岩土力学2011，Vol.32Issue(4)：1223-1228,6.
扭转导波在锚固锚杆中传播的数值模拟
Numerical simulation of torsional guided wave propagation in grouted rock bolt
摘要
Abstract
Numerical simulation was conducted to study the propagation propenies of torsional guided wave in grouted rock bolts.Finite element models of a free bolt and a grouted bolt were established; and torsional guided waves with frequencies of 20-60 kHz were excited at the top of the bolts.The numerical results of guided wave velocities in the free bolt and in the anchoring section of the bolt agree well with the theoretical results.The result proves that the finite element method is an effective way to simulate torsional guided wave propagation in grouted rock bolts.The results of numerical simulation show that both the attenuation values of torsional guided waves in the free bolt and in the anchoring section of the bolt increase linearly with the increase of excited wave frequency.Meanwhile, the reftection amplitude of guided waves from the upper interface of the grouted rock bolt decreases.Torsional guided waves attenuate greatly in the anchoring section of the bolt; and reflected waves from the embedded end of bolt are not able to be captured; as a result, torsional guided waves are not applicable for bolt length testing.When the elastic modulus of grout material increases.the amplitude of upper interface reflected wave increases; so the upper interface reflected wave can be used to evaluate the elastic modulus of grout material.关键词
扭转导波/数值模拟/锚固锚杆/上界而反射波Key words
torsional guided wave/ numerical simulation/ grouted rock bolt/ upper interface reflected wave分类
数理科学引用本文复制引用
何文,王成,王海菠,宁建国..扭转导波在锚固锚杆中传播的数值模拟[J].岩土力学,2011,32(4):1223-1228,6.基金项目
国家自然科学基金项目(No.10972040.No.10632080) （No.10972040.No.10632080）
教育部新世纪优秀人才支持计划资助项目(No.NCET-08-0043). （No.NCET-08-0043）
