不同饱水度红砂岩静态本构关系及动态力学性能研究  

Static constitutive relation and dynamic mechanical properties of red sandstone with different water saturation

作　　者：郑广辉[1] 许金余[1,2] 王鹏[1] 方新宇[1] 王佩玺 闻名[1] ZHENG Guanghui;XU Jinyu;WANG Peng;FANG Xinyu;WANG Peixi;WEN Ming(Department of Airfield and Building Engineering,Air Force Engineering University,Xi’an 710038,China;College of Mechanics and Civil Architecture,Northwest Polytechnic University,Xi’an 710072,China)

机构地区：[1]空军工程大学机场建筑工程系,西安710038 [2]西北工业大学力学与土木建筑学院,西安710072

出　　处：《振动与冲击》2018年第16期31-37,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51378497)

摘　　要：基于电液伺服压力试验机和φ100 mm SHPB试验平台,分别对四种饱水度红砂岩试样进行静态压缩试验和六种应变率的动态冲击试验;借鉴宏观唯象损伤力学概念及Lemairte损伤模型,依据不同饱水度红砂岩静态压缩试验结果,拟合得到分段式水软化-应变损伤本构关系,最后利用所得本构关系,对静态压缩试验结果进行合理分析;SHPB冲击试验结果表明:(1)各饱水度红砂岩均呈现出明显的应变率效应,峰值应力、峰值应变及峰值模量均随着应变率的增大而增大;(2)在水-岩-力的响应体系中,既存在水对岩石的软化作用,同时又存在应变率、孔隙水以及岩石结构之间的动力耦合强化作用,这两种作用始终存在,但随着应变率的变化,两种作用的效能发挥有所浮动,进而影响红砂岩所呈现出的性能。Based on the electro-hydraulic servo pressure tester and?100 mm SHPB test platform,four kinds of saturated red sandstone samples were subjected to static compression test and six kinds of strain rate dynamic impact test.Drawing on the concept of macroscopic phenomenological damage mechanics and Lemairte’s damage model,the constitutive relation of water softening-strain damage was obtained according to the static compression test results of different saturated water.Finally,the results of static compression test were analyzed by using the constitutive relation.SHPB impact test results show that:①The saturated sandstone shows a significant strain rate effect.The peak stress,peak strain and peak modulus increase with strain rate.②In the water-rock-force response system,there is a softening effect of water on the rock,and there is coupling reinforcement between the strain rate,the pore water and the rock structure.Both of these effects are always present,but with the change of the strain rate,the effect of the two effects is floating,which in turn affects the performance of the red sandstone.

关 键 词：岩石力学 饱水度 应变损伤 本构关系 动态力学性能 

分 类 号：TU45[建筑科学—岩土工程]