正断层位错作用下城市地铁隧道损伤分析  

Damage Analysis of Urban Metro Tunnel under Normal Fault

作　　者：赵颖[1] 郭恩栋[2] 林晓东[3] 

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [3]哈尔滨学院工学院,黑龙江哈尔滨150080

出　　处：《沈阳建筑大学学报（自然科学版）》2016年第1期60-68,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家十二五科技支撑计划项目(2012BAK15B02-01);中央高校基本科研业务费专项资金资助项目(DL13BB20)

摘　　要：目的研究正断层位错作用下城市地铁隧道的抗震薄弱部位,为地铁隧道工程的抗震设计及地震安全性评价工作提供依据.方法采用拟静力弹塑性有限元方法,以北京地铁7号线工程的区间隧道作为研究对象,分析在正断层位错作用下地铁隧道的损伤破坏机理.结果通过大量的计算分析建立了临界覆盖土层厚度(H_(临界))与断层位错量(D_V、D_H)之间的关系式:H_(临界)=52.605D_V+144.117D_H-30.789,回归拟合了能够估计衬砌结构在正断层位错作用下抗震薄弱部位的关系式:L_(损伤)=0.345H+15.545D_V-5.212D_H+42.023(L损伤为损伤区域长度).结论在正断层位错作用下,衬砌结构出现损伤的区域主要发生在活断层附近一定范围,拱顶部位损伤最为严重.增加基岩上覆土层厚度能够减轻衬砌结构的震害程度,当土层厚度不小于临界覆盖土层厚度时,正断层错动对于埋地隧道不会产生影响.正断层作用下竖向张拉力对隧道结构的损伤范围影响较大,在土层厚度相同的情况下,衬砌结构出现损伤区域的最终长度随着断层倾角的增大逐渐增大.This paper is concerned with the seismic weak parts of urban metro tunnel under normal fault. The regional tunnel of Beijing metro line 7 is chosen as case study to provide basis for seismic design and safety evaluation,and the pseudo-static elasto-plastic finite element method is performed to analyze the damage of tunnel structure by normal fault. The calculation results show edthat the correlation betw een the critical value of soil thickness（ H_criticality） and fault dislocation（ D_V、D_H） was： H_criticality= 52. 605D_V＋ 144. 117D_H- 30. 789,and correlation estimating structural seismic weak parts was： L_damage= 0. 345 H ＋ 15. 545D_V- 5. 212D_H＋ 42. 023（ L_damageis damage range）.The damage range of lining structure was located in active fault under the effect of normal fault,and the the most serious destruction was at the vault. The lining destruction degree was reduced with the increase of the ground thickness,and the effect of normal fault rupture on the shallow tunnel was negligible when the soil thickness was greater than or equal to the critical value. Vertical tension had a significant impact on tunnel structural damage under normal fault,and the ultimate length of lining structural damage increased with the fault dip under the same soil thickness.

关 键 词：地铁隧道 正断层 拟静力 损伤分析 

分 类 号：TU391[建筑科学—结构工程] U452.28[建筑科学—桥梁与隧道工程]