive model is used to simulate the dynamic pore pressure generation under earthquake loading.  The UBCSand model can be calibrated with site-specific cyclic DSS results to provide site-specific realistic assessment of pore pressure generation and/or liquefaction, particularly important for granular soils with high fines contents and silt.