Seismic Behavior of Soil Nailed Walls in the San Francisco Bay Area During the 1989 Loma Prieta Earthquake

该项目是美国国家科学基金会/美国地质勘探局国家减少地震灾害计划(NEHRP)倡议的一部分，目的是调查1989年10月17日洛马普里塔地震的影响。它继续了洛马普里塔地震后第二天启动的研究，即收集旧金山湾区土钉墙抗震性能的易腐烂数据。土钉是一种施工程序，用于支撑临时或永久目的的垂直土方路基。土钉在许多方面不同于传统的桩和锚杆支撑系统。这项技术最早是在加利福尼亚州旧金山地区使用的，在过去的5到6年里，那里建造了许多临时和永久的墙。在加州，土钉墙的主要问题是它们在地震中的表现。这个后续项目的主要目标是分析收集到的数据，以便更好地了解土钉墙在地震力作用下的行为。地震后收集的数据正在与地震前的数据进行比较，以确定墙和土壤移动以及钉子阻力的变化。目前正在从土壤条件、墙体几何形状和施工以及地面运动等方面对其性能进行评估。

This project is part of the NSF/USGS initiative within the National Earthquake Hazard Reduction Program (NEHRP) to investigate the effects of the Loma Prieta earthquake of 17 October 1989. It continues the research that was initiated the day following the Loma Prieta earthquake, namely to collect the perishable data on the seismic performance of soil nailed walls in the San Francisco Bay area. Soil nailing is a construction procedure used to shore vertical soil cuts for temporary or permanent purposes. Soil nailing differs from conventional soldier pile and tie-back shoring systems in many ways. The technique was first used in California in the San Francisco area, where numerous temporary and permanent walls have been constructed in the past 5 to 6 years. The major concern in California with soil nailed walls is their performance during earthquakes. The main objective of this follow-on project is to analyze the data collected so as to obtain a better understanding of the behavior of soil nailed walls when subjected to seismic forces. Data collected following the earthquake are being compared with the pre- earthquake data to determine the changes in the wall and soil movements, and in the nail resistance. The performance is being evaluated with respect to soil conditions, wall geometry and construction, and ground motions.