【摘要】 通过汶川8.0级地震中不同地区、不同烈度的4个典型液化场地宏观现象分析以及现场测试,确认了汶川地震天然砂砾土液化的真实性并初步研究了其特征。结果表明汶川地震中砂砾土液化是真实存在的,4个场地均为砂砾土液化。地表喷出物与实际液化土类差异显著,而上覆非液化层厚度是影响地表是否可能喷出砾石的主要因素。重型动力触探击数是值得推荐的砂砾土液化判别的指标,若采用剪切波速指标则需要将砂砾土进行分类处理,需考虑含砾量、平均粒径等指标的影响。更多还原

【Abstract】 In terms of detailed investigation for 4 typical liquefied sites which are located in 3 different seismic intensity regions,the gravel soil liquefaction phenomena in the Wenchuan Earthquake are confirmed and the characteristics of the liquefied gravel soil are briefly analyzed.The results show that: The liquefied soils of 4 typical test sites are gravel soils;The ejected soils have notable difference with the liquefied soils,and the depth of the upper non-liquefied soil played a major role in the possibility of gravel ejecting from underground;The heavy dynamic cone penetration test is strongly recommended for gravel soil liquefaction potential evaluation,while the effect of gravel content and average particle diameter should be considered carefully when the shear wave velocity is adopted for analyzing the gravel soil liquefaction.更多还原