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Development of design method for support system of cavern using cable bolt

洞室锚杆支护系统设计方法的开发

基本信息

批准号：
15360477
负责人：
OBARA Yuzo
金额：
$ 4.86万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360477/
关键词：
Cable bolt Support system Rock bolt X-ray CT scanner

项目摘要

Rock bolts or cable bolts have been used as a primary support member of underground openings in the last two decades. However, a clear explanation for the support effect of those bolts has not been made sufficiently. In order to clarify the support effect of those bolts, the failure mechanism in a pull-out test of them has been discussed. Then a main support effect was explained by bond strength of rock bolts and cable bolts, and it is necessary to visualize wider area globally and to discuss the failure mechanism of bolt-grout interface, grout and rock mass. After the clarification, the design method for support system of cavern using rock bolts or cable bolts should be discussed.In this research, patterns of the failure in a pull-out test of rock bolt and cable bolt firstly were visualized by X-ray CT scanner to supply the basic data for the detail discussion on the bond failure of rock bolt and cable bolt. In the pull-out tests, a comparison was made between two types of rock bolts and cable bolts. From the results, it was shown that the microscopic failure mechanism is evaluated as the different failure mode. Secondly, the Shear Resistance Model(SRM) was suggested from analyses of the pull-out test in detail. Then the constitutive model of a cable bolt was constructed, based on the SRM. It was clarified that the behavior of cable bolt during the pull-out test can be simulated precisely using the constitutive model. Furthermore, the Characteristics Curve of Cable bolt(CCC) was calculated by the SRM, then a support design of cavern using cable bolts was performed, using the CCC. As a result, the suggested model was convenience for designing embedment length of cable bolt around a cavern.

在过去的二十年中，岩石锚杆或锚索已经被用作地下开口的主要支撑构件。然而，对这些锚杆的支护效果还没有作出充分的解释。为了明确锚杆的支护效果，对锚杆拉拔试验中的破坏机理进行了探讨。从锚杆和锚索的粘结强度解释了一种主要的支护作用，并从全局上对更大范围进行了可视化，探讨了锚浆界面、浆液和岩体的破坏机理。本研究首先利用X射线CT扫描仪对锚杆和锚索的拉拔试验破坏形态进行了可视化研究，为深入探讨锚杆和锚索的粘结破坏提供了基础数据。在拉拔试验中，对锚杆和锚索两种类型的锚杆进行了比较。从结果中，它表明，微观失效机制的不同失效模式进行评估。其次，通过对拉拔试验的详细分析，提出了抗剪模型（SRM）。基于SRM理论建立了锚索的本构模型。结果表明，本构模型能够较准确地模拟锚索抗拔试验过程中的受力行为。此外，还利用SR计算了锚索特征曲线（CCC），并利用CCC进行了洞室锚索支护设计。结果表明，该模型可方便地用于洞室群锚索埋置长度的设计。