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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 carry out fast and effective non-destructive testing of the anchorage quality of concrete anchors with different anchorage conditions, the transient dynamic response of concrete anchors was studied based on the low strain stress wave reflection method. Through free, complete and different density anchors The analysis of the waveform characteristics of the acceleration response curve of the rod and the judgment of the anchoring quality show that the waveform of the free anchor is very regular and the attenuation of the stress wave is very small and the bottom of the anchor has many obvious reflection, complete and defective anchors Of the solid end of the reflection is obvious and the bottom reflection is weak, the anchoring medium for the concrete rock bolt waveform characteristics than the anchor medium for the mortar anchor rule, more accurately determine the concrete anchor length of the anchor, defect position and density Parameters, a more realistic reflection of the actual anchor bolt state.