Soil Liquefaction Hazard Assessment by the Vision Cone Penetrometer

本研究项目涉及使用新开发的视觉锥贯入仪（vis锥贯入仪）进行地震液化危害评估。vispt本质上是一个标准的电子锥形穿透仪，通过包含两个微型CCD视频摄像机进行了修改。摄像机通过两级放大收集连续的土壤地层学视频图像。vispt可以描绘土壤地层，并通过各种计算机视觉技术，提供土壤粒度分析。该项目的目的是在旧金山金银岛的国家岩土实验基地（NGES）收集粘质粘质试验数据，这些地点的细颗粒百分比不同。还采集了物理土壤样本。收集到的粘度测试数据是评估与确定晶粒尺寸分布的图像纹理技术的具体重点。为了说明和量化地层分层和界面对CPT读数的影响，还将visct图像与标准CPT尖端阻力测量结果进行了比较。

This research program addresses the use of a newly developed Vision Cone Penetrometer (VisCPT) for earthquake-induced liquefaction hazard assessment. The VisCPT is essentially a standard electronic cone penetrometer, modified by inclusion of two miniature CCD video cameras. The cameras collect a continuous stream of video images of the soil stratigraphy by two levels of magnification. The VisCPT can delineate soil stratigraphy, and through various computer vision techniques, provide a grain size analysis of the soil.The objective of this project is to collect VisCPT date at the National Geotechnical Experimentation Site (NGES) on Treasure Island in San Francisco, at locations with variable percentages of fine particles. Physical soil samples are also taken. The collected VisCPT data is evaluated with specific focus on image-texture techniques for determining grain size distributions. The VisCPT images are also compared to standard CPT tip resistance measurements in order to illustrate and quantify the effects of stratigraphic layering and interfaces on CPT readings.