郑西客运专线铁路张茅隧道近饱和黄土体初期支护应力变形特征研究

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摘要黄土的特性是其工程性质受含水量的影响很大，郑西客运专线铁路张茅隧道穿越含水量20%的近饱和黄土体，施工难度大。通过系统分析张茅隧道的施工地质条件，确定具有针对性的隧道开挖步序。针对施工需要快速封闭开挖面的特点，结合隧道断面规模特征，研究三维非接触变形观测方法，对开挖后初期支护的拱顶下沉和两壁收敛等特征变形量进行现场长期测试；结合布置在初期支护上的土压力盒与表面应变计的测试，对初期支护的土压力特征和表面接触力特征进行研究，获得近饱和黄土体在三台阶七步开挖条件下的变形和应力特征，总结出该类开挖施工方法下黄土隧道初期支护的极限变形量指标特征，为类似工程提供参考。

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关键词 ：隧道工程, 近饱和黄土体, 隧道开挖, 初期支护, 变形, 应力

Abstract：Engineering properties of loess is affected obviously by moisture content. Zhangmao tunnel of Zhengzhou—Xi?an passenger railway is through nearly saturated loess with the moisture content of 20%，which is very difficult for construction. The construction geological condition of Zhangmao tunnel is analyzed and the result is made to determine the excavation method. The special excavation method is studied and a specific step of the tunnel continued excavation is given. The excavation technology needs for rapid closure of the construction cutting face. According to the tunnel design，this tunnel has a very large size excavation section. So the three-dimensional non-contact deformation observation methods are studied in order to get information fastly. The characteristics of crown settlement and the two walls convergence after the initial support of the excavation are tested in site for a long time. Combined with earth pressure cells and strain gauge testing on the surface of the initial support，the characteristics of soil pressure and surface contact force on the initial support are studied. The characteristics of deformation and stress of initial support on the condition of seven-step excavation in three steps of nearly saturated loess are obtained. The limit deformation amount characteristics of initial support of the loess tunnel under this kind of tunnel excavation method are summarized and it can be a reference for similar projects.

Key words： tunnelling engineering nearly saturated loess tunnel excavation initial support deformation stress

收稿日期: 2010-12-29

引用本文:

张爱军1、2，白明洲1，许兆义1，霍玉华2，鲍海荣2，雷军2，杜衍庆1. 郑西客运专线铁路张茅隧道近饱和黄土体初期支护应力变形特征研究[J]. 岩石力学与工程学报, 2011, 30(S2): 3714-3720.
ZHANG Aijun1，2，BAI Mingzhou1，XU Zhaoyi1，HUO Yuhua2，BAO Hairong2，LEI Jun2，DU Yanqing1. STUDY OF STRESS AND DEFORMATION CHARACTERISTICS OF ZHANGMAO NEARLY SATURATED LOESS TUNNEL INITIAL SUPPORT OF ZHENGZHOU—XI?AN PASSENGER RAILWAY. , 2011, 30(S2): 3714-3720.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS2/3714

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