岩石类材料动态强度准则  

Dynamic strength criterion for rock-like materials

作　　者：胡晶[1] 姚仰平[2] 张雪东[1] 魏迎奇[1] 张紫涛 陈祖煜[1] HU Jing;YAO Yang-ping;ZHANG Xue-dong;WEI Ying-qi;ZHANG Zi-tao;CHEN Zu-yu(Department of Geotechnical Engineering,China Institute of Water Resources and Hydropower Research,Beijing 100048,China;School of Transportation Science and Engineering.Beihang University,Beijing 100191,China)

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100048 [2]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《岩土工程学报》2020年第3期495-502,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(51879283);国家自然科学基金重点项目(51339006)。

摘　　要：岩石类材料的强度具有明显的应变率效应。首先分析了材料的单轴动态强度特性,提出了一个简单的强度公式,可以统一描述准静态到动态的单轴强度特性。随后,基于统一强度准则开展多轴动态强度研究,在双对数坐标系下,不同应变率下的子午面强度包线近似平行,材料摩擦、静水压力、中主应力效应几乎不受应变率变化的影响。由此建立动态坐标系,将统一强度准则拓展至考虑应变率效应。基于所得的准则,将单轴压缩、拉伸应力状态代入,强度准则可以描述与单轴试验相似的强度规律。最后,采用混凝土试验对强度准则进行了验证。该强度准则基于动态强度特性建立,参数物理意义明确,可以为动态响应分析提供理论基础。The strength of rock-like materials has obvious strain rate effect. Based on the characteristics of uniaxial dynamic strength, a simple strength criterion is proposed, which can uniformly predict the uniaxial strength from quasi-static to dynamic. Under the framework of the unified strength criterion, the triaxial dynamic strength criterion is studied. In the double-logarithmic coordinate system, the meridian strength envelopes at different strain rates are approximately parallel. The effects of friction, hydrostatic pressure and intermediate principal stress of the materials are not affected by the change of strain rate. Thus, a dynamic coordinate system is established, and the unified strength criterion is extended to consider the strain rate effect. Based on the obtained criterion, the uniaxial compressive and tensile strength are investigated. The strength criterion will represent similar characteristics to those obtained by uniaxial tests. Finally, the strength criterion is verified by strength tests of concrete. By fully understanding the dynamic strength characteristics, the parameters in the proposed strength criterion have clear physical meanings, and can provide a theoretical basis for dynamic response analysis.

关 键 词：岩石类材料 应变率 强度 动力增长因子 黏聚力 

分 类 号：TU432[建筑科学—岩土工程]