水下浅埋小净距隧道施工相互影响的力学行为研究

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摘要为便于连接两岸的既有道路和节约用地，穿越城市江河的水下隧道可考虑采用小净距隧道的型式。在水下小净距隧道施工期间，双孔隧道施工的相互影响是决定隧道稳定性的关键因素之一。依托一采用矿山法施工的水下浅埋小净距公路隧道——长沙市湘江大道浏阳河隧道，对双孔隧道施工的相互影响进行研究。首先，利用三维有限元法计算双孔隧道开挖掌子面间的合理纵向间距；然后，在施工期间，系统测试两相邻隧道的围岩孔隙水压力、围岩压力、钢拱架和二次衬砌内力、锚杆轴力、隧道地表沉降、拱顶下沉、洞周收敛、河水水位等；最后，基于现场监测结果，从双孔隧道施工相互影响的角度，分析隧道围岩和支护系统的变形及受力特点。研究结果可为类似工程的设计、施工和监测提供参考。

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关键词 ：隧道工程, 水下隧道, 小净距, 浅埋暗挖, 相互影响, 掌子面间距, 现场测试

Abstract：In order to save land and link the existing roads on the banks conveniently，the underwater tunnels with small spacing may be designed to cross the river. During the period of construction of the underwater tunnels with small spacing，the constructing interaction of the twin tunnels is the key factor affecting the stability of the tunnel engineering. Based on the Liuyanghe tunnel which is the underwater small-distance road tunnels by shallow-burying and hidden-digging method，the constructing interaction of the twin tunnels is studied. Firstly，the three-dimensional finite element model is established to analyze the reasonable lagging distance between the twin tunnel excavated faces. Then，the pore water pressure，surrounding rocks pressure，internal force in steel arch and secondary lining，the axial force of anchor，ground surface settlement，crown settlement，convergence and water level are monitored during the period of construction. At last，based on the measured data，the deformation and stress properties of surrounding rocks and supporting system are analyzed；and the mechanical characteristics of constructing interaction between the twin tunnels are also studied. The experiences and conclusions presented can provide design，construction and monitoring references for similar projects.

Key words： tunnelling engineering underwater tunnel small clear spacing shallow underground excavation interaction excavation faces distance field test

收稿日期: 2010-01-28

引用本文:

岳健，冷伍明，赵春彦. 水下浅埋小净距隧道施工相互影响的力学行为研究[J]. 岩石力学与工程学报, 2011, 30(S1): 3043-3051.
YUE Jian，LENG Wuming，ZHAO Chunyan. STUDY OF MECHANICAL BEHAVIOURS OF CONSTRUCTION INTERACTION FOR SHALLOW UNDERWATER TUNNELS WITH SMALL CLEAR SPACING. , 2011, 30(S1): 3043-3051.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/3043

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