Effect of a preload force on anchor system frequency  

作　　者：Lu Aihong Xu Jinhai Liu Haishun 

机构地区：[1]State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining & Technology [2]School of Mechanics and Civil Engineering, China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》2013年第1期135-138,共4页矿业科学技术学报（英文版）

基　　金：the financial support from the National Basic Research Program of China (No. 2013CB227900);the China Postdoctoral Science Foundation (No. 20110491483);the State Key Laboratory of Coal Resources and Mine Safety(No. 10F08)

摘　　要：The interrelationship between preload forces and natural frequencies of anchors was obtained from the structure of an anchor and its mechanical characteristics. We established a numerical model for the dynamic analysis of a bolt support system taking into consideration the working surroundings of the anchor. The natural frequency distribution of the system under various preload forces of the anchor was analyzed with ANSYS. Our results show that each order of the system frequency varied with an increase in preload forces. A single order frequency decreased with an increase in the preload force. A preload force affected low-order frequencies more than high-order frequencies. We obtained a functional relationship by fitting preload forces and fundamental frequencies, which was in agreement with our theretical considerations. This study provides theoretical support for the detection of preload forces.The interrelationship between preload forces and natural frequencies of anchors was obtained from the structure of an anchor and its mechanical characteristics. We established a numerical model for the dynamic analysis of a bolt support system taking into consideration the working surroundings of the anchor. The natural frequency distribution of the system under various preload forces of the anchor was analyzed with ANSYS. Our results show that each order of the system frequency varied with an increase in preload forces. A single order frequency decreased with an increase in the preload force. A preload force affected low-order frequencies more than high-order frequencies. We obtained a functional relationship by fitting preload forces and fundamental frequencies, which was in agreement with our theretical considerations. This study provides theoretical support for the detection of preload forces.

关 键 词：Frequency Preload force Anchor detection Numerical simulation 

分 类 号：TD353.6[矿业工程—矿井建设]