FIELD EVALUATION OF LIQUEFACTION POTENTIAL BY ARIAS INTENSITY DUE TO IMPACT LOADING

在过去的35年里，人们对地震荷载引起的松散、饱和、无黏性土壤的液化进行了广泛的研究，产生了基于实验室和经验的方法来评估液化潜力。Kayen和Mitchell（1997）提出了一种基于Arias强度的基于地震的方法来评估液化潜力，该方法已被证明是高度可靠的。（阿里亚斯烈度间接反映了地震的震级和持续时间。）我们建议评估Kayen和Mitchell（1997）液化评估方法对其他（非地震）载荷类型的适用性。荷载的来源是2000年3月26日发生在西雅图市中心的Kingdome的内爆。Kingdome地基土由可能液化的填充物和冲积沉积物组成；然而，在内爆之前，并没有确定的程序来评估土壤是否会由于结构下降产生的冲击而液化。Shannon & Wilson安装了一系列井下和地面仪器来测量地面运动和混凝土碎片下落产生的孔隙压力。这种冲击荷载类似于深动压实产生的荷载，这是一种常用的土壤改良方法。我们建议分析Shannon &amp； Wilson在Kingdome内爆期间收集的数据，以评估将基于地震的液化概念应用于传统拆除/场地改善技术引起的液化的有用性

The liquefaction of loose, saturated, cohesionless soils due to earthquake loading has been studied extensively over the past 35 years, resulting in both laboratory and empirically based procedures to evaluate liquefaction potential. Kayen and Mitchell (1997) proposed an earthquake-based approach based on Arias intensity to assess liquefaction potential that has proven to be highly reliable. (The Arias intensity indirectly accounts for both magnitude and duration of an earthquake motion.) We propose to evaluate the applicability of the Kayen and Mitchell (1997) method for liquefaction evaluation to other (non-seismic) types of loading. The source of the load is the implosion of the Kingdome in downtown Seattle, which took place on March 26, 2000. The Kingdome foundation soils consist of potentially liquefiable fill and alluvial sediments; however, before the implosion there was no established procedure to evaluate whether the soils would liquefy due to the impact produced by the falling structure.Shannon & Wilson installed an array of downhole and surface instruments to measure ground motion and pore pressure generated by the falling pieces of concrete. This sort of impact load is analogous to loads produced by deep-dynamic compaction, a commonly used soil improvement method. We propose to analyze the data collected by Shannon & Wilson during the Kingdome implosion to assess the usefulness of applying earthquake-based liquefaction concepts to liquefaction induced by conventional demolition/site improvement techniques