卸载效应对节理裂隙岩体内应力波能量耗散影响研究  

The influence of macrojoint unloading effect on the stress waves energy dissipation in rock masses with microdefects and macrojoints

作　　者：王梦[1] 范立峰[1] WANG Meng;FAN Lifeng(College of Architecture and Civil Engineering,Beijing University of Technology,100124 Beijing,China)

机构地区：[1]北京工业大学城市建设学部,北京100124

出　　处：《应用力学学报》2022年第5期869-878,共10页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.12172019);北京市杰出青年基金资助项目(No.JQ20039)。

摘　　要：研究了考虑宏观节理卸载效应的节理裂隙岩体内应力波的能量耗散规律,综合分析了细观裂隙和具有不同加卸载变形特性的宏观节理对应力波传播的影响。首先,研究了5种波形入射波(方形波、半正弦波、三角形波、左三角形波和右三角形波)在节理裂隙岩体内的能量透射特性;其次,比较了考虑卸载效应与不考虑卸载效应的应力波能量透射特性的差异;最后,讨论了入射波波形、传播距离和入射波幅值对能量透射系数的影响,并进一步揭示了入射波波形、传播距离和入射波幅值对考虑与不考虑卸载效应的能量透射系数差异的影响。研究结果表明:考虑卸载效应的能量透射系数总是小于不考虑卸载效应的能量透射系数。另外,节理裂隙岩体内方形波的能量透射系数最大,右三角形波的能量透射系数最小;方形波的能量透射系数差异最小,左三角形波的能量透射系数差异最大。能量透射系数随着传播距离的增加而减小,随着入射波幅值的增加而增大;能量透射系数差异随着传播距离的增加而增大,随着入射波幅值的增加而减小。The energy dissipation of stress wave propagation through rock masses with microdefects and macrojoint considering unloading effects was investigated.The combined effects of microdefects and macrojoints with different unloading and loading models on stress wave propagation were considered.First,the transmission properties of five waveforms of incident waves(rectangular wave,half-sinusoidal wave,triangular wave,left-triangular wave and right-triangular wave)propagating through the rock masses with microdefects and macrojoint were analyzed.Then,the differences in the energy transmission properties of stress waves propagating through rock masses with microdefects and macrojoint considering unloading effects and those not considering unloading effects were compared.Finally,the effects of propagation distance and incident wave amplitude on the energy transmission coefficient were discussed.The effects of propagation distance and incident wave amplitude on the difference of energy transmission coefficient with and without considering unloading effect were further revealed.The results show that the energy transmission coefficient considering unloading effect is always smaller than the energy transmission coefficient not considering unloading effect.In addition,the energy transmission coefficient of the rectangular wave is the largest while the energy transmission coefficient of the right-triangular wave is the smallest.The difference of energy transmission coefficient of the rectangular wave is the smallest whereas the difference of energy transmission coefficient of the left-triangular wave is the largest.The energy transmission coefficient decreases with the increase of propagation distance but increases with the increase of incident wave amplitude.The difference of energy transmission coefficient increases with the increase of propagation distance and decreases with the increase of incident wave amplitude.

关 键 词：卸载效应 细观裂隙 宏观节理 应力波传播 

分 类 号：TU45[建筑科学—岩土工程]