›› 2016, Vol. 37 ›› Issue (7): 2047-2055.doi: 10.16285/j.rsm.2016.07.028

• 岩土工程研究 • 上一篇    下一篇

让压锚杆在大变形隧道支护应用中试验研究

张 彪,张志强,汪 波,周 立   

  1. 西南交通大学 交通隧道工程教育部重点实验室 土木工程学院,四川 成都 610031
  • 收稿日期:2015-10-30 出版日期:2016-07-11 发布日期:2018-06-09
  • 通讯作者: 张志强,男,1968年生,教授,工学博士、博士后,博士生导师,主要从事隧道及地下工程的研究工作。E-mail: clarkchang68@163.com E-mail:zhangbiao1016@163.com
  • 作者简介:张彪,男,1990年生,博士研究生,主要从事隧道工程方面的研究工作。
  • 基金资助:

    国家自然科学基金(No. 51478396, No. 51278427)。

Experimental study of application of yielding bolt to large deformation tunnel

ZHANG Biao,ZHANG Zhi-qiang,WANG Bo,ZHOU Li   

  1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
  • Received:2015-10-30 Online:2016-07-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51478396, 51278427).

摘要: 锚杆在支护大变形隧道工程时常因变形过大而发生拉断破坏,为推广可延伸性锚杆在大变形隧道中的应用,提出了恒阻挤压滑移让压锚杆,通过挤压并拉伸锚杆杆体来消耗高地应力引起的围岩形变能量,实现让压功能;通过调整挤压套的位置、握裹力,可以依据具体大变形隧道工程的围岩特性,调节让压锚杆的让压荷载、最大让压量。通过室内试验,证明了恒阻挤压滑移让压锚杆让压装置可靠性,获得了恒阻挤压滑移让压锚杆力学特性。以兰渝线毛羽山隧道为应用工程,试验结果表明:让压锚杆在大变形隧道工程中可以保证可靠的让压效果;在软弱不良大变形隧道工程中,宜采用注浆等手段以保证让压锚杆的有效支护性能;让压锚杆可以有效控制围岩变形,保证大变形隧道中围岩的收敛效果。

关键词: 让压锚杆, 大变形隧道, 支护特征曲线, 现场试验

Abstract: In large deformation tunnel, the supporting bolt tensile failure occurrs frequently due to the excessive deformation. In order to extend the application of the bolt in large deformation tunnel, a yielding bolt with constant resistance and extrusion slip is developed. It realizes the function of yielding by extruding and stretching the bolt to consume the energy of surrounding rock deformation caused by high ground stress. By adjusting the position and grip of the extrusion sleeve, the yielding pressure and the maximum yielding distance can be adjusted based on the specific characteristics of the surrounding rock in large deformation tunnel engineering. Through the indoor experiment, it has proved that the yielding bolt with constant resistance and extrusion slip is reliable. The mechanical characteristic of the yielding bolt is obtained. The yielding bolt is applied to the Maoyu tunnel engineering at Lanzhou-Chongqing railway, the experimental results show that the yielding bolt in large deformation tunnel engineering can exert an effect of yielding support reliably, but in soft rock tunnel with large deformation, the grouting and other means should be used to guarantee the yielding bolt effective support. Yielding bolt can effectively control the deformation of surrounding rock, and ensure the convergence effect of large deformation of surrounding rock in tunnel.

Key words: yielding bolt, large deformation tunnel, supporting characteristic curve, in situ experiment

中图分类号: 

  • U 45

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