Strain Distribution Within Geosynthetic Reinforced Soil Slopes

土工合成材料加筋土坡内的应变分布

• 批准号: 0401494
• 负责人: Jorge Zornberg
• 金额: $ 12.55万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0401494&HistoricalAwards=false
• 关键词: Strain; Distribution; Within; Geosynthetic; Reinforced

Soil reinforcement using geosynthetics is a very attractive alternative for highway embankment and retaining wall projects because of the economic benefits it offers in relation to cenventional retaining structures. Desigh of reinforced soil slopes is typically performed using software-based techniques (limit equilibrium), which require significant assumptions regarding the distribution of strains within the reinforcement elements. However, to date, the assumed strain distributions have not been fully validated against monitored results. One consequence of this is a perceived overconservatism in design.The overall objective of this research initiative is to generate and integrate (via centrifuge modeling, digital image analysis, and finite element analysis) data that will provide a definite answer regarding the strain distribution to be adopted in reinforced soil slope design. Specificaly, this project will integrate results from the following five phases: (i) a centrifuge modeling investigation undertaken to generate experimental data on the performance fo geosynthetic reinforced soil slopes under working stress conditions; (ii) a digital image processing and analysis effort performed to collect and evaluate strain information from inflight-captured images of videotaped centrifuge models; (iii) a numerical (finite element) study performed to compile parametric evaluations of reinforced soil slope behavior, after having calibrated numerical procedures against data collected in the previous experimental phase; (iv) an evaluation effort to incorporate findings on reinforcement strain distribution into current reinforced soil guidelines; and (v) an educational component to integrate digital video clips of centrifuge geotechnical models into multimedia presentations to be used for undergraduate and graduate geotechnical instructions as well as for recruitment of underrepresented minority high school students into engineering programs.In addition to the specific goal of refining design guidelines for geosynthetic reinforced soil slopes by gaining better understanding of the pattern of strain distributions, the proposed research is the cornerstone of larger, ongoing agendas under active development on reinforced soil research by the PI and on geotechnical modeling at the PI's institution. In fact, the proposed investigation will initiate implementation of innovative procedures invilving digital image analysis in geotechnical centrifuge testing at the University of Colorado, will contribute to ongoing efforts of cross-validation between physical and numerical modeling of geotechnical systems, and will foster integration of research into engineering education.

使用土工合成材料的土壤加固是高速公路路堤和挡土墙项目的非常有吸引力的替代方法，因为它与固有保留结构相关的经济利益。 通常使用基于软件的技术（极限平衡）进行增强土壤斜坡的底线，这需要对钢筋元素内菌株的分布进行重大假设。 但是，迄今为止，假定的菌株分布尚未完全验证受监视的结果。 结果的一个结果是一种在设计中感知到的过度持续主义。该研究计划的总体目标是生成和集成（通过离心机建模，数字图像分析和有限元分析）数据，该数据将提供有关在强化土壤斜坡设计中采用的应变分布的确定答案。 特定于该项目将整合以下五个阶段的结果：（i）进行的一个离心机建模研究，以生成有关在工作应力条件下地质合成增强土壤斜率的实验数据； （ii）进行的数字图像处理和分析工作旨在从录像带离心机模型的机上捕获图像中收集和评估应变信息； （iii）在对以前实验阶段收集的数据进行了校准的数值程序之后，进行了一项数值（有限元）研究，以对增强土壤斜率行为进行汇编的参数评估； （iv）将有关增强应变分布的发现纳入当前增强土壤指南的评估工作； （v）一个教育组成部分，将离心岩土模型的数字视频片段整合到多媒体演示中，用于本科和研究生岩土技术指导以及用于招募缺乏代表性的少数族裔学生的本科和研究生岩土的指导以及工程的招募。拟议的研究是在PI和PI机构的岩土建模方面的积极发展下较大，正在进行的议程的基石。 实际上，拟议的调查将启动在科罗拉多大学的岩土技术离心机测试中的创新程序实施创新程序，将有助于地岩土技术系统的物理和数值建模之间的跨验证努力，并将促进研究研究中的研究整合工程教育。