Speaker: Prof. Kyle M. Rollins
Affiliation: Brigham Young University
C&EE 200 Section 1 Seminar
Structural, Geotechnical and Civil Engineering Materials
Probabilistic Liquefaction Triggering Curves for Gravels Based on Dynamic Cone Penetration Testing
Prof. Kyle M. Rollins
Civil & Environmental Engineering Department, Brigham Young University
The dynamic cone penetration test (DPT) developed in China has been correlated with liquefaction resistance in gravelly soils based on field performance data from the Mw7.9 Wenchuan, China earthquake. The DPT consists of a 74 mm diameter cone tip driven by a 120 kg hammer with a free fall height of 1 m. To expand the data base, DPT soundings were initially performed at the Pence Ranch, Larter Ranch and Whiskey Springs sites where gravelly soil liquefied during the 1983 Mw6.9 Borah Peak earthquake. DPT testing was performed using an automatic hammer with the energy specified in the Chinese standard and with an SPT hammer. In general, comparisons suggest that standard energy corrections developed for the SPT can be used for the DPT. The DPT correctly predicted liquefaction and non-liquefaction at these three test sites. Liquefaction resistance from the DPT (30% probability) also correlated reasonably well with that from Becker penetration testing (BPT). Subsequently, DPT testing has been performed at sites in New Zealand, Greece, Ecuador, Italy, Japan, and Alaska where gravels have also liquefied. These data points have been used to develop improved probabilistic liquefaction triggering curves which consider variations in earthquake magnitude.
Where: A18 Haines Hall
When: 12:00 – 12:50 PM, Tuesday, February 20, 2019
Kyle Rollins received his BS degree from Brigham Young University and his Ph.D. from the University of California at Berkeley. After working as a geotechnical consultant, he joined the Civil Engineering faculty at BYU in 1987 following after his father who was previously a geotechnical professor. His research has involved geotechnical earthquake engineering, deep foundation behavior, bridge abutment behavior, collapsible soils and soil improvement techniques. ASCE has recognized his work with the Huber research award, the Wellington prize, and the Wallace Hayward Baker award. In 2009, he was the Cross-Canada Geotechnical lecturer for the Canadian Geotechnical Society. He received the Jorj Osterberg Award from the Deep Foundations Institute in 2014.
Date(s) - Feb 20, 2019
12:00 pm - 1:00 pm