论文下穿黄河盾构隧道管片衬砌结构受力特征模型试验是适合不知如何写黄河方面的相关专业大学硕士和本科毕业论文以及关于黄河传说论文开题报告范文和相关职称论文写作参考文献资料下载。
摘 要：針对兰州地铁穿河段盾构隧道穿越强透水砂卵石地层和承受较高外水压的特点,首先研制了外水压加载装置,该装置在衬砌模型内部创造了一个封闭的负压环境,通过控制模型内外气压差来实现外水压的等效加载,同时结合隧道地层复合模拟试验系统开展了几何相似比为1∶10的室内模型加载试验,实现了土压和水压的分别控制加载.研究了水压、土压、土体侧压力系数及拼装方式对管片受力特征的影响.研究结果表明,随着水压的增大,管片轴力明显提高,弯矩略有减小,偏心距则明显降低；随着隧道上覆土压的增大,管片衬砌结构的轴力、弯矩、偏心距均呈增大趋势,但总体上量值变化较小；在水压一定时,覆土厚度的增加对管片弯矩的影响越来越大,而轴力变化速率均比较稳定；正常水压条件下,随着土体侧压力系数的增大,管片衬砌结构的轴力增大,弯矩减小,偏心距减小,随着水压的增大,侧压力系数对于管片结构受力特征的影响越来越小；错缝拼装情况下,管片内力在部分环向及纵向接头处会产生较大突变,且管片内力较通缝拼装情况大.
关键词：水下盾构隧道；砂卵石地层；管片衬砌；模型试验
中图分类号：U452 文献标志码：A
文章编号：1674-2974（2017）05-0132-11
Abstract：The shield tunnel of Lanzhou metro undercrossing the Yellow River was driven under through high permeability sandy cobble stratum and under high water pressure. A device for external loading test was therefore developed, which introduced a controllable air pressure between the linings and grouting layer, and by regulating the pressure difference, the equivalent water pressure can be then simulated. Using this device together with a tunnel-ground simulation facility, a model test with a geometric similarity ratio of 1∶10 was conducted. The device can reach the point that the water pressure and earth pressure were controlled separately. The mechanical characteristics of segment lining with different external water pressures, soil pressure, coefficient of side earth pressure and segment assembling methods was analyzed. The results suggest that, as external water pressure increased, a significant increasing trend of axial force and a gentle decrease trend of bending moment were observed while eccentricity decreased obviously； as soil pressure increased, a gentle increase of axial force, bending moment and eccentricity was observed； Given a fixed water pressure, increasing effects on the bending moment and decreasing effects on axial force were shown with the increase of soil pressure； Given a normal pressure level, axial force of segment linings increased while bending moment decreased when the coefficient of side earth pressure increased, which made the eccentricity decrease. In addition, the coefficient of side earth pressure shows decreasing effects on the mechanical characteristics of segment linings with the increasing of water pressure； Under staggered assembling, internal force of the segment will produce a mutation at some parts of circumferential and longitudinal joints, besides, internal force of the segment under staggered assembling is larger than that under straight joint assembling.
Key words：underwater shield tunnel； sandy cobble stratum； tunnel linings； model scale experiments
总结:此文是一篇黄河论文范文,为你的毕业论文写作提供有价值的参考。
参考文献：
1、 隧道盾构法施工中的测量技术 摘 要：地下工程盾构施工测量的主要目的是使盾构机能够沿设计轴线前进，确保盾构隧道准确贯通。盾构法施工中的测量工作主要分为三个部分：地上控制测量、。
2、 自动监测系统在盾构下穿既有铁路路基工程中应用 摘 要：在地铁盾构隧道穿越既有铁路线路工程的施工过程中，对既有铁路线路实施变形监测是确保铁路运营安全的重要措施之一。文章以长春地铁1号线盾构下穿。
3、 盾构隧道防水保障措施与病害处理 【摘 要】管片自防水和接缝防水是盾构隧道防水的关键，密封垫是接缝防水的主要防线。论文针对隧道防水问题，详细讨论了盾构管片与密封垫成品质量检验标准。
4、 失谐周期盾构隧道结构弯曲波动局部化 摘要： 针对随机失谐周期接头盾构隧道结构的波动局部化特性进行了研究。将盾构隧道模拟为弹性地基上通过环间接头连接的周期管梁模型，基于弹性地基上均匀。
5、 水下隧道盾构法施工组织设计 摘 要：制定科学经济的施工组织方案对水下隧道各项施工活动的全过程进行科学管理、统筹兼顾非常关键。本文通过分析影响水下隧道盾构法施工组织的控制性因。
6、 对土压平衡盾构施工风险管理分析 摘 要：随着我国经济发展速度的不断加快，城市化进程的速度也在不断的加快，这就使得城市出行压力加大，为此，建设地铁已经成为现阶段城市发展中重要规划。