摘要
为了研究锚杆锚固质量声波反射法检测中的声波传播规律,制作了不同长度的锚杆实验模型,同时建立了与之对应的三维有限元数值模型,对锚固体中的动力响应问题进行了研究。实验检测结果与数值模拟结果都表明,随着锚杆长度的增加,响应波形趋于规则,底端反射波幅值逐渐减小,锚固体系中的固结波速也随之减小,反射波的能量衰减随之增大。通过对实验检测结果与数值模拟结果进行对比分析,得出了响应波形曲线随锚杆长度的变化规律,并获得了锚杆固结波速及反射波能量衰减与锚杆长度的关系。
In order to study the propagation law of sonic wave in sonic reflection method for detecting the rock bolted quality,experimental bolt models of different lengths were fabricated,also 3D FEM simulation models were established for comparison,and the dynamic responses of anchorage body were studied.The results of the experiments and the numerical simulations show that,with increase of the lengths of the anchorage bolts,the acceleration response signal at bolt head tend to be regular,while bottom reflection amplitudes gradually decrease,the consolidating wave velocity of the bolt anchoring system also gradually decreases,the energy attenuation of reflected wave is increase.By comparative studies on the results,we obtain the relation between response waves′ variation tendency and the bolts length,and also get the relationship between consolidating wave speed of bolt anchoring system,energy attenuation of reflection wave and the anchorage bolts length.
出处
《人民长江》
北大核心
2011年第3期95-98,111,共5页
Yangtze River
基金
国家重点基础研究发展计划"973"项目(2011CB710600)
中央级公益性科研院所基金项目(CKSF2010018)
关键词
锚杆
质量检测
声波反射法
实验模拟
数值模拟
anchorage bolt
quality check
sonic reflection method
experimental simulation
numerical simulation
作者简介
尹健民，男，教授级高级工程师，主要从事岩土工程研究工作。E—mail：yinjml63@163．com
