锚杆系统低应变动力响应的模型试验研究  

Models Experimental Study on Low Strain Dynamic Response of Anchorage Bolt System

作　　者：陈建功[1] 张永兴[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《工程勘察》2007年第3期68-73,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金项目(50378096);教育部科学技术重点项目(03138)

摘　　要：在实验室制作了完整锚杆和不同缺陷锚杆系统模型,利用小锤锤击和超声波两种手段进行了室内模型实验,得到了相应的测试结果。通过分析认为,完整锚杆和有不同缺陷锚杆的时域响应曲线和频谱曲线有较明显的差别。用小锤激发的方式,由于各种因素的影响,杆底及缺陷反射信号不明显;而用超声波激发的方式,信号的噪声较小,杆底反射信号较明显,但缺陷处反射波较难判断。完整锚杆反射波的能量集中在较窄的频带上,而缺陷锚杆分布在较宽的频带上。The simplified models of anchorage system with different damage conditions are made in laboratory and the corresponding dynamic response curves, which are excited by hammer blow and ultrasonic, are obtained. The time-domain response curves and frequency-domain response curves are very different among these models. In hammer blow excitation way, the reflected signals of bar bottom and impaired of some influencing factors. In ultrasonic excitation way, the reflected signals loci can not be identified because of bar bottom are obvious and the reflected signals of defects are not obvious. The reflected energy of undamaged bolt is distributed in a narrow frequency range and that of damaged bolt is distributed in a wide frequency range.

关 键 词：锚杆 动力响应 模型试验 

分 类 号：TU4[建筑科学—土工工程]