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近接隧道施工影响分析与评价方法研究

发布时间:2018-06-28 14:24

  本文选题:近接隧道施工 + 近接度 ; 参考:《武汉理工大学》2014年硕士论文


【摘要】:随着国民经济不断跃升,铁路建设迎来了前所未有的发展机遇期。铁路近接隧道施工作为隧道施工中技术难度较大的施工类型,愈发频繁的出现在各个交通建设工地上。同时,其伴生的各种安全隐患所引发的问题也越来越多。面对施工进度紧迫、安全保障任务重、社会关注度高等问题,国内外专家纷纷开展近接隧道施工的相关研究。 论文以福平线近接隧道施工为背景,针对福平线隧道施工地质情况复杂,,施工手段多样,安全隐患突出的特点,从近接隧道施工力学机理和围岩应力变化规律出发,开展近接隧道施工影响分析。借助LabVIEW虚拟仪器软件平台,开发了近接隧道施工风险评价系统。论文特色及主要工作包括以下几个方面: (1)运用弹塑性力学中的管壁理论,将近接施工中隧道开挖过程简化为平面应力状态下的力学模型。分析隧道开挖后围岩应力场,划分隧道周边的弹性范围与塑性范围,以此作为隧道交互影响因素;进而分析影响施工稳定性的构成因素。 (2)依靠福平线近接隧道施工项目,运用数值模拟软件对近接隧道施工中出现的:平行近接、上跨近接,开展稳定性模拟研究,分析隧道安全系数在不同工况、不同近接距离上的变化规律,探究隧道断面上安全系数危险点,以及施工过程中既有隧道断面的位移变化趋势,得到既有隧道在近接施工中位移量较大的位置。 (3)建立近接隧道施工风险评价模型,运用模糊综合评价法与AHP的评价算法,将评价模型导入虚拟仪器软件平台LabVIEW,综合ACCESS数据库和LabSQL的架构理论,开发了近接隧道施工安全风险评价软件,实现不同用户身份的登录、打分、评价以及查询和打印功能。 论文通过上述研究取得的成果,经理论推导、数值模拟,以及结合工程实例的安全评价系统验证,能够为隧道近接施工安全提供指导。
[Abstract]:As the national economy leaps and bounds, railway construction ushered in an unprecedented period of development opportunities. As a difficult construction type in tunnel construction, railway adjacent tunnel construction appears more and more frequently in each traffic construction site. At the same time, there are more and more problems caused by various security risks associated with it. In the face of urgent construction progress, heavy security tasks, high social concern and other problems, domestic and foreign experts have carried out close tunnel construction related research. In this paper, based on the characteristics of complex geological conditions, various construction methods and prominent safety hidden dangers, the paper starts from the construction mechanics mechanism and the stress change law of surrounding rock in the near connection tunnel construction with the background of the construction of the near Fuping line tunnel and the characteristics of the construction geological conditions of the tunnel of the Fuping line. Carry out the analysis of the influence of the construction of the adjacent tunnel. Based on LabVIEW virtual instrument software platform, a risk assessment system for near tunnel construction is developed. The characteristics and main work of this paper include the following aspects: (1) by using the theory of tube wall in elastoplastic mechanics, the excavation process of the tunnel is simplified to a mechanical model under plane stress. The stress field of surrounding rock after tunnel excavation is analyzed, and the elastic range and plastic range of tunnel periphery are divided, which is regarded as the interaction factor of tunnel. Then it analyzes the factors that influence the stability of the construction. (2) based on the construction project of the near connection tunnel of the Fuping Line, the numerical simulation software is used to simulate the stability of the adjacent tunnel: parallel close connection, upper span close connection, and so on. This paper analyzes the variation law of tunnel safety factor in different working conditions and close distance, probes into the dangerous point of safety factor on tunnel section, and discusses the trend of displacement change of existing tunnel section during construction. The location of the displacement of the existing tunnel in the near connection construction is obtained. (3) the risk evaluation model of the adjacent tunnel construction is established, and the fuzzy comprehensive evaluation method and AHP evaluation algorithm are used. The evaluation model is imported into LabVIEW, a virtual instrument software platform, and the access database and LabSQL architecture theory are integrated to develop the safety risk assessment software for the construction of proximity tunnel. The functions of login, scoring, evaluation, query and printing of different user identities are realized. Through the above research results, through theoretical derivation, numerical simulation, and safety evaluation system verification combined with engineering examples, this paper can provide guidance for tunnel construction safety.
【学位授予单位】:武汉理工大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U455

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