一种大尺度让压锚杆特性分析及其应用研究

发布时间：2018-05-25 15:23

本文选题：大尺度让压锚杆 + 软岩大变形　；参考：《隧道建设》2017年03期

【摘要】：随着众多深、大、长隧道的建设,软岩挤压性大变形问题日益突出。让压锚杆是一种治理大变形问题的有效手段。介绍大尺度让压锚杆的结构及支护过程,并采用ANSYS软件验证大尺度让压锚杆弹性变形、滑动让压、杆体受拉3阶段的工作特性。采用基于Hoek隧洞挤压预测经验公式的概率分析方法和ABAQUS软件分别对让压锚杆的让压力和让压量研究,结果表明:1)锚杆让压力存在下限值,岩体抗压强度越高,下限值越低;2)让压量增大到一定程度后,再增加相同的让压量,二次衬砌压力降幅减小。利用大尺度让压锚杆的受拉阶段,实现"边支边让,先柔后刚",可有效控制围岩大变形,提高隧洞的长期稳定性。
[Abstract]:With the construction of many deep, large and long tunnels, the problem of squeeze deformation of soft rock is becoming more and more prominent. It is an effective method to deal with the problem of large deformation. This paper introduces the structure and supporting process of large scale pressure-bearing bolt, and uses ANSYS software to verify the working characteristics of three stages: elastic deformation, sliding pressure and tensile stress. The probability analysis method based on the empirical formula of Hoek tunnel extrusion prediction and the ABAQUS software are used to study the concession pressure and the yield pressure of the concession bolt, respectively. The results show that the lower the pressure of the anchor rod is, the higher the compressive strength of the rock mass is. The lower limit value is, the lower the pressure is, and the lower the pressure is, the lower the secondary lining pressure is when the pressure is increased to a certain extent. The large deformation of surrounding rock can be effectively controlled and the long-term stability of tunnel can be improved by making use of the tensile stage of large-scale pressure-anchoring bar to realize "side support and transfer, first soft and then rigid".
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【分类号】：U455.71

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