基于改进动力强度折减法的隧道地震破坏机理探讨

发布时间：2018-01-07 09:28

本文关键词：基于改进动力强度折减法的隧道地震破坏机理探讨　出处：《现代隧道技术》2014年06期 　论文类型：期刊论文

【摘要】：文章分析了影响隧道在地震作用下破坏的因素,研究了不同围岩级别、不同跨度、不同结构形式和不同埋深等条件下隧道结构在地震中的破坏机理,分别针对各个影响因素进行了对比分析;通过静动力转换边界将静力场施加到动力计算中作为初始应力条件,对动力强度折减法进行了改进,通过计算应用证明了其可行性;使用改进的动力强度折减法对深、浅埋隧道在地震作用下的破坏机理进行了计算分析。结果表明,不同埋深隧道在地震中的破坏过程不同,浅埋隧道是从隧道上方两侧开始破坏的,逐渐形成贯通到地面的破裂面;深埋隧道最先在4个边角的应力集中处出现塑性应变,顶部和底部的塑性应变较小,随后从两侧开始逐渐形成贯通的塑性应变区,直至破坏。
[Abstract]:This paper analyzes the influence factors of tunnel under earthquake damage, study the different classes of surrounding rock, different span, the failure mechanism of tunnel structure with different structures and different depth conditions in the earthquake, are analyzed for various factors; through the static power conversion will be applied to the static boundary field in dynamic analysis as the initial stress condition, the dynamic strength reduction method was improved by calculating the application proved the feasibility of using deep; dynamic strength reduction improved, failure mechanism of shallow buried tunnel under earthquake science are analyzed. The results show that the failure process of different depth tunnel in the earthquake, from the top of the tunnel is shallow buried tunnel on both sides began to destroy, gradually formed through the ground to rupture; deep buried tunnel first in the 4 corners of the stress concentration at the plastic strain of the top. The plastic strain at the bottom and the bottom is smaller, and then the plastic strain zone is formed gradually from both sides until it is destroyed.

【作者单位】：华北水利水电大学;重庆交通大学;
【基金】：国家自然科学基金资助项目(51408222;51408223;51409102;41402269) 华北水利水电大学高层次人才科研启动项目资助
【分类号】：U452.28
【正文快照】： 孙常新1,2吕晓春1(1华北水利水电大学,郑州450011;2重庆交通大学,重庆400074)修改稿返回日期:2013-09-161引言隧道结构在地震中的破坏是一个复杂的问题,首先,地震波本身就是一个随机振动过程,具有不确定性;其次,地层围岩是一种不能确切描述的弹塑性聚合物,不同围岩对隧道的影

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