锚杆粘结力分布和灌浆体剪移刚度的研究

锚杆的抗拔力计算式是岩土锚固工程设计中的一个关键技术问题.锚杆灌浆体的剪移刚度是锚杆粘结强度计算的关键参数,一直没有解决.工程实践和研究表明,锚固段的内力沿杆长分布是不均匀的,杆体轴力和剪力集度均向根部衰减.本文利用锚杆、灌浆体和围岩共同变形的理论,研究锚固力和剪力集度沿锚杆的分布,并与现场实验结果相比较.本文还对灌浆体切向剪切刚度计算方法进行讨论.

Bond strength distribution of the fully grouted cable bolts and grout''''s shearing stiffness

Bearing capacity of fully grouted cable bolts is very impotent element of support and reinforcement structure design. The observation shows that the shear stress distribution on the bolt is not uniform, and also shows that bolt, grout and rock displacement under loading are all relevant parameters in the development of bolt-grout-rock interface displacement. The paper presents the prediction of shear stress distribution on the bolt using bolt-grout-rock cooperative displacement, and also shows how to deal with the grout shear stiffness coefficient which is the key point to bolt design.