Analytical model of fully grouted bolts in pull-out tests and in situ rock masses
Analytical model of fully grouted bolts in pull-out tests and in situ rock masses
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DOI：
10.1016/j.ijrmms.2018.11.015
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发表时间：
2019-01-01
影响因子：
7.2
通讯作者：
Zhang Peng-hao
中科院分区：
文献类型：
--
作者：
Zou Jin-feng;Zhang Peng-hao
研究了轴向拉荷载作用下锚杆与岩体界面黏结强度的动态演化特征，以及考虑锚杆周边围岩应力不均匀的全注浆锚杆原位力学行为。提出了一种描述锚杆-岩石界面黏结强度动态演化特征的动态黏结-滑动模型。在此基础上，建立了考虑自由端滑移的锚杆剪切应力分布、荷载-位移关系和相对位移的解析解。在此基础上，考虑围岩沿锚杆方向的非均匀法向应力，给出了全注浆锚杆的剪应力分布和荷载-位移特性。此外，还提出了确定原位预应力和非预应力锚杆沿锚杆应力分布和岩石变形的解析方法。所提出的模型和解析解分别通过实验室模型试验和现场试验公布的结果得到验证。新的解析解完成了解决全注浆锚杆在抽拔试验和原位岩体中的基本问题的理论框架，并提供了一个有用的理论工具，可以潜在地应用于锚杆设计、实验室和原位试验。
The dynamic evolution characteristic of the bond strength at the interface of a bolt and a rock mass under an axial tensile load and the mechanical behavior of fully grouted bolts in situ were investigated considering the non-uniform stress of the surrounding rock along the bolts. A new dynamic bond-slip model was first proposed to describe the dynamic evolution characteristic of the bond strength at bolt-rock interfaces. Based on the proposed dynamic bond-slip model, analytical solutions of the shear stress distribution along the bolts, load-displacement relationship, and relative displacement considering the slip of the free end were developed. Then, incorporating the non-uniform normal stress of the surrounding rock along the bolts, the shear stress distribution and load-displacement behavior of the fully grouted bolts were presented. Moreover, analytical approaches were also proposed for determining the stress distribution along the bolt and rock deformation in cases of in situ prestressed and non-prestressed bolts. The proposed model and analytical solution were validated by published results from laboratory model tests and in situ tests, respectively. The new analytical solution completes the theoretical framework for addressing the fundamental problem of fully grouted bolts in pull-out tests and in situ rock masses and provides a useful theoretical tool that can potentially be applied to bolt design and laboratory and in situ testing.