水平及竖向地震共同作用下双线隧道的响应分析     

王杰  刘华北  邹炎  阮滨 《震灾防御技术》2020,15(4):670-683

基于有效的土-结相互作用有限元数值模拟方法,利用有限元软件ABAQUS对水平及竖向地震共同作用下双线盾构隧道的地震响应进行分析研究。地震动输入选取近场地震Loma、ChiChi、Mammoth和WoLong的基岩水平及竖向加速度时程记录。结果表明,不同近场地震记录对隧道结构的作用不同,隧道的地震反应与场地性质及地震动的频谱特性密切相关。对比隧道在水平及竖向地震动共同作用下的响应与单向水平地震动作用下的响应,发现隧道的最大地震附加内力及其分布均发生较大的变化,在隧道结构抗震设计中需引起重视。另外,分析中还考虑了在双向地震动共同作用下,隧道间距、土-结接触面的摩擦系数、土-结相对刚度、输入的地震记录和竖向地震动相对强度对隧道地震响应的影响等,研究结果对隧道工程的抗震设计具有一定的参考价值。  相似文献   

冀中早第三纪湖盆演化、油气评价与找油方向   总被引：38，自引：6，他引：38       下载免费PDF全文

张文朝  崔周旗  韩春元  郭永军  王洪生  李莉  王海潮  李新坡 《古地理学报》2001,3(1):45-54

根据冀中坳陷大量钻井岩性剖面、地震测线和实验室分析等资料，运用沉积学、层序地层学和石油地质学等多学科理论为指导，深入研究冀中坳陷下第三系区域地质特征、层序地层特征、沉积环境变迁、沉积相带展布和油气分布状况。把冀中坳陷下第三系划分为断陷分割充填期、断陷扩张深陷期、断陷萎缩期、断坳扩展期和断坳抬升消亡期五个演化阶段。最终把区内12个凹陷划分为继承型、早盛型、过渡型、偏移型和沉降型五种类型湖盆，并对它们进行了含油气评价；指出廊固和坝县凹陷具有良好的油气勘探前景，是今后油气勘探的主攻方向；饶阳凹陷东部、晋县和束鹿凹陷，要立足小断块，不断发现小油藏，保证冀中油气长期稳产。  相似文献   

Constitutive description of interface behavior including cyclic loading and particle breakage within the framework of critical state soil mechanics     

Huabei Liu  Hoe I. Ling 《国际地质力学数值与分析法杂志》2008,32(12):1495-1514

The cyclic behavior of soil–structure interface can be very important in dynamic problems. The cyclic behavior of soil–structure interface may be nonlinear, which includes hysteresis, hardening, degradation, and particle breakage. The breakage of granular soil particles during shearing of granular soil–structure interface is associated with cyclic degradation and can be critical to the dynamic behavior of soil–structure system. The critical state soil mechanics concept formerly used to simulate the nonlinear monotonic behavior of granular soil–structure interface was modified and extended to describe the cyclic behavior, especially soil‐particle breakage and degradation during cyclic shearing. Soil‐particle breakage was assumed to relate to the energy consumption during cyclic shearing and the critical state line of the soil–structure interface was assumed to translate with the consumption of shearing energy during cyclic shearing as the threshold value is attained. The model was formulated in the framework of generalized plasticity and is capable of describing the salient features of granular soil–structure interface under cyclic loading. Most of the model parameters have straightforward physical meanings and are calibrated using monotonic or cyclic interface test results. The proposed model was calibrated and validated against published test results. The dependency of interface behavior on stress path and cyclic degradation can be successfully described by the proposed model. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献