全长锚固锚杆的托板效应

EFFECTS OF THE BACKING PLATE OF A WHOLLY GROUTED ROCK BOLT

托板是锚杆的重要组成部分,分析锚杆的作用机理时,托板效应不可忽视.本文首先建立了托板与围岩相互作用模型,推导了托板反力表达式,着重分析了托板对全长锚固锚杆内力分布的影响,并用现场实测资料给予检验.结果表明,现场实测和理论分析结果是较为一致的,从而得出了对全长锚固锚杆作用机理的进一步认识.

Effects of the backing plate cannot be neglected when analysing the operation mechanism of rock bolts because it is an important part of rock bolts. This paper has established a model for the interaction between the backing plate and the surrounding rock, derived the expression for the reaction exerted by the backing plate, emphatically analysed the influence of the backing plate on the stress distribution in a wholly grouted rock bolt and verified the analytical results by comparing them with the data of in-situ observation. The result of comparison indicates that the observational values and the result of theoretical analysis are fairly consistent with each other. Through the present study, a further understanding about the operation mechanism of wholly grouted rock bolts is achieved.