Developmet of Joint Element Considering Time-dependency

考虑时间依赖性的联合元件的开发

• 批准号: 07455408
• 负责人: OKUBO Seisuke
• 金额: $ 2.75万
• 依托单位: THE UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455408/
• 关键词: Joint Element; Rock; Discontinuity; Time-Dependency; Creep; Relaxation; Shearing Stress; Rock; Rheology; Joint; Creep; Relaxation; FEM; Shear Strength; Residual Strength

At first, the comprehensive survey of previous publications on time-dependent behavior of rock was performed. Then, the creep and ralaxation tests were carried out under the uniaxial condition to obtain the fundamental properties of a sample rock paying special attention on visco-elasticity. After two testing methods, constant stress and constant strain methods, to obtain the time-dependent properties of joint was thoroughly compared and carefully examined, relaxation in direct shear tests were performed. It was revealed that shear stress decreases monotonously with elapsed time under the constant shear strain.A new joint element which represents the time-dependency was proposed on the basis of the previous publication and the obtained experimental results in this study. The special care was taken that the joint element was comfortable with the previous joint elements as far as possible. The joint element fundamentally consists of springs of which compliance increases with time. Finally, we implemented the joint model onto a computer program of finite element method.

首先，对以前有关岩石随时间变化的出版物进行了全面的调查。然后，在单轴条件下进行蠕变和弛豫试验，以获得样品岩石的基本性质，特别关注粘弹性。在对恒应力和恒应变两种测试方法进行彻底比较和仔细检查以获得接头随时间变化的性能后，进行了直剪松弛测试。结果表明，在恒定剪应变下，剪应力随着时间的推移单调减小。本研究在先前出版物和获得的实验结果的基础上，提出了一种表示时间依赖性的新关节单元。特别注意的是，关节元件尽可能与先前的关节元件舒适。接头元件基本上由弹簧组成，弹簧的顺应性随着时间的推移而增加。最后，我们将联合模型实现到有限元法的计算机程序上。

项目成果

Tubagus Nouval: "岩石のせん断試験における応力緩和" 資源・素材学会 平成8年春季大会 研究・業績発表講演要旨集. 54 (1996)

Tubagus Nouval：日本资源材料学会 1996 年春季会议的“岩石剪切试验中的应力松弛”研究和成果演示摘要 54 (1996)。