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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2009, Vol. 28 ›› Issue (4): 685-688.DOI: 10.3969/j.issn.1674-0696.2009.04.12

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小净距公路隧道施工力学效应研究

徐林生   

  1. 重庆交通大学土木建筑学院,重庆400074
  • 收稿日期:2009-04-29 修回日期:2009-05-19 出版日期:2009-08-15 发布日期:2015-04-15
  • 作者简介:徐林生(1964—),男,浙江桐乡人,教授,博士,主要从事隧道与地下工程的教学、科研工作。E-mail:Xulinsheng128@126.com。

Mechanical?Effect?of?Neighborhood?Highway?Tunnel?Construction

XU Linsheng   

  1. School?of?Civil?Engineering?＆?Architecture,?Chongqing?Jiaotong?University,?Chongqing?400074,?China
  • Received:2009-04-29 Revised:2009-05-19 Online:2009-08-15 Published:2015-04-15

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摘要： 通过有限元数值模拟,分析了小净距公路隧道中夹岩柱的受力特性、围岩屈服接近度、锚杆轴力、二次衬砌混 凝土内力特征等。研究结果表明:净距较小为B/3时,研究区中夹岩柱围岩会受到左右双洞开挖应力场重叠作用 的严重影响,受力状态十分不利,屈服区也贯通中夹岩柱,中夹岩柱两侧的隧道支护衬砌结构都应有所加强;当净 距为(0??85~1??5)B时,中夹岩柱受力状态受净距的影响已很小。

关键词: 小净距隧道, 施工力学, 围岩, 支护衬砌结构, 数值模拟

Abstract: Adopting?the?FEM?numerical?simulation,?the?mechanical?characteristics?of?middle?rock?pillar,?the?approach?degree?of?surrounding?rock?yielding,the?bolt?axial?force?and?the?internal?force?of?secondary?lining?structure,?etc.?are?elaborated.?The?results?demonstrate?as?follows：?when?the?clear?distance?equals?B/3,?the?mechanical?behavior?of?middle?rock?pillar?is?adverse,?because?it?is?severely?affected?by?the?overlapping?effect?of?the?excavation?stress?field?from?left?and?right?holes;the?yielding?district?can?cut?across?middle?rock?pillar,?and?the?supporting-lining?structures?around?the?middle?rock?pillar?should?be?strengthened.?With?the?clear?distance?at?the?range?from?0.?85B?to?1.5B,the?mechanic?state?of?middle?rock?pillar?is?little?influenced?by?the?clear?distance.

Key words: neighborhood tunnel , construction mechanics , surrounding rock , supporting and lining structure , numerical simulation ;

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