Mechanisms and Implications of Time-Dependent Changes in the State and Properties of Recently Liquefied Sands (NEES-2006-0166)

Mendeley Data2024-01-31 更新2024-06-27 收录

下载链接：

https://datacenterhub.org/deedsdv/publications/view/502

下载链接

链接失效反馈

官方服务：

资源简介：

Title: Mechanisms and Implications of Time-Dependent Changes in the State and Properties of Recently Liquefied Sands (NEES-2006-0166) Year Of Curation: 2011 Description: The overall objective of the proposed research is to improve the understanding of the sand aging mechanisms and to better quantify aging influences on engineering properties. Towards this end, the proposed research is subdivided into the following five Tasks, involving synergistic field and laboratory investigations: <ol> <li>Site characterization</li> <li>Field aging study: induction of liquefaction by explosives, vibrocompaction and vibroseis and the monitoring of post-liquefaction time-dependent changes in state and engineering properties in the post-liquefied sand</li> <li>Laboratory study to quantify scale effects</li> <li>Parametric study in the laboratory to discern and quantify the influence of each variable on aging. 5. Development of an analytical model for a QA metric for remedially densified sand that accounts for aging effects</li> </ol> Experiment 1 (Univ. of Michigan, Univ. of Texas at Austin): We made several trips to a quarry owned by Mulzer Crushed Stone, Inc. in Griffin, IN. In July 2007, we performed two VisCPTs. In October 2008, we performed two SCPTs and three CPTs. Experiment 2 (Univ. of Texas at Austin): Vibroseis shaking was used to disturb a loose sand layer that began roughly 1.5 meters below the ground surface. In-situ tests were conducted to record the soil strength and stiffness changes with time following the disturbance. Experiment 3 (Univ. of Texas at Austin): In-situ testing was performed in the shake areas to determine if the test results changed with time following disturbance by vibroseis shaking. Testing included DMT, CPT, VisCPT, SCPT, down-hole, and cross-hole testing. Award: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0530378 PIs & CoPIs: Russell Green, Roman Hryciw, Christopher Baxter Dates: September 15, 2005 - August 31, 2010 Organizations: University of Michigan, University of Texas at Austin Facilities: University of Michigan, Ann Arbor, MI, United States,    University of Texas at Austin, TX, United States Sponsor: NSF - 0530378 Keywords: Cone Penetration Test, Dilatometer Test, shear wave velocity, Liquefied Sand, Sand Aging, Vibroseis Publications: Saftner, David A. (2011). “Time-Dependent Strength Gain in Recently Disturbed Granular Materials. Thesis. University of Michigan. Saftner, D. A.; Hryciw, R. D.; Green, R. A.; Lynch, J. P.; Michalowski, R. L.  (2008). The Use of Wireless Sensors in Geotechnical Field Applications Jirathanathaworn, T.; Hryciw, R. D.; Green, R. A. (2010). Photoelastic Sensors for Measurement of K o Saftner, D.; Green, R.; Hryciw, R.; Lynch, J. (2008). Instrumentation for the NEESR Sand Aging Field Experiment Leclerc, Meghan C. (2008). Evaluation of Gas Dissipation as a Mechanism for Aging of Sands Green, R. A., Hryciw, R. D., Saftner, D. A., Baxter, C. D. P., Jung, Y., & Jirathanathaworn, T.  (2008). Sand Aging Field Study Jung, Yongsub (2010). Determination of soil grain size distribution by soil sedimentation and image processing Jirathanathaworn, Thaweesak (2009). Development of photoelastic methods towards study of mechanical aging of 2-dimensional granular assemblies Lee, Jongwon (2009). Engineering characterization of earthquake ground motions Polito, Carmine P.; Green, Russell A.; Lee, Jongwon (2008). Pore pressure generation models for sands and silty soils subjected to cyclic loading <nb:citations></nb:citations>

