Testing the Liquefaction (Ground Failure) Sites Resulting from the 1989 Loma Prieta Earthquake

该项目是NSF/USGS的一部分。 国家地震局的倡议 减少危害计划（NEHRP）， 调查洛马普列塔的影响 1989年10月17日地震。 这项研究计划涉及合作 国家科学基金会 基金会和美国地质调查局。 它利用一个卡车安装的20吨电子 圆锥贯入系统（用于贯入 土壤中的测量），以及独特的 实验室测试系统， 测量初级（P）和次级（S） 土壤中的地震波 他们一起 可以准确地确定现场 土壤中的压力。 土壤测量 包括锥贯入试验（CPT）， Marchetti平板膨胀计 (DMT)和弯曲元件固结计（BEO）。 本研究的目的是：（1） 补充现有锥尖数据库 阻力、剪切波速度和 液化表指数与液化 （2）研究潜在影响 液化侧压力 （3）研究其影响; 土壤扰动和时间（老化）对土壤的影响 硬度和强度。

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. This research program involves collaborative funding between the National Science Foundation and the U.S. Geological Survey. It utilizes a truck-mounted 20 ton electronic cone penetration system (for penetration measurements in soil), as well as a unique laboratory testing system which facilitates measurement of primary (P) and secondary (S) seismic waves in soils. Together, they permit the accurate determination of in-situ stresses in the soil. The soil measurements include the cone penetration test (CPT), seismic-CPT, the Marchetti Flat Dilatometer (DMT) and the bender element oedometer (BEO). The objectives of this research are: (1) to supplement the existing data base of cone tip resistance, shear wave velocity, and dilatometer indices versus liquefaction potential, (2) to investigate the effects of lateral earth pressures on the liquefaction potential, and (3) to study the effects of soil disturbance and time (aging) on soil stiffness and strength.