Centrifuge Modelling of Compaction Grouting

压实灌浆的离心机建模

• 批准号: 9622399
• 负责人: Deborah Goodings
• 金额: $ 17.2万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-07-15 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9622399&HistoricalAwards=false
• 关键词: Centrifuge; Modelling; Compaction; Grouting

9622399 Compaction grouting is the injection under high pressure of stiff cement-based grout into soil. There is existing and clear evidence that the technique works as a method to halt or reverse the effects of ground settlement, and to modify and improve characteristics of existing soils and in situ stress conditions. The application is overwhelmingly in the hands of specialized consultants and contractors, but even among them, questions persist about the details of soil and grout mechanics. This project will answer questions on the interrelationship between injection depth, grout pressure, grout mix, soil conditions and in situ stress, and the resulting effects on soil compaction, shear deformation, and soil displacement. Preliminary centrifuge indicates that this test technique with small, 1-g models can demonstrate general mechanisms of behavior. However, stress-correct centrifuge models are necessary to develop reliable representation of full-scale field response. There is a commitment in this work for cooperative interaction with on- going NSF-sponsored research on FEM modeling and full-scale field testing of grout injection at North Carolina State University, and with the U.S. Army Corps' Waterways Experiment Station. The centrifuge models completed for this award will be highly complimentary to address questions relating to the design of grout and injection schemes, including variable parameters such as injection depth, pressure, grout injection angle, and surface surcharge. Commitment has also been made by grouting contractors to advise on this project, and plans are included for practical training of researcher teams. ***

9622399 压密灌浆是在高压下将水泥基浆液注入土壤中。 有现有的和明确的证据表明，该技术作为一种方法，以停止或扭转地面沉降的影响，并修改和改善现有土壤的特性和原地应力条件。 该应用程序绝大多数掌握在专业顾问和承包商手中，但即使在他们中间，也存在有关土壤和灌浆力学细节的问题。 本项目将回答有关注入深度、灌浆压力、灌浆混合物、土壤条件和原地应力之间的相互关系以及对土壤压实、剪切变形和土壤位移的影响的问题。 初步离心表明，这种测试技术与小，1克模型可以证明一般的行为机制。 然而，应力校正离心模型是必要的，以发展可靠的代表性的全尺寸的现场响应。 在这项工作中，有一个承诺，即与正在进行的NSF赞助的北卡罗来纳州州立大学灌浆建模和全尺寸现场测试研究以及美国陆军部队的水道实验站进行合作互动。 为该奖项完成的离心机模型将非常有益于解决与灌浆和注入方案设计相关的问题，包括注入深度、压力、灌浆注入角度和表面超载等可变参数。 灌浆承包商也承诺就该项目提供建议，并计划对研究人员团队进行实际培训。 ***