Site Characterization for Soil Liquefaction Susceptibility Using Geotomography

液化地基 失败是导致 地震时的损坏。 一个 最大限度地减少这一问题的重要步骤 损害是为了确定网站， 容易被液化， 对土壤进行现场测量 与过剩孔隙有关的性质 压力发展。 现有 现场勘察的方法包括 无法描述站点特征 完全是因为测量 仅在离散地点进行; 土壤空间变异性 属性必须由 其他方法。 第一阶段的目标是 该项目旨在开发和 实施地震层析成像， 获得更完整的 场地特征 易液化的。 在 地震层析成像，大量的 土壤中有大量的 来测量 垂直和横向变化 初始切向剪切模量 （液化参数 敏感性评价）。 的 第二阶段的目标是 应用地震层析成像， 地点在南部的查尔斯顿 卡罗莱纳，地震带 将层析成像与 常规场地特性 技术，如标准 贯入试验（SPT）和圆锥 贯入试验（CPT）。 土壤 容易液化的是 已知存在于该地区。

Liquefaction-induced ground failures are a major cause of damage during earthquakes. An important step in minimizing this damage is to identify sites that are susceptible to liquefaction by making in situ measurements of soil properties related to excess pore pressure development. Existing methods of site investigation are unable to characterize a site completely because measurements are made at discrete locations only; the spatial variability of soil properties has to be inferred by other methods. The objective of the first phase of this project is to develop and implement seismic geotomography to obtain a more complete characterization of sites susceptible to liquefaction. In seismic geotomography, a mass of soil is traversed by a large number of seismic waves to measure the vertical and lateral variability of the initial tangent shear modulus (a parameter used for liquefaction susceptibility evaluation). The objective of the second phase is to apply seismic geotomography at a site in the Charleston, South Carolina, seismic zone so as to compare geotomography with conventional site characterization techniques, such as the standard penetration test (SPT) and the cone penetration test (CPT). Soils susceptible to liquefaction are known to exist in this area.