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Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.11 P.807-817

10.1631/jzus.A1100015


Examination of DMT-based methods for evaluating the liquefaction potential of soils


Author(s):  Gordon Tung-Chin Kung, Der-Her Lee, Pai-Hsiang Tsai

Affiliation(s):  Sustainable Environment Research Center, National Cheng Kung University, Taiwan 701, Tainan, Department of Civil Engineering, National Cheng Kung University, Taiwan 701, Tainan

Corresponding email(s):   tphsiang@gmail.com

Key Words:  Liquefaction, Flat dilatometer test (DMT), Horizontal stress index, Earthquake


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Gordon Tung-Chin Kung, Der-Her Lee, Pai-Hsiang Tsai. Examination of DMT-based methods for evaluating the liquefaction potential of soils[J]. Journal of Zhejiang University Science A, 2011, 12(11): 807-817.

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Abstract: 
The flat dilatometer test (DMT) has the potential to be a useful tool in the evaluation of liquefaction potential of soils. In practice, it is necessary to carefully examine existing DMT-based methods for evaluating liquefaction potential. We conducted the DMT and cone penetration test (CPT) in high liquefaction potential areas to examine the existing DMT-based methods for liquefaction potential evaluation. Specifically, the DMT and CPT were conducted side-by-side at each of six in-situ sites, and thus it is feasible to utilize those test results to validate the existing DMT-based methods. The DMT parameter, horizontal stress index (KD), is used as an indicator for estimating liquefaction resistance of soils in terms of cyclic resistance ratio (CRR). The analysis results revealed that the existing KD-based liquefaction evaluation methods would overestimate the CRR of soils, which leads to overestimation of the factor of safety against liquefaction. Also, the estimations of DMT-KD values by using the CPT-qc as well as the correlation between DMT-KD and CPT-qc proposed by the previous studies would be significantly smaller than field measurements. The results reflected that further validation of the existing DMT-based methods for liquefaction evaluation is desirable.

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Reference

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