摘要
将间接边界元法发展至Rayleigh波入射下河谷-隧道地震动力相互作用模拟,在验证所建方法准确性的基础上,定量分析了不同频率Rayleigh波作用下隧道埋深、河谷宽深比对地表位移幅值和衬砌隧道环向应力的影响。结果表明:随着隧道埋深的增加,隧道上方位移逐渐下降,地表位移的放大效应逐渐减弱;河谷宽深比对河谷内部和河谷右侧位移幅值的影响更为显著;浅埋情况下,邻近河谷隧道环向应力幅值系数可达10.0以上,表现出显著的动应力放大效应;在入射频率η=2.0入射下隧道环向应力幅值、空间分布均受河谷宽深比影响显著,但埋深d=3.0a时隧道环向应力幅值放大效应不明显;沿河隧道抗震设计需主要关注浅埋低频工况下的隧道应力放大效应。
Discussing the development of the indirect boundary element method to the simulation of seismic dynamic interaction between river valleys and tunnels under Rayleigh wave incidence.On the basis of verifying the accuracy of the proposed method,the influences of tunnel buried depth and valley width-depth ratio on the surface displacement amplitude and circumferential stress of the lining tunnel under the action of the Rayleigh wave with different frequencies are quantitatively analyzed.The results show that:With the increase of tunnel depth,the displacement above the tunnel gradually decreases,and the amplification effect of surface displacement gradually weakens.The influence of the ratio of width to depth of the valley on the displacement amplitude in the valley and on the right side of the valley is more significant.Under shallow burial conditions,the circumferential stress amplitude coefficient of the tunnel near the river valley can reach more than 10.0,showing a significant dynamic stress amplification effect.Underη=2.0 incidence,the amplitude-amplitude-amplitude-amplitude-is significantly affected by the valley width-to-depth ratio,but the amplitude-amplitude-effect is not obvious when the buried depth d=3.0 a.The seismic design of the tunnel along the river should focus on the amplitude effect of tunnel stress under shallow buried low frequency.
作者
刘中宪
魏霞
金立国
周涛
王莹
Liu Zhongxian;Wei Xia;Jin Liguo;Zhou Tao;Wang Ying(School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,P.R.China;Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,Tianjin 300384,P.R.China;Institute of Geology,China Earthquake Administration,Beijing 100029,P.R.China;School of Civil Engineering,Tianjin University,Tianjin 300350,P.R.China)
出处
《地下空间与工程学报》
北大核心
2025年第6期1907-1915,共9页
Chinese Journal of Underground Space and Engineering
基金
北京市自然科学基金(8232016)
国家自然科学基金(52278516)。
