Simplified DMT-based methods for evaluating liquefaction resistance of soils |
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Authors: | Pai-Hsiang Tsai Der-Her Lee Gordon Tung-Chin Kung C. Hsein Juang |
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Affiliation: | 1. New Zealand School of Forestry, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand;2. Faculty of Agriculture and Life Sciences, Lincoln University, PO Box 84, Christchurch 7647, New Zealand;3. Research Department, The Morton Arboretum, 4100 Illinois Route 53, Lisle, IL 60532-1293, USA;4. Geological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand |
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Abstract: | This paper presents simplified dilatometer test (DMT)-based methods for evaluation of liquefaction resistance of soils, which is expressed in terms of cyclic resistance ratio (CRR). Two DMT parameters, horizontal stress index (KD) and dilatometer modulus (ED), are used as an index for assessing liquefaction resistance of soils. Specifically, CRR–KD and CRR–ED boundary curves are established based on the existing boundary curves that have already been developed based on standard penetration test (SPT) and cone penetration test (CPT). One key element in the development of CRR–KD and CRR–ED boundary curves is the correlations between KD (or ED) and the blow count (N) in the SPT or cone tip resistance (qc) from the CPT. In this study, these correlations are established through regression analysis of the test results of SPT, CPT, and DMT conducted side-by-side at each of five sites selected. The validity of the developed CRR–KD and CRR–ED curves for evaluating liquefaction resistance is examined with published liquefaction case histories. The results of the study show that the developed DMT-based models are quite promising as a tool for evaluating liquefaction resistance of soils. |
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