软弱围岩大断面隧道掌子面锚杆加固参数研究

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英文篇名：Study on Bolt of Face Rock for Large Cross-section Tunnel in Weak Surrounding Rock 作者：冯红卫 ; 赵利媛 英文作者：FENG Hongwei;ZHAO Liyuan;School of Civil Engineering and Architecture, Xinxiang University; 关键词：软弱围岩 ; 玻璃锚杆 ; 挤出变形 ; 加固措施 英文关键词：soft rock;;glass fiber bolts;;extrusion deformation;;reinforce measures 中文刊名：GYAF 英文刊名：Industrial Safety and Environmental Protection 机构：新乡学院土木工程与建筑学院; 出版日期：2019-05-10 出版单位：工业安全与环保 年：2019 期：v.45 基金：陕西省教育厅专项科研计划项目(15JK2054) 语种：中文; 页：GYAF201905011 页数：4 CN：05 ISSN：42-1640/X 分类号：47-50

摘要

软弱围岩隧道的开挖施工容易造成开挖面失稳坍塌以及拱顶沉降过大等事故,须对围岩和掌子面进行加固,以保证施工安全。以宁波象山县野猪山隧道为工程背景,以新意法为理论基础,采用玻璃纤维锚杆加固隧道掌子面,通过数值分析研究了掌子面锚杆布置密度、加固长度、搭接长度等加固参数,得出掌子面玻璃纤维锚杆加固长度应大于隧道开挖直径,可提高掌子面的稳定性;对掌子面挤出变形控制较为严格的情况下,可以对全断面布置锚杆进行加固。
        The excavation of soft surrounding rock tunnel is easy to cause the instability of excavation face and large ground settlement and it is necessary to ensure the construction safety by reinforcement the surrounding rock and tunnel face. In this paper, taking Yezhushan tunnel in Xiangshan country of Ningbo city as the engineering background, using ADECO-RS as the theoretical basis, and glass fiber bolts to reinforce the tunnel face, the parameters of tunnel face reinforcement such as laying density of the bolt, the reinforcement length of bolt and the lap length, are obtained by finite element analysis and theoretical analysis. It is found that, the length of the reinforcement of the glass fiber anchor of the face should be greater than the tunnel excavation diameter, which can improve the stability of the surface, and in the case of tightening control of the extrusion of the face, it is possible to reinforce the whole section of the anchor. The conclusions can be used as references for soft rock tunnel construction.

引文

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