摘要
高烈度区隧道不仅面临强地震作用,而且往往面临高构造应力及软弱岩体等复杂地质条件。本文依托丽香铁路隧道,基于高地应力软岩地质条件,采用数值模拟方法,以变形缝间距及加固范围为研究对象,分析不同措施下隧道变形、地震响应特征,并对高地应力软岩条件下隧道减震措施进行研究。结果表明:随变形缝间距增大,衬砌位移逐渐减小、加速度峰值增大,由于变形缝数量上的减少导致结构吸收地震能量能力减弱,变形缝间距为12 m时达到最佳抗震效果;注浆加固条件下,衬砌位移随加固圈范围增大逐渐减小,而加速度峰值呈现先减小后增大趋势,加固圈范围为3 m时抗震效果最佳。
Tunnels in high intensity areas are not only faced with strong earthquake,but also with complex geological conditions such as high geo-stress and weak rock mass.In this paper,based on the geological conditions of soft rock with high geostress in the Lijiang-Shangri-La railway tunnel,the deformation joint spacing and reinforcement range were taken as the research objects and the numerical simulation method was used to analyze the tunnel deformation and seismic response characteristics under different measures,and study the seismic measures for tunnels under high geo-stress soft rock conditions.The results show that with the increase of deformation joint spacing,the lining displacement gradually decreases and the peak acceleration increases.Due to the weakening of the ability of deformation joints to absorb seismic energy,the best seismic effect is achieved at the deformation joint spacing of 12 m.Under the condition of grouting reinforcement,the lining displacement gradually decreases with the increase of the scope of the reinforcement circle,while the peak acceleration first decreases and then increases with the increase of the reinforcement circle.When the reinforcement circle is 3 m,it achieves the best anti-seismic effect.
作者
王凤喜
WANG Fengxi(China Railway 16^(th)Bureau Group Third Engineering Co.Ltd.,Huzhou Zhejiang 313000,China)
出处
《铁道建筑技术》
2023年第4期116-120,共5页
Railway Construction Technology
基金
中国铁建股份有限公司科技研究开发计划项目(2022-B09)。
关键词
高烈度区
软岩隧道
变形缝间距
加固范围
数值计算
减震措施
high intensity area
soft rock tunnel
deformation joint spacing
reinforcement range
numerical calculation
seismic measures
