锚杆锚固体系中的波系特征研究

采用凝固过程中的混凝土模拟不同物理力学特性的锚固介质,用数值模拟和试验的方法研究了锚固锚杆中的波系及锚固锚杆中界面波的形成过程。数值模拟和试验模拟都表明随着锚固介质力学性质的改变锚杆中传播的波的特性发生改变。锚杆中传播的P波对锚固介质的力学特性非常敏感,随着锚固强度的增加,界面波产生,P波逐渐衰减消失。锚杆中传播的波由原来的P波占主导成为界面波占主导,波在锚固段的传播速度也由杆速度成为界面波波速。界面波的波速与锚固介质的力学性质相关,因此可以用界面波的波速来评价锚杆锚固质量以及计算锚杆锚固段长度。

Study on wave propagation characteristics of rock bolt grouted structure

Numerical simulation and experimental testing are used to research the wave propagation characteristics and the forming procedure of interfacial wave in grouted rock bolt during embedded concrete curing.Both show the wave propagation characteristics will change with concrete curing.The P-wave in the grouted rock bolt is very sensitive to mechanical characteristics of embedded material,and with the increasing of concrete strength it will disappear.When the strength of concrete get harder interfacial wave will form and dominate;the velocity of interfacial wave is related to embedded material so it can be used to measure grouted quality of rock bolt as well as grouted length.