单拱大断面偏压隧道衬砌模型试验分析
|
摘要
模型试验方法分析大断面隧道衬砌结构的受力特性是一种比较实用的方法.以单拱四车道隧道为依托,按弹性阶段相似原则进行偏压条件下单孔大断面隧道衬砌破坏的室内模型试验,研究不同围岩条件下,隧道衬砌的破坏机制.试验通过千斤顶加载的方式,模拟偏压条件下,不同围岩级别条件下的隧道衬砌的破坏行为,得到隧道模型的围岩及衬砌之间的接触压力,锚杆、衬砌的应力和位移分布.此外,综合模型试验和数值模拟的结果,分析了大断面隧道受到上部偏压荷载作用时,在衬砌内方面的发展规律及特点.
Model test is a practical method to analysis the mechanical characteristics of lining structure of the large cross-section tunnel.Based on the Longtou mountain tunnel construction in Guangdong province,according to the similar principle of elastic theory,a model test which simulates the destructive power on single-arch large cross-section of bias tunnel is carried out and the failure mechanism of tunnel lining under different surrounding rocks grade is studied.Failure load on the bias tunnel is simulated by the loading of the jack.The contact pressure between the surrounding rock and the lining,the stress and displacement distribution of the lining and the rockbolt ware monitored in the experiment.In addition,by comparing the data of model test and the data of numerical simulation,the characteristics of lining moment,axial force and the occurrence and development of fractures are obtained when the tunnel lining structure is endured by the upper loading.
Model test is a practical method to analysis the mechanical characteristics of lining structure of the large cross-section tunnel.Based on the Longtou mountain tunnel construction in Guangdong province,according to the similar principle of elastic theory,a model test which simulates the destructive power on single-arch large cross-section of bias tunnel is carried out and the failure mechanism of tunnel lining under different surrounding rocks grade is studied.Failure load on the bias tunnel is simulated by the loading of the jack.The contact pressure between the surrounding rock and the lining,the stress and displacement distribution of the lining and the rockbolt ware monitored in the experiment.In addition,by comparing the data of model test and the data of numerical simulation,the characteristics of lining moment,axial force and the occurrence and development of fractures are obtained when the tunnel lining structure is endured by the upper loading.
引文
[1]曾宜江,杨小礼.单拱四车道公路隧道断面的优化[J].石河子大学学报,2008,26(5):615-619.
[2]杨小礼,罗恒,李老三.应单拱四车道公路隧道地震响应研究[J].中南大学学报:自然科学版,2008,39(6):1314-1318.
[3]杨小礼,李亮,刘宝琛.偏压隧道结构稳定性评价的信息优化分析[J].岩石力学与工程学报,2002,36(4):484-488.
[4]刘新荣,郭子红,谢应坤.不良地质下偏压隧道支护结构开裂与治理分析[J].工程勘察,2010,5(1):2-6.
[5]黄成造,严宗雪.龙头山双洞八车道公路隧道的设计与施工[J].铁道建筑,2007(1):52-55.
[6]中交第一公路堪察设计研究院.龙头山隧道施工设计图[Z].西安:中交第一公路堪察设计研究院,2005.
[7]王兵,谢锦昌.偏压隧道模型试验及可靠度分析[J].工程力学,1998,15(1):85-93.
[8]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005:525-614.
[9]宫成兵,张武祥,杨彦民.大断面单洞四车道公路隧道结构设计与施工方案探讨[J].公路,2004(6):177-182.
[10]刘涛,沈明荣,袁勇.偏压连拱隧道围岩稳定性模型试验与数值分析[J].同济大学学报:自然科学版,2008,36(4):460-465.
[11]JTG D70-2004,公路隧道设计规范[S].北京:人民交通出版社,2004.
[2]杨小礼,罗恒,李老三.应单拱四车道公路隧道地震响应研究[J].中南大学学报:自然科学版,2008,39(6):1314-1318.
[3]杨小礼,李亮,刘宝琛.偏压隧道结构稳定性评价的信息优化分析[J].岩石力学与工程学报,2002,36(4):484-488.
[4]刘新荣,郭子红,谢应坤.不良地质下偏压隧道支护结构开裂与治理分析[J].工程勘察,2010,5(1):2-6.
[5]黄成造,严宗雪.龙头山双洞八车道公路隧道的设计与施工[J].铁道建筑,2007(1):52-55.
[6]中交第一公路堪察设计研究院.龙头山隧道施工设计图[Z].西安:中交第一公路堪察设计研究院,2005.
[7]王兵,谢锦昌.偏压隧道模型试验及可靠度分析[J].工程力学,1998,15(1):85-93.
[8]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005:525-614.
[9]宫成兵,张武祥,杨彦民.大断面单洞四车道公路隧道结构设计与施工方案探讨[J].公路,2004(6):177-182.
[10]刘涛,沈明荣,袁勇.偏压连拱隧道围岩稳定性模型试验与数值分析[J].同济大学学报:自然科学版,2008,36(4):460-465.
[11]JTG D70-2004,公路隧道设计规范[S].北京:人民交通出版社,2004.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心