全长粘结型树脂锚杆低频超声导波检测应用研究  

APPLICATION OF LOW FREQUENCY ULTRASONIC GUIDED WAVES ON INSPECTION OF FULL-LENGTH-BONDING RESIN BOLT

作　　者：崔江余[1] 孙雅欣[2] 何存富[2] 

机构地区：[1]北京交通大学土建学院,北京100044 [2]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《工程力学》2010年第3期240-245,共6页Engineering Mechanics

基　　金：北京市教委项目(KZ200510005004);国家自然科学基金项目(10602004)

摘　　要：全长粘结型树脂锚杆是煤矿巷道支护工程中一种主要支护形式,对其进行锚固质量检测具有重要意义。该文将树脂锚杆简化为埋于无限大介质中柱状三层杆结构,并通过数值求解计算出相关频散曲线。分析了低频纵向超声导波L(0,1)在全长粘结型树脂锚杆的传播特性。研究表明:20kHz―100kHz范围内L(0,1)模态衰减相对较小,可用于实际工程检测;对于70kHz以下的L(0,1)模态,其在树脂锚杆中的传播速度明显慢于自由锚杆,70kHz―100kHz范围内的L(0,1)模态,在树脂锚杆中的传播速度接近于自由锚杆中的群速度。最后,制作了模型构件,在实验室检测中验证了以上观点,说明L(0,1)模态可以应用于全长粘结型树脂锚杆锚固质量检测。Full-length-bonding resin bolt is one of the most important reinforcing tools in the tunnel supporting of mining industry.The quality of the resin bolt embedded in rock directly affects the stability and safety of the slopes or roofs.This paper simplifies the resin bolt to a mechanic model which is a cylinder rod with cladding embedded in infinite medium.The disperse curves about the resin bolt are calculated.Propagation characteristics of low frequency longitudinal mode L（0,1） in full-length-bonding resin bolt are studied.The attenuation of L（0,1） mode between 20kHz―100kHz is very low,which indicates that the L（0,1） mode can be used in the inspection of full-length-bonding resin bolts.The velocity of L（0,1） mode in the resin bolt below 70kHz is slower than the group velocity of L（0,1） in free bolt;the velocity of L（0,1） mode in the resin bolt between 70kHz―100kHz is close to the group velocity of L（0,1） in free bolt.At the same time,the experiments about full-length-bonding resin bolt detected using ultrasonic guided wave are carried out.The Experiment results are consistent with those of theory,which shows that L（0,1） is applicable to the nondestructive testing of full-length-bonding resin bolts.

关 键 词：锚杆 超声导波 锚固质量 无损检测 衰减 

分 类 号：TU318[建筑科学—结构工程]