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全长粘结锚杆锚-浆界面应力的分布规律
宋洋1, 王贺平2, 许怀玉2, 张维东2
1.辽宁工程技术大学 建筑与交通学院, 辽宁 阜新 123000;2.辽宁工程技术大学 土木工程学院, 辽宁 阜新 123000
摘要:
在局部变形理论基础上,对全长粘结型锚杆锚-浆界面破坏类型的锚固机理进行分析研究。将注浆体与围岩视为相对位移为零的稳定体,通过确定其主要影响系数r、ks分析得到锚-浆界面的剪应力与轴向荷载的双曲线应力分布形式。通过Flac 3D数值模拟技术和实验算例对其进行对比分析,证明其合理性。定义虚拟系数T用来描述锚杆与注浆体界面材料性质,并对其影响参数进行分析,发现锚杆长度在一定范围内可以增强锚固效果,但过度增加锚杆长度对杆体剪应力与轴向荷载影响较小;随着锚杆半径增大,锚浆界面剪应力峰值呈非线性减小,作用的范围增加,为避免产生应力集中现象,应避免使用半径较小的锚杆;虚拟系数T可以描述锚浆界面的相差度,T值增大,锚浆界面的剪应力增大,作用的均匀度及轴向荷载作用范围降低明显,可通过取合适的T值使锚固效果最佳。T值对锚杆锚固机制的影响较为明显。
关键词:  双曲线模型  全长粘结型锚杆  虚拟系数  锚固
DOI:10.11835/j.issn.2096-6717.2019.070
分类号:U455
基金项目:国家自然基金(5150412、51174268);辽宁省教育厅一般项目(LJYL057)
Analysis of stress distribution patten along the anchor-slurry interface of full-length bond anchor
Song Yang1, Wang Heping2, Xu Huaiyu2, Zhang Weidong2
1.College of Architecture and Transportation, Liaoning Technical University, Fuxin 123000, Liaoning, P. R. China;2.Civil Engineering College, Liaoning Technical University, Fuxin 123000, Liaoning, P. R. China
Abstract:
Based on the local deformation theory, the anchorage mechanism of anchor-grout interface failure type is analyzed and studied. The grouting body and surrounding rock mass regarded as a whole with zero relative displacement. The stress distribution of the shear stress and axial load on anchor-grout interface is obtained by determining its main influential coefficient (r and ks). Via the comparison between the numerical simulations by Flac 3D and the experimental results, the rationality of this method was verified. A virtual coefficient T is used to describe the interface properties of the bolt and the grouting body and its influence is analyzed. The results show that the anchoring effect can be enhanced by increasing the length of the anchor in a certain range. However, excessive increase of the bolt length has marginal effect on shear stress and axial load. With increase of the anchor radius, the shear stress peak of the anchor surface is non-linearly reduced and range of action is increased. To avoid stress concentration, the anchor rod with small radius should be avoided. The virtual coefficient T can reveal the difference degree of anchor grouting interface. With the increase of T, the shear stress on the anchor grouting interface increases, while the homogeneous degree of the stress and the action length of the axial load reduce. By taking appropriate T value the anchoring effect is best. The effect of T value on the anchoring mechanism of bolt is significant.
Key words:  hyperbolic model  full-length bonded bolt  virtual coefficient  anchorin
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