Seismic Analysis of Soil Nailed Retaining Structures

9224479 Vucetic本研究项目旨在通过使用土钉加固土壤开挖以抵抗地震震动。 土钉支护是一种原位土壤加固技术，在过去的二十年中，已在各种土木工程应用中进行了测试和实施。 基本概念包括随着开挖的进行在地面中放置被动夹杂物（钢筋），以抑制位移，限制开挖期间和之后的减压，并形成可以表现得类似于软质挡土墙的钉体。 地震后的现场调查和室内研究表明，土钉支护结构具有很高的抗震能力。 然而，迄今为止，只有有限的研究已经进行，以评估其响应和可能的故障机制下的地震荷载。 这种研究是发展可靠的设计方法所必需的。 随着土钉支护技术的日益普及，这项研究计划将对岩土工程设计和建造业产生重大影响。 该项目涉及数值分析、实验室实验-其中使用土工离心机使小比例模型经受水平震动-以及地震后观察。 这种综合的方法提供了一个全面的了解地震反应的土钉系统，并将导致具体的工程准则，其抗震设计。 这是洛杉矶的加州大学和纽约理工大学的一个合作项目，在伦斯勒理工学院的土工离心机上进行实验。

9224479 Vucetic This research project addresses the reinforcement of soil excavations to resist earthquake shaking through the use of soil nailing. Soil nailing is an insitu soil reinforcement technique that has been tested and implemented during the past twenty years in a variety of civil engineering applications. The fundamental concept consists of placing in the ground passive inclusions (steel reinforcing bars) as the excavation proceeds, in order to restrain displacements, limit decompression during and after the excavation, and to form a nailed mass that can behave similarly to a soft retaining wall. Post-earthquake field investigations and laboratory studies have shown that soil-nailed structures are highly resistant to earthquake loading. However, to date, only limited studies have been conducted to evaluate their response and possible failure mechanisms under seismic loading. Such research is needed to develop reliable design methodologies. Given the increasing popularity of soil nailing, this research project will have considerable impact on the geotechnical design and construction industries. This project involves numerical analyses, laboratory experiments -- in which a geotechnical centrifuge is used to subject small-scale models to horizontal shaking -- and post- earthquake observations. This integrated approach provides a thorough understanding of the seismic response of soil- nailed systems, and will result in specific engineering guidelines for their seismic design. This is a collaborative project involving the University of California at Los Angeles and the Polytechnic University, New York, with the experiments being performed on the geotechnical centrifuge at Rensselaer Polytechnic Institute.