标题: 新近液化砂土状态与特性的时变变化机制及影响（NEES-2006-0166）整理年份：2011项目描述：本研究的总体目标为深化对砂土时效老化机制的认知，并精准量化老化效应对工程特性的影响。为此，本研究分为以下五项协同开展的野外与室内试验任务：<ol><li>场地勘察</li><li>野外时效老化研究：通过爆破、振动压实与可控震源（Vibroseis）诱发液化，并监测液化后砂土的状态与工程特性随时间的变化</li><li>室内尺度效应量化研究</li><li>室内参数化研究，以明确并量化各变量对砂土老化的影响</li><li>针对经加固密实的砂土，开发考虑老化效应的质量保证（Quality Assurance, QA）指标分析模型</li></ol>试验1（密歇根大学、德克萨斯大学奥斯汀分校）：研究团队多次赴印第安纳州格里芬市的Mulzer碎石公司（Mulzer Crushed Stone, Inc.）所属采石场开展工作。2007年7月，完成2次可视化静力触探（VisCPT）；2008年10月，完成2次孔压静力触探（SCPT）与3次静力触探试验（Cone Penetration Test, CPT）。试验2（德克萨斯大学奥斯汀分校）：采用可控震源（Vibroseis）振动扰动地下约1.5米处的松散砂土层，随后开展原位测试以记录扰动后砂土强度与刚度随时间的变化。试验3（德克萨斯大学奥斯汀分校）：在振动扰动区域开展原位测试，以探究可控震源扰动后测试结果是否随时间变化，测试内容包括扁铲侧胀试验（Dilatometer Test, DMT）、静力触探试验（Cone Penetration Test, CPT）、可视化静力触探（VisCPT）、孔压静力触探（SCPT）、井下测试与跨孔测试。资助链接：https://www.nsf.gov/awardsearch/showAward?AWD_ID=0530378项目负责人与联合负责人：拉塞尔·格林（Russell Green）、罗曼·赫里丘（Roman Hryciw）、克里斯托弗·巴克斯特（Christopher Baxter）项目周期：2005年9月15日—2010年8月31日依托单位：密歇根大学、德克萨斯大学奥斯汀分校试验设施：美国密歇根州安阿伯市密歇根大学、美国德克萨斯州奥斯汀市德克萨斯大学奥斯汀分校资助方：美国国家科学基金会（National Science Foundation, NSF）——项目编号0530378关键词：静力触探试验（Cone Penetration Test）、扁铲侧胀试验（Dilatometer Test）、剪切波速、液化砂土、砂土时效老化、可控震源（Vibroseis）已发表成果：Saftner, David A.（2011）.《新近扰动粒状材料的强度时变增长规律》[学位论文]. 密歇根大学.Saftner, D. A.; Hryciw, R. D.; Green, R. A.; Lynch, J. P.; Michalowski, R. L.（2008）.《无线传感器在岩土工程现场应用中的实践》Jirathanathaworn, T.; Hryciw, R. D.; Green, R. A.（2010）.《用于静止土压力系数K₀测量的光弹性传感器》Saftner, D.; Green, R.; Hryciw, R.; Lynch, J.（2008）.《NEESR砂土时效老化野外试验的测试仪器》Leclerc, Meghan C.（2008）.《以气体消散为机制的砂土老化效应评估》Green, R. A., Hryciw, R. D., Saftner, D. A., Baxter, C. D. P., Jung, Y., & Jirathanathaworn, T.（2008）.《砂土时效老化野外试验研究》Jung, Yongsub（2010）.《基于土样沉降与图像处理的土颗粒级配测定方法》Jirathanathaworn, Thaweesak（2009）.《用于二维颗粒集合体力学老化研究的光弹性方法开发》Lee, Jongwon（2009）.《地震动的工程特性表征》Polito, Carmine P.; Green, Russell A.; Lee, Jongwon（2008）.《循环荷载作用下砂土与粉土的孔隙水压力生成模型》<nb:citations></nb:citations>

创建时间：

2024-01-31