详情

原文传递 EARTHQUAKE RESPONSE OF DOUBLE METRO TUNNELs BUILT IN THICK-SOFT SOIL

论文题名：	EARTHQUAKE RESPONSE OF DOUBLE METRO TUNNELs BUILT IN THICK-SOFT SOIL
关键词：	地下铁道;抗震性能;隧道结构;地震响应
摘要：	Underground metro structures are becoming more and more prevalent in the modern world because of the decreasing availability of quality above ground space and resources due to fast population upsurge. As far as urban earthquake disaster reduction planning is concerned, a study on the earthquake resistant behavior of Metro and its seismic design method are regarded more and more by researchers. The major factor causing severe damages to metro structures is the large deformations of the surrounding soils, so for a metro underground structure embedded in the thick soft soil, the study of the nonlinear earthquake response of soil-metro structure interaction is important.The main works done are as follows:1. The 2-D finite element model was developed in plane strain to model the soil double metro tunnel system by using ABAQUS finite element software. Based on these models, the earthquake response of the double metro tunnel in three different overburden depths is calculated by inputting two different waves.2. The stress diagram of the tunnel structure is completed. The results show that the maximum stress usually exists at the tunnel structure with 45°inclined to the horizontal and vertical axis of the two directions. The stress distribution is the main basis for the design and segment joint of the Metro structure.3. The relative displacement time motion of the top and bottom of the tunnel lining in three different overburden depths is studied together with the acceleration time motion. It is found that the nature of the surrounding soil and the depth of the tunnel have great influence on the displacement and acceleration response of the tunnel. It also proves that the increase in buried depth improved the safety of the underground structure against earthquake damage. The results also show that the relative displacement and acceleration response increases with the increasing of the input peak acceleration.4. The relative displacement and acceleration earthquake response under two different input ground motions are compared. The results show that the relative displacement and the acceleration of the tunnel are significantly larger when the TAFT wave is input than that of inputting the EL-Centro wave. This indicates that the earthquake response of the Metro structure is closely related to the characteristics of the input ground motion.
作者：	Brookman Eric Mensah
专业：	Civil Engineering
导师：	Zhang Jingli
授予学位：	硕士
授予学位单位：	浙江科技学院
学位年度：	2017
正文语种：	中文