United States Department of Transportation
i
Practical Recommendations for Evaluation and Mitigation of Soil Liquefaction in Arkansas
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2010-02-02
[PDF-4.67 MB]
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Abstract:Northeastern Arkansas has some of the largest design earthquake ground motions in the continental U.S. due to its location within the New Madrid Seismic Zone (NMSZ). These large earthquake ground motions are particularly problematic when coupled with the unknown seismic response of the deep, soft soils of the Mississippi Embayment. Based on empirical standard penetration test (SPT) liquefaction triggering analyses, many soils in this area exhibit apparent liquefaction susceptibility at depths up to 30-plus m (100-plus ft). However, there is very little guidance in the literature on what to do in these situations, because soils soft enough to liquefy at great depths (i.e. greater than approximately 20 m [65 ft]) have not been documented in the case history databases from previous earthquakes. Currently, the Arkansas State Highway and Transportation Department (AHTD), and Tech Reports in involved with bridge construction in the NMSZ, are forced to drive piles for bridge foundations to significant depths in order to mitigate against the loss of strength in these potentially liquefiable soils during an earthquake.
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