轴向静载荷作用下变截面红砂岩应力波衰减特性试验研究  

Experimental Study on the Stress Wave Attenuation Characteristics in a Variable Cross-sectional-area Red Sandstone Under Axial Static Stress

作　　者：金解放[1] 王熙博 袁伟[1] JIN Jiefang;WANG Xibo;YUAN Wei(School of Architecture and Surveying Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China)

机构地区：[1]江西理工大学建筑与测绘工程学院,江西赣州市341000

出　　处：《矿业研究与开发》2020年第5期119-125,共7页Mining Research and Development

基　　金：国家自然科学基金项目(51664017,51664016);江西理工大学清江青年英才支持计划项目;江西省教育厅科技项目(GJJ160616,GJJ171490).

摘　　要：基于动静组合加载试验装置,对变截面红砂岩试件进行应力波传播试验,研究轴向静应力对应力波波形、幅值衰减和频率相关性的影响。结果表明:当无轴向静应力时,应力波均为压缩波,而随着轴向静应力的增加,卸载段尾部出现了拉伸波;对于同一测点,随着轴向静应力增加,波宽逐渐变窄;在相同的轴向静应力增量下,随着传播距离的增加,幅值变化量逐渐减小;应力波幅值随传播距离的增加呈指数形式衰减,其幅值空间响应强度、空间衰减系数随着轴向静应力的增加而逐渐减小,减小速率逐渐变慢;应力波信号的能量主要集中在低频范围内,低频波受静应力的影响更为明显。The stress wave propagation tests were carried out on the variable cross-sectional-area red sandstone specimen based on the coupled static-dynamic loading experimental apparatus.The effects of axial static stress on waveform,amplitude attenuation and frequency-dependence were investigated.The results showed that when the specimen was not in axial static stress,the stress wave was a compressive wave.As the axial static stress increased,a tensile wave appeared at the end of the unloading stage.At the same measuring point,as the axial static stress increased,the wave duration gradually narrowed.Under the same axial static stress increment,the amplitude gradually decreased with the increase of the propagation distance.The amplitude variation of stress wave attenuated exponentially with the increase of propagation distance.The spatial response intensity and spatial attenuation coefficient of amplitude gradually decreased with the increase of the axial pressure,and the decreasing rate gradually tended to be slow.The energy of stress wave was mainly concentrated in the low frequency range,and the effect of static stress on the low-frequency wave was obvious.

关 键 词：应力波 变截面 轴向静应力 应力波波形 幅值衰减 

分 类 号：TD315[矿业工程—矿井建设]