《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“采用波速法对非饱和土的液化阻力进行修正”

作者：Akhter M. Hossain; Ronald D. Andrus; and William M. CampIII

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2013年2月，139卷第2期，277–287页

关键词：压缩；波速；土体液化；贯入试验；剪切波；非饱和土

摘要：本文利用压缩波速(V_P)和剪切波速(V_S)得到了用于修正低于地下水位的非饱和土液化阻力的明确的经验关系，并对此进行了评估。该经验关系利用已公开发表的四种不同砂土和一种粉砂的室内试验数据得到。基于V_P的室内试验数据要比基于V_P/V_S的试验数据分散性小。为此，本文推荐采用基于V_P的经验关系来修正非饱和土的液化阻力。本文还研究了循环加载和相对密度对该推荐经验关系的影响。通过对40个原位历史试验地点进行了回顾，发现20%的地点的临界层的平均V_P小于1400m/s，表明为非饱和条件。通过计算8个原位情况下的历史数据，对临界层V_P<1200m/s的液化阻力进行修正，并将其录入以贯入阻力和V_S为基础的液化估计图中。研究结果对地下水位以下非饱和条件的液化阻力进行修正是合适的。

Correcting Liquefaction Resistance of Unsaturated Soil Using Wave Velocity

Authors: Akhter M. Hossain; Ronald D. Andrus; and William M. CampIII

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 139, Issue 2 (February 2013), 277–287

Key words: Compression, Wave velocity, Soil liquefaction, Penetration tests, Shear waves, Unsaturated soils

Abstract: Explicit empirical relationships for correcting liquefaction resistance of unsaturated soil below the groundwater table using compression wave velocity (VP) and shear wave velocity (VS) are derived and evaluated in this paper. The relationships are derived using published laboratory test data for four different sands and one silt material. The laboratory test data based on VP exhibit less scatter than the test data based on the ratio VP/VS . For this reason, the VP -based relationship is recommended for correcting the liquefaction resistance of unsaturated soil. The influence of loading cycles and relative density on the recommended relationship is investigated. From a review of 40 field case history sites, it is found that in the critical layers at 20% of the sites, average VP is less than 1,400 m/s, indicating unsaturated conditions. Liquefaction resistances computed for eight field case histories with VP<1,200 m/s in the critical layers are corrected and plotted on penetration- and VS -based liquefaction evaluation charts. The results support the use of the correction for unsaturated conditions below the groundwater table.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000770