一种大尺度让压锚杆特性分析及其应用研究

doi:10.3973/j.issn.1672-741X.2017.03.010

隧道建设（中英文） ›› 2017, Vol. 37 ›› Issue (3): 321-329.DOI: 10.3973/j.issn.1672-741X.2017.03.010

一种大尺度让压锚杆特性分析及其应用研究

杨喻声^{1, 2}

(1. 同济大学地下建筑与工程系，上海 200092； 2. 同济大学岩土及地下工程教育部重点实验室，上海 200092）

收稿日期:2016-09-19 修回日期:2016-11-22 出版日期:2017-03-20 发布日期:2017-03-30
作者简介:杨喻声（1993—），男，重庆忠县人，同济大学土木工程专业在读博士，研究方向为隧道及地下结构。Email： ysyang@tongji.edu.cn。

Study of Performance and Application of Yielding Anchor  Bolt with Large Allowable Deformation

YANG Yusheng^{1, 2}

Study of Performance and Application of Yielding Anchor  Bolt with Large Allowable Deformation

Received:2016-09-19 Revised:2016-11-22 Online:2017-03-20 Published:2017-03-30

摘要/Abstract

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。

关键词: 大尺度让压锚杆, 软岩大变形, Hoek经验公式, 让压力, 让压量

Abstract:

The large squeezing deformation of soft rock can not be ignored under the rapid development of tunnel construction. As a result, yielding anchor bolt becomes more and more important in large deformation control. The structure and support mechanism of a new type of yielding anchor bolt with large allowable deformation are introduced. And then the performances of the anchor bolt during elastic deformation phase, sliding yielding phase and tensile phase are verified by ANSYS software. Finally the yielding pressure and yielding deformation of the anchor bolt are analyzed by probit analysis based on Hoek formula and ABAQUS software respectively. The results show that: 1) The lower limit exists in yielding pressure of the anchor bolt; and the higher the compressive strength of rock mass is, the smaller the lower limit of anchor bolt is. 2) The decreasing amplitude of secondary lining decreases when the yielding deformation of anchor bolt reaches a certain value. The concept of “supporting while yielding and flexible support goes first and then rigid support” can be realized; large deformation of surrounding rocks can be controlled effectively; and the longterm stability of the tunnel can be improved during the tensile phase of yielding anchor bolt with large allowable deformation.

Key words: yielding anchor bolt with large allowable deformation, large deformation of soft rock, Hoek formula, yielding pressure, yielding deformation

中图分类号:

U 455.7+2

杨喻声. 一种大尺度让压锚杆特性分析及其应用研究[J]. 隧道建设, 2017, 37(3): 321-329.

YANG Yusheng. Study of Performance and Application of Yielding Anchor  Bolt with Large Allowable Deformation[J]. Tunnel Construction, 2017, 37(3): 321-329.

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一种大尺度让压锚杆特性分析及其应用研究

Study of Performance and Application of Yielding Anchor  Bolt with Large Allowable Deformation

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