大断面浅埋黄土隧道锚杆作用效果的试验研究

›› 2008, Vol. 29 ›› Issue (2): 491-495.

大断面浅埋黄土隧道锚杆作用效果的试验研究

谭忠盛¹，喻渝²，王明年³，杨建民²

1. 北京交通大学土建学院，北京 10004；2. 铁道第二勘察设计院，成都 610031；3.西南交通大学，成都 450000

收稿日期:2007-09-15 出版日期:2008-02-11 发布日期:2013-07-10
作者简介:谭忠盛，男，1963年生，博士，教授，博导，主要从事隧道及地下工程方面的研究工作。
基金资助:
铁道部重大科技研发计划资助项目（No. 2005K001–D(G)–2）

Experimental study on bolt effect on large section shallow depth loess tunnels

TAN Zhong-sheng¹, YU Yu², WANG Ming-nian³, YANG Jian-min²

1. School of Civil Engineering and Architecture，Beijing Jiaotong University，Beijing 100044，China； 2. The Second Survey and Design Institute of China Railway, Chengdu 610031, China; 3. Southwest Jiaotong University, Chengdu 610031，China

Received:2007-09-15 Online:2008-02-11 Published:2013-07-10

摘要/Abstract

摘要： 黄土隧道系统锚杆的作用效果问题一直是争论的焦点。结合正在修建的郑州—西安铁路客运专线大断面黄土隧道，采用现场对比试验方法对系统锚杆作用效果进行研究。为了使试验结果有可比性，选取试验条件基本相同的贺家庄隧道洞身段作为试验段，分别设置有系统锚杆段40 m和无系统锚杆段40 m。对比试验的内容包括：拱顶下沉、拱脚下沉、水平收敛、围岩压力、初支钢架应力、锚杆轴力等。试验结果表明，有系统锚杆段比无系统锚杆段的拱顶沉降大40 %左右、水平收敛大25 %左右，两者的土压力和钢架应力相差不大；锚杆轴力较小，且拱部受压。经综合分析认为，拱部锚杆的支护效果不明显，取消拱部锚杆可减少施工工序，加快隧道初期支护断面及早封闭，能更好地控制支护沉降与变形，并节约工程投资。

关键词: 大断面隧道, 黄土隧道, 锚杆, 对比试验

Abstract: It has been a focus of debate for a long time how the system bolts act on the loess tunnel. Associating with the large section loess tunnel of the building Zhengzhou-Xi’an high-speed passenger rail lines, we have done many in site contrast testing to evaluate the effect of system bolt. For the good comparability of the testing result, we’d choose the tunnel which has the similar test condition. In this case, we take the Hejiazhang Tunnel as our experimental section in which we set system bolt section and non-system bolt section both for 40 meters. The main contrast experiences are the settlement of the tunnel crown and arch foot, horizontal convergence, surrounding rock pressure, the stress of initial supporting steel framework, axial force of bolt, etc. The testing results indicate: the section with system bolt has more 40% of the settlement in the tunnel crown and more 25 % horizontal convergence than the one without system bolt; there are little difference in the soil pressure and steel framework stress between the two sections; there is less axial force in the bolt and the part of arch is pressed. Through comprehensive analysis, we make the conclusion that there is little improvement of supporting effect in the crown bolt, so we suggest canceling the bolt to induce the construction procedure and quicken the enclosed of the initial supporting section of the tunnel. It will be helpful to control the supporting settlement and deformation and it also reduces the investment cost.

Key words: large cross section tunnel, tunnel in loess, bolt, contrast testing

中图分类号:

U 459

谭忠盛，喻渝，王明年，杨建民 . 大断面浅埋黄土隧道锚杆作用效果的试验研究[J]. , 2008, 29(2): 491-495.

TAN Zhong-sheng , YU Yu , WANG Ming-nian , YANG Jian-min . Experimental study on bolt effect on large section shallow depth loess tunnels[J]. , 2008, 29(2): 491-495.

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