3种岩石的平台巴西圆盘动态劈裂拉伸试验分析

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摘要为研究应变率对岩石动态劈裂拉伸性能的影响，采用紫铜波形整形器改进后的直径为100 mm的分离式Hopkinson压杆试验系统，以不同打击杆速度冲击斜长角闪岩、绢云母石英片岩和砂岩的平台巴西圆盘试样，分析不同应变率下3种岩石的拉伸敏感系数、径向应变、拉伸杨氏模量以及破坏方式的变化规律。试验结果表明：3种岩石的拉伸敏感系数随着应变率的提高而增加，斜长角闪岩的动态拉伸强度对应变率最敏感，绢云母石英片岩次之，砂岩的敏感性最弱；3种岩石的径向峰值应变与应变率成正比，绢云母石英片岩和斜长角闪岩的径向极限应变远小于砂岩的径向极限应变；3种岩石的卸载段模量都大于各自上升段的杨氏模量，斜长角闪岩和绢云母石英片岩的卸载段模量远大于砂岩的卸载段模量；岩石动态劈裂拉伸的最终破坏方式与打击杆速度密切相关。关键词：岩石力学；平台巴西圆盘；应变率

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关键词 ：岩石力学, 平台巴西圆盘, 应变率

Abstract：In order to study the influence of strain rate on the dynamic split tensile properties of rock，the dynamic split tensile tests of flattened Brazilian disc specimens of amphibolite，sericite-quartz schist and sandstone，are carried out by using split Hopkinson pressure bar(SHPB) equipment with a diameter of 100 mm improved by copper waveform shaper. The changing rules of tensile sensitivity coefficient，radial strain，tensile Young?s modulus and failure modes are analyzed. Experimental results show that the tensile sensitivity coefficients of three rocks increase with the increase of strain rate，amphibolite is most sensitive to strain rate and sandstone is least sensitive to strain rate. The radial peak strain of three rocks is proportional to strain rate，and the radial ultimate strain of sandstone is the biggest. The Young?s moduli of three rocks in unloading process are greater than those in loading process. The failure modes of three rocks are closely related to impact velocity.

Key words： rock mechanics flattened Brazilian disc strain rate

收稿日期: 2013-05-20

引用本文:

许金余，刘石，孙蕙香. 3种岩石的平台巴西圆盘动态劈裂拉伸试验分析[J]. 岩石力学与工程学报, 2014, 33(sl): 2814-2819.
XU Jinyu，LIU Shi，SUN Huixiang. ANALYSIS OF DYNAMIC SPLIT TENSILE TESTS OF FLATTENED BRAZILIAN DISC OF THREE ROCKS. , 2014, 33(sl): 2814-2819.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/2814

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