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煤矿巷道锚杆轴向受力是衡量其工作状态的重要指标,现有的检测手段尚不能有效对锚杆轴力状态进行随机、快速的无损检测。基于结构动力学原理,建立了锚杆轴向受力与锚固系统横向固有频率间的关系,并借助于专用的电液伺服锚杆拉力试验系统,测定了锚杆直径、锚固状态、围岩条件对锚固系统横向振动频率、锚杆轴向受力的影响规律。结果表明:锚杆锚固系统的横向振动频率与锚杆轴向受力具有很好的相关性;围岩性质是影响系统横向振动频率的主要因素之一;锚杆锚固系统的振动频率与锚杆轴向受力间可用对数函数关系描述。开发了锚杆轴向受力的无损检测技术,现场应用结果证明了该项技术对巷道锚杆轴向受力实施随机、无损检测的可行性。
Axial axial load of coal mine roadway bolts is an important index to measure its working status. The existing detection methods can not effectively carry out random and rapid nondestructive testing of bolt axial force state. Based on the principle of structural dynamics, the relationship between the axial force of anchor rod and the transverse natural frequency of the anchoring system was established. With the aid of a dedicated electro-hydraulic servo-bolt tension test system, the bolt diameter, anchoring condition, surrounding rock conditions Influence of transverse vibration frequency of anchor system and axial stress on anchor rod. The results show that the lateral vibration frequency of the anchor system has a good correlation with the axial stress of the anchor rod. The nature of the surrounding rock is one of the main factors affecting the lateral vibration frequency of the system. The vibration frequency of the anchor system is similar to that of the anchor rod Axial force can be described by a logarithmic function. The non-destructive testing technology of axial stress of rock bolts was developed. The field application results prove the feasibility of this technique for random and nondestructive testing of axial stress of rock bolts.