特大跨度连拱隧道施工工序的关键块体理论优化分析

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摘要基于概率统计方法以不同的节理采集区域为单位，对特大跨度双向八车道金鸡山连拱隧道中导洞施工中出露的岩体节理进行精细化采集与描述，在此基础上，利用关键块体理论分析隧道正洞施工过程中可能产生的最危险关键块体。对比分析不同开挖与锚喷支护顺序对关键块体安全系数的影响，对隧道施工工序进行优化分析。结果表明：在金鸡山隧道正洞施工过程中，隧道侧壁产生的块体基本能够自稳，而隧道顶部则可能产生体积较大的关键块体；采用双侧壁导坑法施工时，优先开挖支护单个洞室的右侧导坑则能够减小施工过程产生关键块体的数目与体积。研究结果为特大跨度双向八车道金鸡山连拱隧道的安全施工提供指导。

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关键词 ：隧道工程, 连拱隧道, 岩体节理, 精细化描述, 关键块体, 锚喷支护, 施工工序

Abstract：According to different joint collecting areas，the revealed rock joints are collected and described finely during construction of central drift of Jinjishan multi-arch tunnel with eight traffic lanes based on the probabilistic method. Then the key block theory is adopted to predict the possible unstable blocks during construction progress of the main tunnel. In the meanwhile，the geometric and mechanical parameters of the key blocks are defined to analyze the influences of construction procedure on the unstable blocks. Furthermore，by comparing and analyzing the safety factor of the key blocks in different construction procedures，the design optimization analysis is performed. The results show that：(1) During the construction procedure of the main tunnel of Jinjishan multi-arch tunnel，the blocks located in the side surrounding rock mass are stable. (2) The key blocks with considerable volume in the top surrounding rock mass may be formed. (3) The numbers and the volumes of the key blocks may decrease in the construction procedure with excavating the right side drift first of the double-side drift method. The research results provide guidance for safety construction of Jinjishan multi-arch tunnel with eight traffic lanes.

Key words： tunnelling engineering multi-arch tunnel rock joint fine description key block bolt-shotcrete support construction procedure

收稿日期: 2010-01-20

引用本文:

陈孝湘1，2，夏才初1，3，卞跃威1，3，许崇帮1，3. 特大跨度连拱隧道施工工序的关键块体理论优化分析[J]. 岩石力学与工程学报, 2011, 30(S1): 2979-2985.
CHEN Xiaoxiang1，2，XIA Caichu1，3，BIAN Yuewei1，3，XU Chongbang1，3. OPTIMIZATION ANALYSIS BY KEY BLOCK THEORY FOR CONSTRUCTION PROCEDURE OF EXTRA LARGE-SPAN DOUBLE-ARCH TUNNEL. , 2011, 30(S1): 2979-2985.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/2979

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