Field Adaptation and Evaluation of Prototype of In Situ Geotechnical Torsional Cylindrical Shear Testing System for Earthquake Resistant Design

这个第一阶段的SBIR项目提出了一个原型的抗震原位岩土测试系统的现场适应和评估。该系统旨在为动力地震分析（如液化、循环退化和变形）所需的原位土壤沉积物的循环剪切与应变特征提供可靠的估计。和未退化非线性非弹性特性。需要解决的问题包括可靠地预测放大运动、液化和土壤沉积物的变形——这些都是重大地震损失的来源。虽然这一领域已经取得了很大进展，但在估计土壤特性方面仍然非常需要根本性的改进。将施加类似地震的循环荷载。然而，试验必须在原地进行，并采取许多步骤以保持原地条件。最近的实验室原型测试显示了所提出方法的前景，并且将其应用于现有的关键抗震设施的改造和地震活跃地区的土地利用规划的潜力是很好的。

This Phase I SBIR project proposes a field adaptation and evaluation of a prototype in situ geotechnical testing system for earthquake resistance. The system is to provide reliable estimates for soil deposits of the in situ cyclic shear vs strain characteristics needed by dynamic earthquake analyses such as liquefaction, cyclic degradation and deformation, and undegraded nonlinear inelastic characteristics. Problems to be addressed include reliably predicting amplified motions, liquefaction, and deformations of soil deposits - sources of significant seismic loss. While this area has been advanced considerably, fundamental improvements in estimating soil characteristics are still greatly needed. Earthquake-like cyclic loads are to be applied. Tests, however, are to be conducted in situ with many steps to preserve in situ conditions. Recent laboratory prototype tests show promise in the proposed approach and the potential is good to apply it to retrofitting of existing critical constructed facilities for earthquake resistance and in land use planning for seismically active areas.