【摘要】 根据煤矿锚杆的结构和受力特点,建立锚杆横向振动的力学简化模型,分析得到锚杆固有频率、长度和预紧力等参量间的相互关系;并针对锚杆的实际工作环境,建立锚杆支护系统动力分析的数值计算模型,应用ANSYS软件分析得到不同预紧力作用下锚杆支护系统固有频率的分布特征。结果表明:预紧力锚杆以横向振动为主,系统各阶自振频率随锚杆预紧力的增大而增大,且锚杆预紧力改变对锚固系统的低阶频率影响比对高阶频率更大,并给出预紧力与系统基频之间的拟合函数,该函数与理论分析结果基本相符。研究结果为锚杆的预紧力检测提供了理论依据。更多还原

【Abstract】 According to the structure and mechanical characteristics of rock-bolts,the simplified mechanical model of anchor transverse vibration was established,and the interrelationship among such parameters as the natural frequency,length,and preload forces of anchors was analysed and obtained.In view of the actual working environment of anchors,a numerical calculation model was established for dynamic analysis of the bolt support system,and the distribution characteristics of the natural frequency of anchor support system under different preload forces was analyzed with the software of ANSYS.The results have shown that transverse vibration is the main form of movement for anchor with preload force,the natural frequency in each order of the system increases with the preload force F;the effect of change in preload force on low-order frequencies is greater than that on high-order frequencies of the anchor system;moreover,the fitting function between the preload force and fundamental frequency was given,which is in basic agreement with the results of theoretical analysis.This paper provides theoretical support for the detection of the preload force.更多还原