摘要
文章基于粘弹性人工边界理论,采用地震动力仿真模拟方法,建立了地震SV波斜入射下能同时考虑土体-结构动力相互作用、行波效应的地铁隧道-地基整体分析模型,系统分析了地震SV波斜入射下软硬土体相间复杂地质条件中地铁隧道的动力响应规律。结果表明:地震波入射角度对隧道结构动力响应影响显著,随着入射角度的增加,整个区间隧道的动力响应逐渐减弱;同一角度入射下,隧道在软、硬土体交接处的动力响应要显著高于其余部位,说明该处为抗震不利地带;随着软、硬土体弹性模量相差越来越小,整个区间隧道上各点的动力响应逐渐趋于接近;衬砌结构厚度的增加在一定程度上减少了软硬土体交接处隧道结构的位移和弯矩,提高了隧道的抗震性能。
Based on the viscous-spring artificial boundary theory, a numerical model of a subway tunnel and soil foundation is established by seismic dynamic analogue simulation that considers the soil/structure dynamic interaction and wave effects. The dynamic response law of subway tunnels in strata that is interbedded with soft and hard soil layers under oblique incidence SV waves is analyzed systematically. The results show that： 1） seismic wave incident angle has a significant effect on the tunnel＇s dynamic response and the dynamic response of the running tunnel decreases with an increase of the incident angle; 2） the dynamic response at the stratum interbedded with soft and hard soil layers is more obvious than that in other places under the same incident angle, which indicates this condition is unfavorable for seismic resistance; 3） the dynamic response of each point of the running tunnel tends to be consistent with decrease of the differences of the elastic modulus of soft and hard soil bodies; and 4） increasing the lining thickness reduces the displacement and bending moment of the tunnel structure at the connection of the soft soil body and the hard soil body, which increases the tunnel＇s seismic behavior.
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第1期78-84,共7页
Modern Tunnelling Technology
基金
国家自然科学基金青年基金项目(41602297)
高等学校博士学科点专项科研基金资助项目"复杂场地条件下地下结构抗震性能研究"(20134101120009)
河南省教育厅科学技术研究重点资助项目"桩承式加筋路基抗震设计理论研究"(14A560014)
关键词
地铁隧道
地震波斜入射
复杂地质
动力响应
SV波
软硬相间土体
Subway tunnel
Oblique incidence seismic wave
Complicated geological conditions
Dynamic response
SV wave
Interbedded with soft had hard soil bodies
