厦门翔安海底隧道穿越二长岩脉关键技术  

Key Construction Technology for Construction of Xiamen Xiang′an Subsea Tunnel across Monzonlite Vein

作　　者：王彦清 

机构地区：[1]中铁二十二局集团有限公司,北京100043

出　　处：《铁道工程学报》2013年第7期53-58,79,共7页Journal of Railway Engineering Society

摘　　要：研究目的:厦门翔安海底隧道是我国大陆第一条海底隧道。厦门翔安海底隧道服务隧道穿越二长岩脉时,地质条件复杂,易发生突水,涌泥,坍塌等事故,是该工程施工的难点之一,也是以往海底隧道施工过程中未曾遇到过的,没有现成的施工经验可供借鉴。在施工过程中一定要采取切实可行的开挖方法,支护方案,并配合超前地质预报和监控量测,才能确保施工安全,快捷。研究结论:(1)通过切实可行的超前地质预报,获得准确的地质情况,然后通过FLAC3D数值模拟对比选取台阶法施工的开挖方案,为施工方便选择上台阶高度为6 m,根据地层变形控制和隧道稳定性控制,借助FLAC3D数值模拟调整出合理的开挖进尺为2 m,合理的台阶长度为10 m;(2)为了达到强度和稳定性,耐久性的要求,厦门翔安隧道服务隧道采用复合衬砌;(3)针对二长岩脉段,通过对拱顶下沉和洞内收敛的监控量测验证方案的合理性和具体措施的有效性;(4)厦门海底隧道的关键技术是集合了开挖,支护,地质预报和监控量测的综合技术系统,可以为以后海底隧道穿越二长岩脉段或者风化围岩的施工提供参考。Research purposes： The Xiamen Xiang＇an Subsea Tunnel is the first subsea tunnel built in the China mainland. As the geological conditions were complex, the accidents of water and mud bursting and the collapse easily happened when the service tunnel of the Xiamen Xiang＇an Subsea Tunnel crossed monzonite veins. It was one of the difficult points in construction and it also never been met in the previous tunnel construction. Therefore, there was no construction experience to draw. During the construction process, the feasible excavation methods and supporting program had to be used along with the advanced geological prediction, monitoring and measurement in order to ensure the safe and fast construction. Research conclusions： （ 1 ） By making the feasible geological prediction, the accurate geological situation was obtained. By making the FLAC3D numerical simulation and comparison of the excavation schemes with bench method, the 6m step height was easily chosen. Based on the controls of the stratum deformation and tunnel stability, the reasonable 2 m excavation footage was adjusted with the help of the FLAC3D numerical simulation, and the reasonable step length was 10m. （2） In order to meet the requirements of the strength, the service tunnel of the Xiamen Xianghn Tunnel. （3） For stability and durability, the composite lining was adopted to the monozonite veins section, by monitoring and measuringthe subsidence of the crown and the convergence of the cave, the rationality of the scheme and the effectiveness of specific measures were verified. （4） The key technology system of the excavation, support, geological prediction and monitoring and measuring for the Xiamen Subsea Tunnel can provide the reference to construction of submarine tunnel across monozonite veins section or weathered rock section.

关 键 词：海底隧道 二长岩脉 台阶法 超前地质预报 

分 类 号：U45[建筑科学—桥梁与隧道工程]