隧道开挖数值模拟的围岩边界取值范围研究
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摘要
研究目的:隧道数值模拟的应用已相当广泛,在数值建模过程中,如何从实际问题中提取出合理的边界范围,平衡计算精度和占用内存之间关系,选取较佳的结合点,是数值建模中重要的部分。文章结合某隧道的工程实际,从数值模拟分析的角度,分两倍洞跨、三倍洞跨、五倍洞跨和八倍洞跨四种围岩边界范围进行了数值模拟。通过比较其第一主应力、位移和塑性区等结果,提出一般情况下隧道围岩模型的边界范围取值。研究结论:不同边界范围对隧道其周围的应力场和位移场的分布影响不大;一般情况下,取3倍洞距边界范围对隧道进行数值模拟和结构设计,其分析结果和结构设计方案较为安全。
Research purposes: The numerical simulation of tunnel has been widely used.In the numerical simulation process,how to choose the reasonable boundaries for the project and how to balance the relationship between the calculation precision and the occupation of the internal memory of the computer and how to choose the perfect combined pont are the important parts in the modeling for tunnel.This paper presents the four kinds of the numerical simulations of the two times tunnel span,three times tunnel span,five times tunnel span and eight times tunnel span for choosing the boundary range.The general boundary range of the surrounding rock model is offered based on the comparison of results of the first principal stress,displacement and plastic zone. Research conclusions:It is shown that the effect of different boundary ranges of tunnel on the surrounding stress field and displacement field can be ignored in simulation.It is also suggested that the boundary range of the three times tunnel is used for the numerical simulation and structure design,and it can get good analysis result and safe structure design.
Research purposes: The numerical simulation of tunnel has been widely used.In the numerical simulation process,how to choose the reasonable boundaries for the project and how to balance the relationship between the calculation precision and the occupation of the internal memory of the computer and how to choose the perfect combined pont are the important parts in the modeling for tunnel.This paper presents the four kinds of the numerical simulations of the two times tunnel span,three times tunnel span,five times tunnel span and eight times tunnel span for choosing the boundary range.The general boundary range of the surrounding rock model is offered based on the comparison of results of the first principal stress,displacement and plastic zone. Research conclusions:It is shown that the effect of different boundary ranges of tunnel on the surrounding stress field and displacement field can be ignored in simulation.It is also suggested that the boundary range of the three times tunnel is used for the numerical simulation and structure design,and it can get good analysis result and safe structure design.
引文
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[3]曾超,邱祥波,李术才,等.海底隧道的数值模拟研究[J].岩石力学与工程学报,2003(Z1):64-67.Zeng Chao,Qiu Xiangbo,Li Shucai,etc.The NumericalSimulation of the Channel Tunnel[J].Rock Mechanicsand Engineering Journal,2003(Z1):64-67.
[4]祝彦知,冯紫良,方志.地震动下考虑各向异性土体-盾构隧道数值模拟[J].岩土力学,2005(5):710-716.Zhu Yanzhi,Feng Ziliang,Fang Zhi.ConsiderationSeismic Anisotropy Soil-Numerical Simulation ofShield Tunnel[J].Geotechnical engineering,2005(5):710-716.
[5]Feng Ziliang.On the Determination of the Load Causedby Excavating Opening[J].Chinese Journal ofGeotechnical Engineering,1991(3):36-42.
[6]尚岳全.岩体稳定和区域稳定数值模拟模型边界条件确定方法[J].岩石力学与工程学报,1999(6):201-204.Shang Yuequan.The Determined Method on Rock MassStability and Regional Stability Numerical SimulationModel of the Boundary Conditions[J].Rock Mechanicsand Engineering Journal,1999(6):201-204.
[7]黄林冲,徐志胜,彭立敏.基于等维灰数递补模型的软弱围岩隧道变形预测[J].铁道科学与工程学报,2009(6):13-17.Huang Linchong,Xu Zhisheng,Peng Limin.Forecastby Grey Numbers Such as Alternates Model of Three-dimensional Weak Rock Tunnel Deformation[J].Railway Science and Engineering Journal,2009(6):13-17.
[8]周爱国,等.隧道工程现场施工技术[M].北京:人民交通出版社,2005.Zhou Aiguoetc,etc.The Technical of Tunnel EngineeringConstruction[M].Beijing:China Communications Press,2005.
[8]楼晓明,郑俊杰,章荣军.隧道施工引起的地表变形数值模拟[J].铁道工程学报,2007(9):66-70.Lou Xiaoming,Zheng Junjie,Zhang Rongjun.TheNumerical Simulation of Surface Deformation Caused byTunnel Construction[J].Journal of Railway EngineeringSociety,2007(9):66-70.
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