摘要
文章开展了不同刚度隧道模型在可液化地基土层中的大型振动台试验,通过对比不同刚度隧道周围可液化地基土的孔隙水压力和加速度时程及其傅里叶频率幅值谱和隧道结构应变等,分析了隧道刚度对其周围可液化地基土的影响。结果表明,隧道结构刚度越大,对其周围土层的约束越大,使其附近土层的加速度越小,且对其附近土层的加速度傅里叶谱曲线形状的影响也越大;土与隧道结构相对刚度不同,土层沿深度变化的加速度放大系数变化规律不同;隧道刚度较小时,其周围土层越容易液化,且隧道刚度对其附近土层孔压的发展规律影响较大,土层埋深越浅,孔压的消散就越快;隧道刚度越小更能屈从于周围土层的运动。
Large-scale shaking table tests were conducted for tunnel models with different stiffnesses in a liquefaction soil layer, and the effect of tunnel stiffness on the surrounding liquefiable foundation soil was analyzed by comparing the pore water pressure of the soil around the tunnel and the acceleration time history and its Fourier frequency amplitude spectrum and strain of the tunnel structure. The results show that the larger the stiffness of a tunnel structure, the larger the constraint to the surrounding soil layer and the smaller the acceleration of the soil layer nearby and the greater the influence on the shape of the acceleration Fourier spectrum curve. The laws of the acceleration amplification coefficient varying with the soil layer depth are different under different relative stiffnesses of the soil-tunnel structure. The surrounding soil layer is more inclined to be liquefied when the stiffness of the tunnel is small, and the influence of tunnel stiffness on the development law of the soil layer＇s pore pressure is large. The shallower the soil layer, the faster the dissipation of the pore pressure, and the smaller the tunnel stiffness, the more likely it is to yield to the movement of the surrounding soil layer.
作者
欧阳志勇
崔杰
李亚东
袁丹丹
OUYANG Zhiyong;CUI Jie;LI Yadong;YUAN Dandan(Jiaying University,Meizhou 514015;Earthquake Engineering Research ＆ Test Center of Guangzhou University,Guangzhou 510405)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第4期97-105,131,共10页
Modern Tunnelling Technology
基金
国家自然科学资金重点项目(51438004)
教育部"创新团队发展计划"项目(IRT13057)
国家重点基础研究发展计划(973计划)(2011CB013606)
青年科学基金项目(51508119)
关键词
不同刚度隧道
相对刚度
液化地基
孔压发展规律
振动台试验
加速度放大系数
Tunnel under different stiffnesses
Relative stiffness
Foundation liquefaction
Development law of pore pressure
Shaking table test
Acceleration amplification coefficient
