摘要
针对高速铁路隧道缺陷混凝土衬砌裂缝扩展带来的影响,研究气动荷载作用下衬砌裂缝内气体压力的大小及分布规律。基于质量守恒定律、动量定理和能量守恒定律,推导高速铁路隧道衬砌裂缝内控制体的气动压力方程并求解;应用FLUENT软件对裂缝内气动压力进行数值模拟,验证控制方程计算结果,并分析衬砌表面荷载幅值、裂缝开口量、裂纹深度、裂缝顶端宽度4种因素对裂缝内气动压力的影响。结果表明:沿着裂缝深度方向,气动压力呈增大趋势,且最大值发生在裂缝尖端处;衬砌表面荷载和裂缝开口量的增加会不同程度地促进压力峰值增加,裂缝顶端宽度的增加反而会造成缝内压力峰值降低,裂缝深度对压力峰值则几乎没有影响;裂缝内气动压力峰值与缝外气动压力幅值、裂缝开口量基本成正比关系,而与裂缝深度成反比关系,与裂缝顶端宽度二次方大致成反比关系;衬砌表面气压作为压力入口,其大小不会对裂缝内压力造成非线性影响。
Aiming at the influence of crack propagation in defective concrete lining of high-speed railway tunnel,the magnitude and distribution laws of gas pressure in the lining crack under aerodynamic loads were studied.Based on the law of conservation of mass,the theorem of momentum and the law of conservation of energy,the aerodynamic pressure equation of the control body in the lining crack of high-speed railway tunnel was derived and solved.The aerodynamic pressure in the crack was numerically simulated using the software FLUENT,to verify the calculation results of the control equation and analyze the effects of four factors on the aerodynamic pressure in the cracks,including the load amplitude of the lining surface,the crack opening,the crack depth and the crack tip width.The results show that the aerodynamic pressure shows an amplifying trend along the direction of crack depth,and the maximum value occurs at the crack tip.The increase of the lining surface load and crack opening will facilitate the increase of the peak pressure to various degrees,the increase of the crack tip width will cause the decrease of the peak pressure in the crack,while the crack depth has almost no effect on the peak pressure.The peak aerodynamic pressure in the crack is proportional to the amplitude of the aerodynamic pressure outside the crack and the amount of the crack opening,inversely proportional to the depth of the crack and the square of the width of the crack tip.As the inlet of pressure,the pressure on the lining surface will not cause nonlinear effect on the pressure in the crack.
作者
陈一铂
高阳
赵维刚
马伟斌
王志伟
徐飞
CHEN Yibo;GAO Yang;ZHAO Weigang;MA Weibin;WANG Zhiwei;XU Fei(Structural Health Monitoring and Control Institute,Shijiazhuag Tiedao University,Shijiazhuang Hebei 050043,China;Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2022年第6期89-95,共7页
China Railway Science
基金
国家自然科学基金资助项目(51978425,51808359)
中国铁路总公司科技研究开发计划课题(K2018G013)
河北省自然科学基金资助项目(E2019210356)。
关键词
高速铁路隧道
衬砌结构
裂缝
气动压力
High-speed railway tunnel
Lining structure
Crack
Aerodynamic pressure
