混凝土锚杆的瞬态动力响应实验研究  

Experimental Study of Transient Dynamic Response on Bolts in Concrete

作　　者：孙冰[1,2] 曾晟[2] 丁德馨[1,2] 蒋炳炎[2] 喻清[2] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]南华大学核资源与核燃料工程学院,湖南衡阳421001

出　　处：《采矿与安全工程学报》2010年第2期244-248,共5页Journal of Mining & Safety Engineering

基　　金：湖南省教育厅项目(09C854);衡阳市科技局项目(2007KG037)

摘　　要：为了对不同锚固状态的混凝土锚杆的锚固质量进行快速、有效的无损检测,基于低应变应力波反射法进行了混凝土锚杆的瞬态动力响应实验研究.通过自由、完整及不同密实度缺陷锚杆的加速度响应曲线的波形特征进行分析和锚固质量判断,得出自由锚杆的波形十分规则、应力波衰减程度很小且锚杆的底端有多次十分明显的反射,完整及缺陷锚杆的固端反射明显而底端反射微弱,锚固介质为混凝土的锚杆的波形特征不如锚固介质为砂浆的锚杆的规则,较准确地判断出混凝土锚杆的锚固长度、缺陷位置以及密实度等参数,较真实的反映锚杆实际锚固状态.In order to testing bolts in concrete quickly and effectively,an experiment was conducted to study the transient dynamic response on bolts in concrete based on the stress wave reflection method.The waveform characteristic of acceleration response curves for free bolt,integrated bolt,and defective bolts with different compactness was analyzed and the anchorage integrity of defective bolts with different compactness evaluated.The results show that the waveform of the free bolt is very regular,the attenuation degree of stress is slight while the multiple bottom reflection is very obvious;in addition,the fixed end reflection of integrated bolt and defective bolts is obvious but the bottom reflection is weak;further more,the waveform characteristic of the bolt grouted by mortar is more regular than that by concrete;finally,the grouted length,defect position and compactness of the bolts in concrete are accurately judged,well reflecting the anchoring state of the bolts.

关 键 词：采矿工程 混凝土锚杆 瞬态动力响应 锚固质量 

分 类 号：TD353[矿业工程—矿井建设]