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根据锚杆与锚固浆之间界面耦合机理,分析了岩锚抗拔状态下界面剪应力的分布特征。基于变形协调得出小荷载情况下界面剪应力随离锚固受力点距离的增大成指数衰减,并随荷载增加,界面出现4个变形段,分离段和残余变形段随着塑性区开展产生非耦应力向远端传递。耦合区界面剪应力分布与小荷载情况不同,其相关模量参数可采用综合折减系数表示。同时本文提出了单孔多锚杆受力剪应力衰减模型,并通过试验证示了现场锚杆在荷载逐级加大时,剪应力峰值强度的变化规律。
According to the mechanism of interface coupling between anchor bolt and anchor grouting, the distribution characteristics of interfacial shear stress are analyzed. Based on the deformation coordination, the interfacial shear stress decreases exponentially with the increase of the distance from the anchorage force point under the condition of small load. With the increase of load, there are 4 deformation sections in the interface, and the separation section and the residual deformation section occur along with the plastic zone Coupling stress is transmitted to the distal end. The shear stress distribution at the interface of the coupling zone is different from that of the small load, and the relevant modulus parameters can be expressed by the comprehensive reduction factor. At the same time, this paper presents a single hole multi-anchor force shear stress attenuation model, and demonstrated by the test site in the bolt load step by step, the peak shear stress intensity changes.