浅埋并行隧道间距对管片内力影响的分析  

IMPACT ANALYSIS OF TWIN-TUNNELS SPACE ON INTERNAL FORCES IN LINING

作　　者：宋锦虎[1,2] 缪林昌[1] 徐政 王军 

机构地区：[1]东南大学岩土工程研究所,南京210096 [2]河南城建学院土木与材料工程系,河南平顶山467044 [3]无锡市轨道交通规划建设(指挥部)办公室,江苏无锡214043

出　　处：《工业建筑》2012年第1期110-116,84,共8页Industrial Construction

基　　金：江苏省"六大人才高峰"项目资助

摘　　要：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 twin tunnels are key questions in the study of shield tunnel.To obtain the influence of spaces on internal forces in lining,the model including layer,equivalent circle zone and lining was established.At first,the model was checked by calculating the field monitored data,and it was confirmed the one was relible and reasonable.Then the impact of space,covered depth and soil parameters on the soil stress and the internal forces in the lining were calculated.From the results of soil stress,it could be obtained that the unloading areas of tunnels come to overlap and the stress of the soil between the twin tunnels increased while the space decreased,then the internal forces was increased.From the result of the internal forces,the improving ratios of the maximal internal forces under various conditions were obtained.And the results showed that the impact of covered depth and the cohesion of soil on the improving ratio was little and the impact of the internal friction angle was notable.Then the improving ratio of design value of the maximal internal forces in the lining under various conditions was given.At last,with the comprehension of analysis results,some design and construction suggestions were given for the problems in shield twin tunnels.

关 键 词：浅埋隧道 近距隧道 间距 管片内力 

分 类 号：U451[建筑科学—桥梁与隧道工程]