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Volume 38 Issue 1
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CAO Zhen-zhong, LIU Hui-da, YUAN Xiao-ming. Reliability of Chinese dynamic penetration test for liquefaction evaluation of gravelly soils[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(1): 163-169. DOI: 10.11779/CJGE201601018
Citation: CAO Zhen-zhong, LIU Hui-da, YUAN Xiao-ming. Reliability of Chinese dynamic penetration test for liquefaction evaluation of gravelly soils[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(1): 163-169. DOI: 10.11779/CJGE201601018
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Reliability of Chinese dynamic penetration test for liquefaction evaluation of gravelly soils

  • 1. Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Institute of Engineering Mechanics, CEA, Harbin 150080, China;
    2. Dep of Civil and Environmental Engineering, Brigham Young University, Provo 84602, USA

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  • Received Date: May 17, 2015
  • Published Date: January 19, 2016
    Graphical Abstract
    • Abstract
  • Chinese Dynamic penetration test (DPT) is an in-situ testing with the advantages of simple apparatus, economical test, and continuous data acquisition, especially for measuring bearing capacity, relative density and classification of gravelly soils. The typical gravelly soils sites are selected from the Chengdu Plain in China and the river bed of Echo dam downstream in the U.S., and China-US dynamic penetration testing and hammer energy measurements are conducted. The results show that: (1) The average of energy transfer ratios is 90% and the standard deviation is 7.7%, derived from 1321 energy time-history records, tested at 3 gravelly soils sites in the Chengdu Plain. The deviation is greatly affected by operation procedure. (2) The DPT test depth, using US drill rig assembling with Chinese DPT cone, can reach as much as 20 meters for assessing soil properties. (3) The average of energy transfer ratios is around 74% and the standard deviation is 8.7%, derived from 1438 energy time-history records, tested at 2 gravelly soils sites on the river bed of Echo dam downstream. The deviation is greatly affected by friction of drill rod and rope. (4) The DPT blows should be corrected according to different hammer energies. The proposed evaluation method for gravelly soils liquefaction, developed from the DPT database of gravelly soils liquefied during 2008 Wenchuan Earthquake, can be applicable for worldwide use.
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    • References (15)
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