【作者】 罗勇；

【导师】 杨其新；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2013， 硕士

【摘要】 新建公路隧道穿越强震区时,需要探讨衬砌结构的动力反应机理和采取合理的防震措施。目前大多数主要是针对隧道洞门部位及断层破碎带等不良地质断面的地震动力分析,而对隧道洞身薄弱部位,如紧急停车带局部扩大断面和横向联络通道交叉断面结构的地震反应分析研究较少,本文以龙溪隧道为依托,结合目前地下结构动力分析理论,运用FLAC3D有限差分数值分析软件对隧道洞身特殊结构的地震动力反应研究,主要包括以下研究内容：1.对公路隧道洞身紧急停车带结构的地震动力反应研究,通过FLAC3D动力时程分析方法,探讨了停车带的结构形式、围岩条件和埋深等因素对隧道衬砌结构的地震反应的影响。2.对公路隧道洞身车行横通道结构的地震动力反应研究,主要探讨了横通道与正洞的交叉形式、围岩条件和埋深等因素对隧道衬砌结构的地震反应的影响。3.对公路隧道抗减震方法和措施进行研究,主要探讨了紧急停车带的减震缝的减震效果。通过在紧急停车带附近不同位置处设置减震缝以及考虑采用不同参数的减震材料研究隧道减震缝的减震效果。以上研究表明：紧急停车带过渡段部位结构形式越平缓,越利于抗震。当横通道与主隧道正交连接时,其隧道交叉断面衬砌结构的抗震性能比斜交时好。紧急停车带在过渡段与扩大段交界处设置减震缝减震效果显著,减震缝材料采用变形模量为1MPa左右效果最好。本研究结论对公路隧道减震设计和修建有一定的理论指导和参考价值。更多还原

【Abstract】 It’s necessary to study dynamic response of tunnel and the corresponding anti-shock absorption measures when construct the tunnel in high intensity earthquake area. Most of the current research is mainly aimed at tunnel portal and the fault rupture or bad geological section. Parts of the weak area of the tunnel, such as emergency stop with local expanded sections and transverse passage cross sectional which have less study on earthquake response analysis, this paper base on Long xi tunnel, combined with the current theory of underground structure dynamic analysis, using the FLAC3D finite software to study on seismic dynamic response of the special structure of the tunnel, the main contents are summarized as follows:1. The seismic dynamic responses of the highway tunnel emergency parking structure, through the FLAC3D,discusses the dynamic response of tunnel lining structure, surrounding emergency parking structural style and rock condition and buried depth of tunnel.2. The seismic dynamic response of the highway tunnel cross gallery structure, it has mainly discussed the dynamic response of tunnel lining structure, surrounding tunnel cross gallery connect forms, rock condition and buried depth of tunnel.3.Studies the shock absorption method and measures of highway tunnel emergency parking structure, mainly discusses the effect of the absorbing joint. By setting the absorbing joint at the different positions of the emergency parking area and using different parameters damping materials to study the damping effect of the absorbing.Research shows that,the more gentle of the tunnel emergency parking structure is,the greater the seismic capacity of lining structure is. When the cross channel and the main tunnel orthogonally connected, the seismic performance of the tunnel lining structure is better than the oblique crossing. The best position of the absorbing joint is at the junction of the transition and the expanding section,and the appropriate elastic modulus of the absorbing joint material is about1MPa.This research can provides the theoretical guidance for the actual highway tunnel project.更多还原