摘要
岩石爆破等许多工程涉及到岩石的动态破坏力学特性,而岩石的应力状态和加载速率对其动态抗拉强度会产生明显的影响。对甘肃北山480~490 m深处的花岗岩进行了动态巴西劈裂试验,研究了岩石强度随加载速率的变化规律及岩石破坏模式。结果表明:随着加载速率的增加,岩石的动态抗拉强度明显增加,并呈现出硬化现象。岩石在动态巴西劈裂试验中,表现为拉伸破坏;在加载局部位置,出现了较小的破碎区。
A rock blasting and many other engineering related to the dynamic failure mechanical characteristics of the rock and the stress status and loading rate of the rock would cause obvious influences to the dynamic tensile strength.The dynamic Brazil split test was conducted with the granite in the depth of 480~490 m in Beishan of Gansu Province.The paper had a study on the variation law of the rock strength with the loading rate and the rock failure mode.The results showed that with the loading rate increased,the dynamic tensile strength would be increased obviously and would have a hardening phenomenon.In the dynamic Brazil split test,the rock was in a tensile failure.In a local position of the loading,the rock had a small broken area.
作者
谢珉
张振亚
XIE Min;ZHANG Zhenya(Yunnan Power Grid Company Limited,Kunming 650011,China;Ningbo University of Technology,Ningbo 315211,China)
出处
《建井技术》
2020年第6期30-33,共4页
Mine Construction Technology
基金
云南电网科技有限公司科技项目资助(QCSG211009B8)。
关键词
花岗岩
动态巴西劈裂试验
力学特性
加载速率
破坏模式
granite
dynamic Brazil split test
mechanical characteristics
loading rate
failure mode
