中低应变率下砂岩动力特性试验研究  被引量:4

Experimental investigation of mechanical properties of sandstone subjected to medium to low strain rate loadings

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作  者:李增 马林建 吴家文 罗棕木 王波 LI Zeng;MA Lin-jian;WU Jia-wen;LUO Zong-mu;WANG Bo(State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University of PLA,Nanjing 210007,China)

机构地区:[1]陆军工程大学国防工程学院爆炸冲击防灾减灾国家重点实验室

出  处:《振动工程学报》2020年第1期120-127,共8页Journal of Vibration Engineering

基  金:国家自然科学面上基金资助项目(51774295,51679249)

摘  要:为研究岩石在中低速冲击下的动力特性,利用MTS和落锤冲击试验系统进行了红砂岩准静态和动态单轴压缩试验,获得了10-2-101.7 s-1应变率范围砂岩全应力-应变曲线。结果表明,中低应变率加载条件下,砂岩经历典型压密、弹性变形、非稳定裂纹发展至脆性破裂后阶段。随着加载应变率的提高,砂岩峰值应力及其对应应变、残余应变均逐步增加,破坏模式则由X状共轭剪切破坏转变为劈裂破坏;动态强度增长遵循热活化和宏观黏性机制联合作用规律;中低应变率下岩石的吸收总能量和弹性应变能随变形演化规律基本一致,且弹性应变能和较耗散应变能的应变率效应更为显著。To investigate the mechanical properties of rocks under intermediate to low velocity impact loadings,quasi-static and dynamic uniaxial compression tests of red sandstone samples are conducted using MTS and drop weight impact test facilities.A series of stress-strain curves in the strain rate range of 10-2-101.7 s-1 is obtained.The results show that under medium to low strain rate loading conditions,the deformation of sandstone experienced typical compaction stage,elastic deformation stage,unstable crack propagation stage and brittle failure stage.As the strain rate increases,the peak stress and its corresponding strain as well as the residual strain of specimens increase and the failure mode of sandstone transits from shear breakage to splitting breakage.The enhancement of the dynamic strength is governed by the combined effects of thermal activation and macro-viscous mechanisms.The evolution laws of the total energy absorbed by sandstone during the deformation process are similar to that of the elastic strain energy.It is further found that the strain rate effect on the elastic strain energy is more remarkable compared with that on the dissipated strain energy.

关 键 词:砂岩 中低应变率 全应力-应变曲线 破坏模式 率效应 能量演化 

分 类 号:TU443[建筑科学—岩土工程]

 

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