不同因素对立体交叉隧道施工的影响规律分析  

Analysis of Factors Affecting Intersected Tunnel Construction

作　　者：李玉峰[1,2] 雷明锋[1] 鲁贵卿 黄国富 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中国建筑第五工程局有限公司,长沙410004

出　　处：《现代隧道技术》2014年第1期117-123,共7页Modern Tunnelling Technology

基　　金：国家重点基础研究发展计划资助项目(973:2011CB013802);国家自然科学基金高铁联合基金重点项目(U1134208);国家自然科学基金资助项目(50808176;51108461);中国建筑第五工程局有限公司项目(2011)

摘　　要：针对围岩级别、交叉角度和岩柱高度3个影响因素,设计100个试验工况进行数值建模计算,分别从新建隧道施工引起的既有隧道拱顶沉降和初期支护内力变化两方面探讨了该3种因素对立体交叉隧道施工的影响规律。研究结果表明:受新建隧道下穿施工的影响,既有隧道拱顶沉降和喷混凝土轴力均有增大的趋势,且随交叉角度的增大,增幅更为显著;当立体交叉隧道岩柱高度增加、围岩变差时,引起的既有隧道拱顶沉降变化加大,而喷混凝土轴力的增大比率反而逐渐减小。可见对于立体交叉隧道而言,既有隧道结构变形为较敏感的物理量,可作为施工设计的重点考察指标。Considering the three factors of rock classification, crossing angle, and rock pillar height, 100 cases were assumed to implement numerical modeling calculation and the law of the three factors affecting construction of intersected tunnels was discussed regarding crown settlement and internal force change of the primary support in an existing tunnel. Study results show that crown settlement and shotcrete axial force present a trend of significantly increasing with the enlargement of the crossing angle. When the rock pillar height increases and rock mass is poor, the induced crown settlement of the existing tunnel becomes larger while the increasing rate of the shotcrete axial force becomes smaller. The structural deformation of existing tunnels can be used as a key review indicator during the design and construction of intersected tunnels.

关 键 词：立体交叉隧道 影响因素 数值模拟 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]