上软下硬地层支护与围岩不密贴数值研究
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摘要
隧道工程中支护与围岩不密贴现象较为普遍。目前对隧道的数值研究大都假定支护与围岩密贴,且不考虑接触面影响。该假定会使得计算结果产生一定的误差。针对这类问题,运用FLAC5.0有限差分软件,以上软下硬地层中浅埋隧道为例,采用接触面单元对支护与围岩不密贴现象进行模拟计算,研究其对隧道稳定性的影响。计算结果表明,采用接触面单元模拟支护与围岩接触,更符合工程实际;当支护与围岩存在间隙时,围岩位移增大较大,支护内力变化不大,能为设计与施工提供更好的指导。
In tunnel engineering, the disconnection of supporting and surrounding rocks is common. At present,most of the numerical studies of tunnels have assumed that supporting and surrounding rocks are closely connected without considering the influence of contact surfaces, which may lead to certain errors in the calculation results. In order to solve such problems, FLAC5.0 finite difference software was used to simulate and calculate the disconnection between supporting and surrounding rocks in shallow-buried tunnel in soft and hard stratum.The influencing factors of tunnel stability were analyzed. The calculation results show that the contact surface element is more suitable for simulating the contact between supporting and surrounding rocks. When there is a gap between supporting and surrounding rocks, the displacement of surrounding rocks increases greatly while the internal force of supporting has no remarkable differences, which can provide better guidance for design and construction.
In tunnel engineering, the disconnection of supporting and surrounding rocks is common. At present,most of the numerical studies of tunnels have assumed that supporting and surrounding rocks are closely connected without considering the influence of contact surfaces, which may lead to certain errors in the calculation results. In order to solve such problems, FLAC5.0 finite difference software was used to simulate and calculate the disconnection between supporting and surrounding rocks in shallow-buried tunnel in soft and hard stratum.The influencing factors of tunnel stability were analyzed. The calculation results show that the contact surface element is more suitable for simulating the contact between supporting and surrounding rocks. When there is a gap between supporting and surrounding rocks, the displacement of surrounding rocks increases greatly while the internal force of supporting has no remarkable differences, which can provide better guidance for design and construction.
引文
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[3]韩刚.上软下硬地层暗挖地铁车站围岩变形规律研究[J].建筑结构,2018,48(S1):778-782.
[4]赵宗智,荆敏,王旭.上软下硬地层Ⅴ级围岩超浅埋隧道开挖技术[J].铁道建筑,2017(7):81-84.
[5]尚艳亮,隆卫,刘宝奎,等.上软下硬大跨隧道变形数值分析与规律研究[J].公路,2017,62(9):262-267.
[6]朱宏海.上软下硬复合地层地铁盾构隧道设计及施工探析[J].隧道建设,2015,35(2):144-148.
[7]徐干成,白洪才,郑颖人,等.地下工程支护结构[M].北京:中国水利水电出版社,2008:8-45.
[8]朱维申,何满潮.复杂条件下围岩稳定性与动态施工力学[M].北京:科学出版社,1996:1-55.
[9]王思敬.地下工程岩体稳定性分析[M].北京:科学出版社,1984:181-188.
[10]孙钧.地下结构有限元法解析[M].上海:同济大学出版社,1988:256-289.