Experimental Study on Bond-Slip Behavior of Bamboo Bolt-Modified Slurry Interface under Pull-Out Load
Experimental Study on Bond-Slip Behavior of Bamboo Bolt-Modified Slurry Interface under Pull-Out Load
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DOI：
10.1155/2018/6960285
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发表时间：
2018-02
影响因子：
1.8
通讯作者：
W. Lu;Dong Zhao;Xiao-fei Mao;Y. Ai
中科院分区：
文献类型：
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作者：
W. Lu;Dong Zhao;Xiao-fei Mao;Y. Ai
本文通过26个现场轴向拉拔试验，对竹锚杆-水泥浆界面进行了分析，旨在揭示界面在断裂模式下的力学行为。采用相同的竹材和改性砂浆材料，分析了锚固长度、锚杆直径和锚杆孔直径三个影响因素。结果表明：锚固体系的控制界面是锚杆与锚固剂之间的界面，界面的局部行为经历了弹性、软化、摩擦和解耦4个阶段。分析了锚固界面滑移、应力、应变沿着锚轴向的分布规律和变化趋势。结果表明，这种界面存在有效锚固长度极限，完全解耦现象不容忽视。通过对现有粘结滑移模型与界面粘结滑移曲线的对比分析，同时考虑应变滑移曲线与三线性粘结滑移模型的对应关系，提出了修正的三线性粘结滑移模型。该模型的摩擦段是有限的，完全解耦段的剪应力为零。
This paper presents an analysis of bamboo bolt-modified slurry interfaces based on 26 in situ axial pull-out tests intended to highlight the mechanical behavior of interface under a fracture mode. Three impact factors are analyzed: anchorage length, bolt diameter, and bolt hole diameter, using the same materials of bamboo and modified slurry. The result shows that the interface between the bamboo bolt and anchoring agent is the control interface of an anchorage system, and the local behavior of the interface involves four stages: elastic, soften, friction, and decoupling. Distribution law and change trend of slippage, stress, and strain of anchoring interface along with the axial direction of an anchor bolt were analyzed. The result shows that there is effective anchoring length limit in this kind of interface, and that the complete decoupling phenomenon should not be neglected. Through a comparative analysis of the existing bond-slip model and interface bond-slip curve, and considering the correspondence of the strain-slip curve and trilinear bond-slip model simultaneously, a modified trilinear bond-slip model has been proposed. The friction section of this model is limited, and shearing stress in the complete decoupling section is zero.