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浅埋并行近距离隧道的设计施工是盾构隧道研究中的难点。针对间距对管片内力影响的问题,建立了包括地层、等代层、衬砌的有限元计算模型,并通过工程算例验证了该模型的合理性。然后计算隧道间距、埋深、土体参数等因素对隧道周围土体应力、管片内力的影响。根据土体应力结果可知,净距的减小使两隧道的卸载区相互接近或重叠,使两隧道之间土体承受较大荷载,发生屈服,从而使管片内力增大。根据管片内力结果得到了不同情况下管片最大内力提高率,得知埋深和土体黏聚力对提高率的影响较弱,土体内摩擦角的影响较为显著,并给出了各种情况下管片内力设计值提高率的取值大小。最后综合分析结果,针对浅埋并行超近距离隧道问题,给出了设计施工建议。
The design and construction of shallow buried parallel short-distance tunnel is a difficult point in the research of shield tunnel. Aiming at the problem of the influence of the spacing on the internal force of the pipe slice, a finite element calculation model including formation, equivalent layer and lining was established. The rationality of the model was verified through an engineering example. Then calculate the tunnel spacing, depth, soil parameters and other factors on the soil around the tunnel stress, the impact of the internal force. According to the result of soil stress, the decrease of clear distance makes the unloading areas of two tunnels approach or overlap with each other, so that the soil between the two tunnels can withstand large loads and yield, so that the internal force of the tube increases. According to the result of the internal force of the pipe, the rate of increase of the maximum internal force of the pipe under different conditions is obtained. It is found that the influence of the depth of the soil and the cohesion of the soil on the rate of increase is weak and the internal friction angle of the soil is significant. In the case of the internal force of the design value of the chip to increase the value of size. At the end of the paper, the design and construction suggestions are given based on the results of the comprehensive analysis.