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Advances Of Cone Penetration Testing In Earthquake Engineering Applications, Robb E.S. Moss, R. Moffat
Advances Of Cone Penetration Testing In Earthquake Engineering Applications, Robb E.S. Moss, R. Moffat
Civil and Environmental Engineering
The Cone Penetration Test (CPT), because of its precision, accuracy, and utility has been increasingly used in earthquake engineering applications in the last decade. This paper provides a brief survey of recent advances in applying the CPT to; liquefaction triggering, post-liquefaction deformations, cyclic failure of clays, dynamic slope stability, and seismic site response. In granular soils the continuous CPT measurements of tip and sleeve resistance are well correlated with the engineering properties of relative density and friction angle. In clay soils the CPT tip resistance is directly proportional to the undrained shear strength. CPT measurements are ideal for weak or …
Nonparametric Liquefaction Triggering And Postliquefaction Deformations, J. S. Yazdi, Robb Moss
Nonparametric Liquefaction Triggering And Postliquefaction Deformations, J. S. Yazdi, Robb Moss
Civil and Environmental Engineering
This study evaluates granular liquefaction triggering case-history data using a nonparametric approach. This approach assumes no functional form in the relationship between liquefied and nonliquefied cases as measured using cone penetration test (CPT) data. From a statistical perspective, this allows for an estimate of the threshold of liquefaction triggering unbiased by prior functional forms, and also provides a platform for testing existing published methods for accuracy and precision. The resulting threshold exhibits some unique trends, which are then interpreted based on postliquefaction deformation behavior. The range of postliquefaction deformations are differentiated into three zones: (1) large deformations associated with metastable …
Global Shear Wave Velocity Database For Probabilistic Assessment Of The Initiation Of Seismic-Soil Liquefaction, Robert Kayen, Raymond B. Seed, Robb E.S. Moss, Onder K. Cetin, Y. Tanaka, Kohji Tokimatsu
Global Shear Wave Velocity Database For Probabilistic Assessment Of The Initiation Of Seismic-Soil Liquefaction, Robert Kayen, Raymond B. Seed, Robb E.S. Moss, Onder K. Cetin, Y. Tanaka, Kohji Tokimatsu
Civil and Environmental Engineering
Engineering practitioners commonly use penetration-based methods (SPT & CPT) for assessment of seismic liquefaction triggering hazard. On the horizon, shear wave velocity (Vs) may offer engineers a third tool that is lower cost and provides more physically meaningful measurements. Development of the shear wave velocity liquefaction method has been hampered by a paucity of published velocity profiles; particularly in deeper soil deposits (>10m) and deposits subjected to high cyclic stress ratios (CSR > 0.3). A review of the literature reveals that most historic liquefaction sites fitting this depth and CSR criteria are located in Asia, though most of …