岩石锚杆锚固段荷载分布试验研究

岩石锚杆锚固段荷载分布规律是岩土锚固技术的关键问题之一。在拉拔试验锚杆杆体测点应变数值采集的基础上,利用复合幂函数和高斯函数对实测数据进行曲线拟合,获得了临界破坏状态下的锚固段轴力及剪应力分布情况。试验结果表明:岩石锚杆锚固段剪应力的分布集中在锚固段的前部;高斯函数可以较好地描述临界破坏状态下锚杆杆体的轴力分布;界面破坏出现在界面峰值抗剪强度远大于界面所能提供的黏结强度情况下。研究结果为锚杆的设计与计算提供了理论依据。

Experimental study of load distribution of anchoring section for rock bolts

The load distribution of anchoring section for rock bolt is one of the key problems in rock-soil anchoring technology. Firstly, the strain of measuring points in the body produced in tension test is acquired. Then the data is fitted into curve with composite power function and Gauss function. Finally the axial and shear stress distribution of anchoring section under critical failure state is obtained. The experiment results show that the shear stress is distributed in the front part of bolts; the axial stress distribution is better described by Gauss function for anchoring section under critical failure state; and the damage emerges in the plane where shear strength is much larger than bond strength. The study results provide a theoretical basis for the design of bolt in rock-soil anchoring.