Factors affecting the dynamic response of pre-stressed anchors after transient excitation

作     者：Xu Huijun Li Qingfeng 

作者机构：School of Materials Science and Engineering China University of Mining ＆ Technology Xuzhou 221008 China Shenhua Group Corporation Limited Beijing 100011 China School of Energy and Safety Engneering Hunan University of Sdence and Technology Xianootan 411201 China 

出 版 物：《Mining Science and Technology》 (矿业科学技术（英文版）)

年 卷 期：2011年第21卷第3期

页      面：395-399页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：Financial support for this work  provided by the National Natural Science Foundation of China (No.50874104) 

主　　题：Support plate effectContact stressPre stressed anchorDynamic response 

摘      要：The wide application of pre-stressed bolting technology in coal mine tunnels has made the nondestructive stress wave reflection method of determining bolting quality an important one. The effect of the support plate on the dynamic response of the pre-stressed anchor is of particular interest. A theoretical analysis and numerical simulations are used to identify the factors affecting the contact stress between the support plate and the rock wall. A formula allowing the calculation of contact stress is presented. Stress wave propagation through the nut, support plate, and rock wall are predicted. The dynamic response signals were measured in the field using prestressed anchors pre-tightened to different torques. The effects from the support plate on the dynamic response were recorded and the results compared to the predictions of pre-stressed anchor. This work provides a theoretical reference for the signal processing of dynamic reflected wave signals in anchor bolts.