浅埋下穿高速公路黄土隧道管棚变形监测及受力机制分析

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摘要依托郑西客运专线阌乡隧道，开展浅埋大跨黄土隧道长大管棚受力机制的研究。对隧道进入下穿高速公路前的管棚纵向变形进行监测，根据实测结果分析长大管棚在隧道开挖过程中的受力特性与作用机制；建立浅埋暗挖黄土隧道管棚受力的双参数地基梁模型，对长大管棚受力机制进行分析。计算结果与实测结果有较好的一致性。研究结果表明：掌子面前方约15 m处管棚开始受力，掌子面过后约15 m处管棚的受力趋于稳定，管棚的纵向变形总体上呈凹槽形分布，掌子面处管棚受力最大；同时，管棚变形与开挖面位置、开挖进尺、管棚及岩体物性指标等因素有密切关系。研究结果为隧道下穿段管棚工法及施工方案的优化设计提供理论依据，并在下穿段沉降监测中得到验证。

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关键词 ：隧道工程, 浅埋暗挖, 下穿施工, 黄土隧道, 管棚, 变形监测, 受力机制

Abstract：Wenxiang tunnel is a shallow large-span loess tunnel in Zhengzhou—Xi′an Special Passenger Railway；and the mechanical behaviors of big pipe-roof are studied. The longitudinal deformations of the pipe-roof before the underpass section are monitored by strain gauges fixed in the pipe-roof. Based on the monitoring results，the mechanical behaviors and function mechanism of long scale pipe-roof are thoroughly analyzed. Furthermore，a new double-parameter elastic foundation beam model of pipe-roof in shallow tunnels is build and its boundary condition gets analyzed. By model calculating with deflection curve equation and calculation of longitudinal strain，the evaluation of mechanical behaviors of the pipe-roofs in Wenxiang tunnel is performed successfully. The measured values and the calculation results are consistent well. The research results show that：(1) In front of the excavating face about 15m，the pipe roof starts to bear the load；and after the excavating face about 15 m，its force tends to be stable. The longitudinal deformation of the whole pipe-roof is groove-shaped distribution and its largest force is at the excavating face. (2) Simultaneously，the results also indicate that the mechanical behaviors of pipe-roof relate to the location of the excavation face，the footage of the tunnelling cycle，the mechanics parameter of both pipe-roof itself and surrounding rock，and so on. (3) The conclusions from calculation model can be used as theory basis in the design parameter optimization of construction and the construction scheme selection of pipe-roof；and the application effect has been verified in deformation monitoring at underpass section.

Key words： tunnelling engineering shallow buried mining undercrossing construction loess tunnel pipe-roof deformation monitoring；mechanical behavior

收稿日期: 2010-05-20

引用本文:

李健1，谭忠盛1，喻渝2，倪鲁肃1. 浅埋下穿高速公路黄土隧道管棚变形监测及受力机制分析[J]. 岩石力学与工程学报, 2011, 30(S1): 3002-3008.
LI Jian1，TAN Zhongsheng1，YU Yu2，NI Lusu1. ANALYSIS OF DEFORMATION MONITORING AND MECHANICAL BEHAVIORS OF BIG PIPE-ROOF FOR SHALLOW-BURIED LARGE-SPAN TUNNEL TO UNDERPASS HIGHWAY. , 2011, 30(S1): 3002-3008.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/3002

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