摘要
合理的复式高填明洞间距对衬砌结构和周围土体的力学性质有改善,提高结构安全性。本研究基于有限差分软件FLAC3D,建立复式高填明洞模型,分析回填土体内部的土压力、位移,以及衬砌结构的力学特征。结果表明:明洞间距变大,相邻衬砌结构之间的相互影响越来越小,结构趋向与分离式隧道。在明洞间距增加过程中,衬砌结构上方位置区域内土体的应力和位移呈增大趋势;衬砌结构同高度区域土体的水平向和竖向应力均随着间距增加而变大;衬砌结构的轴力和弯矩和明洞间距呈现正相关趋势,但是增加幅度较小,明洞间距到一定数值后,对衬砌结构轴力和弯矩失去影响。因此,在设计和施工过程中,对于复式高填结构的衬砌间距需控制在合理范围。
The rational spacing of composite high fill open cut tunnel can improve lining structure,surrounding soil mechanical properties,and structural safety.Based on finite difference software FLAC3D,the composite high fill open cut tunnel model was established.The earth pressure and displacement inside backfill soil,as well as the mechanical properties of lining structure were analyzed.The result indicates that with the increase of lining structure,the mutual influence between adjacent lining structures is getting less and less,gradually close to a separated structure.As the open cut tunnel spacing increases,the soil stress and displacement above lining structure show an increasing trend.The horizontal and vertical stresses of soil,with same height of lining structure,increase with the increase of spacing.The axial force and bending moment of lining structure show a positive correlation with open cut tunnel spacing,while the increase is slight.When reaching a certain value of open cut tunnel spacing,it loses influence on the axial force and bending moment of lining structure.Therefore,the lining spacing of high fill structure should be controlled within a reasonable range during design and construction process.
作者
刘学魁
李盛
陈进
贾聂宇驰
LIU Xue-kui;LI Sheng;CHEN Jin;JIA Nie-yu-chi(CCCC Special Engineering Technology Co.,Ltd.,Wuhan,Hubei 430000,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China;Kunming Survey,Design and Research Institute Co.,Ltd.of China Railway Eryuan Engineering Group,Kunming,Yunnan 650200,China)
出处
《公路交通科技》
CSCD
北大核心
2024年第S1期286-292,共7页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51668036,51868041)
甘肃省基础研究创新群体项目(21JR7RA347)
甘肃省教育科技创新项目(2022CXZX-529)
关键词
隧道工程
合理间距
数值模拟
复式高填明洞
土压力
结构响应
tunnel engineering
rational spacing
numerical simulation
composite high fill open cut tunnel
earth pressure
structural respond
