基于3D打印技术的粗糙节理岩体对应力波能量传递的影响研究  

Effects of rough jointed rock mass using 3D printing technology on stress wave energy propagation

作　　者：李业学[1] 王元元 曹林涛[1] LI Yexue;WANGYuanyuan;CAO Lintao(School of Civil Engineering and Architecture,Hubei University of Arts and Science,Xiangyang 441053,Hubei,China)

机构地区：[1]湖北文理学院土木与建筑工程学院,湖北襄阳441053

出　　处：《实验力学》2023年第2期267-275,共9页Journal of Experimental Mechanics

基　　金：国家自然科学基金(52074112);湖北省高等学校优秀中青年科技创新团队计划项目(T2021019)资助;湖北省自然科学基金创新发展联合基金重点项目(2022CFD009)。

摘　　要：将标准JRC(Joint Roughness Coefficient)曲线沿直线拉伸生成对应JRC曲面,模拟粗糙节理面,采用3D打印技术,制作包含JRC节理面的圆柱体试样。通过节理试样的SHPB(Split Hopkinson Pressure Bar)试验,探讨了节理面粗糙度(以JRC描述)和应变率对应力波能量传递的影响规律。试验研究表明:(1)应力波穿过相同JRC的节理时,反射能量系数大于透射能量系数。这表明:节理粗糙特征有助于应力波反射,并抑制应力波透射。(2)随着JRC增大,反射能量系数相应增加,透射能量系数相应减小,且最终都收敛于一个常数。(3)应变率对应力波能量传递影响类似于JRC,但应变率的影响趋势线是发散的。(4)根据应力波能量传递分析,文中提出了一种更优的透射波终点确定方法,即能量下降法。Extending the JRC curve along the line generates the corresponding JRC curved surface to model the rough joint surface.Using 3D technology,cylinder sample embedded JRC joint surface is printed.SHPB test is conducted to investigate the effects of joint surface roughness and strain rates on stress wave energy propagation.The study draws the following conclusions.(1)Reflected energy rate is more than transmitted energy rate when stress wave passes through the joint with the same JRC.It shows that joint roughness helps stress wave reflection and restrains its transmission.(2)With the increasing of JRC,energy rate of reflected wave grows up slowly and energy rate of transmitted wave decreases,which converge to a constant at last.(3)The effect of strain rate on stress wave energy propagation is similar to JRC.However,the trend of effect of strain rate is divergent.(4)By analyzing the stress wave energy propagation,a method determining the endpoint of transmitted wave,named as energy descent method,is proposed,which is better than traditional methods.

关 键 词：3D打印 粗糙节理 应力波 能量 

分 类 号：TU452[建筑科学—岩土工程]