摘要
为提高隧道软岩洞口段的抗震性能,依托某隧道洞口段工程,采用大型振动台模型试验,对采取结构加强的抗震措施进行研究。试验结果表明:随着隧道衬砌结构强度/刚度的增强,由于硬岩部分受地震影响很小,结构安全系数最小值增长较快,最高增长了90.16%;随着隧道断面软岩范围的增加,隧道受地震影响逐步增强,支护结构所承受的地震惯性力和强制位移也不断增加,虽然提高隧道衬砌结构的强度/刚度,但软岩部分支护结构安全系数最小值增长百分比远低于硬岩部分,最高仅为44.73%;软岩部分支护结构的刚度大于围岩,单纯通过提高结构的强度/刚度,其抗震性能提高有限,建议采用结构加强+铰接设计的方式进行隧道软岩洞口段的抗震设防设计。研究成果对于隧道软岩洞口段抗震技术的发展有着重要的意义。
To enhance the aseismic behaviors of the tunnel portal part in soft rock,a large shaking table model test relying on an actual tunnel portal part had been carried out to study the aseismic performance of structural reinforcement method.The test result shows that with the increase of the strength/rigidity of the lining structure,the minimum safety factor of hard-rock tunnel increases rapidly and the maximum value increases by 90.16%because the structure in hard rock suffers minor seismic effect.With the improvement of soft rock range in the tunnel cross-section,the seismic effect that tunnel suffers gradually increases,which makes the seismic inertia force and the forced displacement of the supporting structure increase continuously.Although the strength/rigidity of the lining structure in soft rock has been improved in the test,the percentage increase of the minimum safety factor of the tunnel structure lining is much lower than that of hard rock,and the maximum value is only 44.73%.The rigidity of the supporting structure in soft rock is greater than that of the surrounding rock,the improvement of tunnel anti-seismic performance is limited only by increasing the strength/rigidity of the lining structure.It is proposed to adopt the structural reinforcement method and articulated design to carry out the seismic design of the tunnel portal part in soft rock.The research results are of great significance to the development of anti-seismic technology of tunnel portal part in soft rock.
作者
崔光耀
麻建飞
王明年
王道远
Cui Guangyao;Ma Jianfei;Wang Mingnian;Wang Daoyuan(North China University of Technology,Beijing 100144,China;Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第S02期315-320,共6页
China Civil Engineering Journal
基金
国家自然科学基金(51408008)
北京市青年拔尖人才培育计划(CIT&TCD201704013)
北京市属高校基本科研业务费(110052971921/061)
关键词
隧道工程
洞口段
结构加强
抗震措施
模型试验
tunnel engineering
tunnel portal part
reinforced structure
anti-seismic measures
model test
作者简介
崔光耀(1983—),男,博士,副教授。主要从事隧道及地下工程研究,E-mail:cyao456@163.com;麻建飞(1997—),男,硕士研究生。主要从事隧道及地下工程研究;王明年(1965—),男,博士,教授。主要从事隧道及地下工程研究;王道远(1982—),男,博士,副教授。主要从事隧道及地下工程研究。
