膨胀型浆体注浆锚杆拉拔力学特性及损伤失效机制研究

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摘要为增强锚杆锚固效果，在浆体中加入膨胀剂，开展普通浆体与膨胀型浆体锚固对比试验，监测注浆体发育过程中径向应力变化，并进行锚杆拉拔试验以及锚杆拉拔数值模拟，从而探究锚杆拉拔过程中力学特性及损伤失效机制。结果表明：(1) 经过约60 h的发育后，膨胀型注浆体最大可产生2.34 MPa的径向应力并保持稳定，相比于普通注浆体，膨胀型注浆体锚固后，锚杆的极限抗拔力增加了21.3%；(2) 在较低拉拔荷载时，杆–浆界面剪应力沿锚固深度逐渐减小，拉拔荷载较高时，杆–浆界面剪应力先增大再快速衰减，剪应力峰值主要分布于孔口附近；(3) 相比于普通注浆锚杆，膨胀型浆体的挤压作用使得界面黏结程度更大，界面剪应力较高且分布更均匀，在相同拉拔荷载时，浆体损伤较少，表现出更好的握裹性能，使得膨胀型浆体注浆锚杆承载性能大幅提升。

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	谈博海1
	姚囝1
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	杜键3
	孙明伟3
	刘海4
	关文超1

关键词 ：桩基工程, 螺纹钢锚杆, 注浆锚杆, 膨胀型浆体, 拉拔力学特性

Abstract：In order to enhance the anchoring effect of grouted bolts，the expansive agent was added into the slurry. A comparative anchoring test was carried out between the ordinary slurry and the expansive slurry to monitor radial stress changes during grouting body development. Subsequently，a bolt pull-out test was conducted to determine the ultimate pullout force of the bolt. The study employed Abaqus numerical simulation software to construct a refined model of a rebar bolt，incorporating transverse ribs. Numerical simulation tests were conducted to analyze the mechanical characteristics and failure mechanisms of the bolt following anchoring with different grouting materials. The results indicate that：(1) Following approximately 60 hours of development，the expansion type grouting body can exhibit a maximum radial stress of 2.34 MPa while maintaining stability. In comparison with the ordinary type grouting body，the ultimate pullout force of the bolt increases by 21.3% after anchoring with the expansion type grouting body. (2) When the drawing load is low，the interfacial shear stress gradually decreases along the anchoring depth. Conversely，under high drawing loads，the interfacial shear stress initially increases before rapidly decreasing，the peak shear stress is mainly distributed near the orifice. (3) In comparison with ordinary grouting bolts，the extrusion action of expansion type grouting results in a higher degree of interface bonding and more evenly distributed interface shear stress. This leads to reduced damage to the grouting body and improved gripping performance under the same tensile load，significantly enhancing the bearing capacity of expansion type grouting bolts. To enhance the anchoring effect the anchor bolts，an expansive agent was added to the slurry，and a comparative test was conducted between the ordinary slurry and the expansive slurry. The radial stress changes during the development of the slurry was monitored，and the pull-out test and numerical simulation of the anchor bolts were carried out to investigate the mechanical properties and failure mechanism of the anchor bolts during the pull-out process. The results show that：(1) After about 60 hours of development，the expansive slurry can generate a radial stress of up to 2.34 MPa and remains stable. Compared with the ordinary slurry，the ultimate pull-out resistance of the anchor bolts increased by 21.3% after anchoring with the expansive slurry. (2) The shear stress at the anchor bolt-mortar interface decreases gradually with the depth of anchoring at low pull-out load，and the shear stress increases first and then rapidly decreases at high pull-out load. The peak shear stress is mainly distributed near the hole mouth. (3) Compared with the ordinary mortar anchor bolts，the expansive slurry has a greater compressive effect，resulting in a higher interface adhesion，higher shear stress distribution，and more uniform distribution. Under the same pull-out load，the grouting damage is less，showing better clamping performance，which greatly improves the bearing capacity of the expansive slurry anchor bolts.

Key words： pile foundation rebar steel bolt grouting bolt expansive slurry mechanical properties of pulling

引用本文:

谈博海1，姚囝1，2，杜键3，孙明伟3，刘海4，关文超1. 膨胀型浆体注浆锚杆拉拔力学特性及损伤失效机制研究[J]. 岩石力学与工程学报, 2024, 43(12): 3058-3069.
TAN Bohai1，YAO Nan1，2，DU Jian3，SUN Mingwei3，LIU Hai4，GUAN Wenchao1. Study on mechanical characteristics and damage failure mechanisms of expansion type grouted bolts. , 2024, 43(12): 3058-3069.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I12/3058

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