摘要
合理的四心圆公路隧道断面形式有助于改善衬砌结构的受力状态,减少复合式衬砌的开裂病害,提高隧道结构的耐久性。该文通过Ansys软件APDL参数化编程平台,基于“曲率连续”的设计思想,构建了拱脚区局部洞形几何尺寸参数化建模方程,建立了锚杆加固区等效力学参数计算方法及数值模拟模型,揭示了四心圆公路隧道拱脚区域局部洞形参数设计对衬砌结构内力的影响规律,结合实际工程研究显示:隧道拱脚弧与中墙弧的半径和长度对于隧道复合式衬砌结构内力的影响较明显,增大拱脚弧半径对于抑制衬砌结构内塑性区发展的效果最为明显;为了减小衬砌结构的开裂风险,提出采用衬砌拉应力为控制目标进行局部形状优化思想,通过中墙弧圆心角θ_(2)、拱脚弧圆心角θ_(3)及中墙弧半径R_(2)对衬砌结构内力极值的敏感性及影响规律分析为皮家岭隧道洞形优化提供了理论依据。
The rational cross-sectional form of the four-center circular highway tunnel contributes to enhancing the stress state of the lining structure,reducing cracks in the composite lining,and enhancing the durability of the tunnel structure.Utilizing the Ansys APDL programming platform and guided by the design principle of continuous-curvature,a parametric modeling equation for the geometrical dimensions of local tunnel shape in arch foot area was established.The calculation method and numerical simulation models for the equivalent mechanical parameters of the anchor reinforcement area were also developed.The study revealed the impact of the local tunnel shape parameter design in the arch foot area on the internal forces of the lining structure in the four-center circle highway tunnel.It is demonstrated through practical engineering research that radii and lengths of the tunnel's arch foot arc and middle wall arc significantly affect the internal forces of composite lining structure,with increasing the radius of the arch foot arc most prominently restraining plastic zone development in lining structure.It is recommended to prioritize controlling lining tensile stress for local shape optimization to mitigate the risk of lining structure cracking.This approach provides a theoretical basis for the shape optimization of the Pijialing Tunnel,analyzing the sensitivity and influence rules of the extreme values of inner forces on the lining structure concerning the central angle of the middle wall arc(θ_(2)),central angle of arch foot arc(θ_(3)),and the radius of middle wall arc(R_(2)).
作者
朱磊
郭萌
郭金勇
沈才华
张涵怡
ZHU Lei;GUO Meng;GUO Jinyong;SHEN Caihua;ZHANG Hanyi(CCCC Tunnel and Bridge(Nanjing)Technology Co.,Ltd.,Nanjing,Jiangsu 211800,China;College of Civil and Transportation Engineering,Hohai University,Nanjing,Jiangsu 210098 China;Hebei Technology Innovation Center of Phase Change Thermal Management of Internet Data Center,Hebei University of Water Resources and Electric Engineering,Cangzhou,Hebei 061001,China)
出处
《中外公路》
2024年第1期177-184,共8页
Journal of China & Foreign Highway
基金
国家自然科学基金重点资助项目(编号:41830110)
中交养护集团2020年重大科技研发项目(编号:27100020Y251,27100020Y249)。
关键词
四心圆公路隧道
参数化建模
复合式衬砌
第一主应力
塑性区
four-center circular highway tunnel
parametric modeling
composite lining
first principal stress
plastic zone
