全长黏结式注浆锚杆侧摩阻力分布实用简便计算

Practical and convenient calculation of frictional resistance distribution of full-length bonded grouting

提供一种全长黏结式注浆锚杆侧摩阻力分布的简化计算方法。对工作中的锚杆进行分段分析,计算假定分段锚杆侧面摩阻力均匀分布。根据锚杆体、注浆体及岩土体三者间的受力及变形传递关系,推导出锚杆侧摩阻力分布的2重级数表达式。结合已有研究文献进行实例验证,结果表明:锚杆侧摩阻力分布从底部到端部大致呈2重级数曲线分布,靠端部长度的40%抵抗了张拉荷载的85%以上。该法得出的结果与文献计算结果具有较好的一致性,验证了其可行性及精确性。在此基础上,分析锚杆分段数、锚杆直径、锚杆弹模以及土体抗剪刚度对计算结果的影响。该法简单实用,应用于完全黏结注浆锚杆侧摩阻力的分析具有一定的可行性及实用性,为多类型锚杆工程计算提供一种新的方法。

A simplified method for calculating the frictional resistance of the grouting bolt at full length is proposed.The bolts at work are segmented and analyzed to calculate the even distribution of the lateral friction of the assumed segmented anchor.According to the relationship between the stress and deformation of the bolt body,the grouting body and the rock and soil body,the expression of the double order series of the friction resistance distribution of the bolt side is deduced,the results show that the distribution of the resistance at the side of the bolt is approximately two-order series from the bottom to the end,which is more than 85%of the tensile load by 40%of the length of the end.The results of this method are in good agreement with the results of literature,and the feasibility and accuracy are verified.On this basis,the influence of the number of bolts,the diameter of bolt,the elastic modulus of anchor and the shear stiffness of soil are analyzed.The method is simple and practical,and it is feasible and practical to analyze the frictional resistance of grouting bolt.It provides a new method for multi-type bolt engineering calculation.