期刊论文

中文

Dizhen Xuekan

1003-868X

2015

35

6

828-832

10.13409/j.cnki.jdpme.2015.06.019

国家自然科学基金项目（51204098） 南华大学“十二五”科技创新团队项目（2012NHCXTD12）资助

本校为第一机构

为了研究应力波在穿越层状节理岩体发生透射和反射作用后能量的衰减规律,基于Froude相似比例法制作了层状节理岩体模型,并对模型进行瞬时冲击实验研究。通过对不同位置的加速度时程信号的分析,得出应力波因在节理结构面之间的透反射波的叠加作用形成增强信号,使得穿过节理后的时程信号峰值均未在刚起跳时达到最大,而是起跳后的一段时间先后出现峰值。通过离散快速傅里叶变换对时域信号进行频谱特性分析,得出规律:节理对应力波的阻隔作用使节理前后信号的主频和频率内最大振幅均呈非线性降低趋势,信号的高频部分迅速衰减、能量逐渐被吸收。

In order to research the attenuation law of energy in the process that stress wave crosses the rock mass with layered joint forms transmission and reflection.The model of the rock mass with layered joint was made according to the Froude proportion method,and then the instantaneous impact experiment was conducted on the model.Based on the analysis of the time-domain signal of the acceleration in different locations,it shows that the peaks of time-history signals which passed the joint are maximum during the time after its jumping instead of at the beginning of its jumping because the enhanced s...