【摘 要】
：
由于预应力的影响,煤矿预应力锚杆的振动特性与非预应力锚杆截然不同,通过理论分析、数值模拟和现场实测,分析了预应力锚杆弹性波检测的激振及其振动特性.采用理论分析和数值
【机 构】
：
中国矿业大学煤炭资源与安全开采国家重点实验室矿业工程学院,山西潞安矿业集团,
论文部分内容阅读
由于预应力的影响,煤矿预应力锚杆的振动特性与非预应力锚杆截然不同,通过理论分析、数值模拟和现场实测,分析了预应力锚杆弹性波检测的激振及其振动特性.采用理论分析和数值模拟方法分析了预应力锚杆锚固体波速的影响因素,得出了锚固体波速计算公式;并分析了激振应力波在预应力锚固系统内的传播规律.预应力和锚固体黏结强度大小不仅影响反射波形态及峰值大小,而且影响锚固体内次生反射的产生.以一现场预应力锚杆为对象,实测了不同预紧力时的预应力锚杆动力响应信号,验证了理论分析和数值模拟结果的正确性.
Due to the influence of prestress, the vibration characteristics of prestressed anchor in coal mine are different from those of non-prestressed anchor. Theoretical analysis, numerical simulation and field measurement are used to analyze the vibration and vibration characteristics of prestressed anchor. The theoretical analysis and numerical simulation are used to analyze the influencing factors of the wave velocity of the prestressed anchor. The calculation formula of the wave velocity of the anchor is obtained. The propagation of the wave in the prestressed anchorage system is analyzed. The size of the bond strength not only affects the shape and peak size of the reflected wave, but also affects the generation of secondary reflections in the anchorage.An on-site prestressed anchor is taken as an object to test the dynamic response of the prestressed anchor with different preload, The theoretical analysis and the numerical simulation results are correct.
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