[1]申玉生,陈孔福,李小彤,等.强震区仰坡角度对跨断层隧道结构动力响应影响研究[J].地震工程与工程振动,2022,42(06):192-201.[doi:10.13197/j.eeed.2022.0621]
　SHEN Yusheng,CHEN Kongfu,LI Xiaotong,et al.Influence analysis of front slope angle on dynamic response of tunnel structure through fault in strong earthquake area[J].EARTHQUAKE ENGINEERING AND ENGINEERING DYNAMICS,2022,42(06):192-201.[doi:10.13197/j.eeed.2022.0621]
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强震区仰坡角度对跨断层隧道结构动力响应影响研究
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《地震工程与工程振动》[ISSN:/CN:]

卷:
42
期数:
2022年06期
页码:
192-201
栏目:
研究论文
出版日期:
2022-12-31

文章信息/Info

Title:
Influence analysis of front slope angle on dynamic response of tunnel structure through fault in strong earthquake area
作者:
申玉生1;  陈孔福1;  李小彤2;  曾志华3;  王耀达1;  雷龙1
1. 西南交通大学 交通隧道工程教育部重点实验室, 四川 成都 610031;
2. 中交第二公路工程局有限公司工程设计研究院, 陕西 西安 710076;
3. 中国石油天然气管道工程有限公司, 河北 廊坊 065000
Author(s):
SHEN Yusheng1;  CHEN Kongfu1;  LI Xiaotong2;  ZENG Zhihua3;  WANG Yaoda1;  LEI Long1
1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
2. Engineering Design and Research Institute of CCCC Second Highway Engineering Bureau Co., Ltd., Xi’an 710076, China;
3. China Petroleum Pipeline Engineering Co., Ltd., Langfang 065000, China
关键词:
管道隧道; 动力响应; 断层; 仰坡坡角; 主应力放大系数; 设防长度
Keywords:
pipeline tunnel; dynamic response; fault; front slope angle; amplification coefficient of principal stress; fortification length
分类号:
U458
DOI:
10.13197/j.eeed.2022.0621
摘要:
随着西部大量复杂地质环境条件下隧道工程建设，由此在洞口段也经常出现断层破碎带，强震作用下隧道易遭受严重破坏，尤其断层与仰坡的倾向关系尤为重要。文中依托中亚某线管道隧道工程（PGA为0.6g），通过数值模拟对与仰坡倾向相反的断层段隧道衬砌的动力响应开展研究，分析了不同仰坡坡角对跨断层隧道洞口段动力响应的影响。研究表明：地震作用时，随着仰坡坡角由30°增大到75°，隧道共轭45°相对位移峰值与分布范围与之正相关；震后隧道衬砌存在更严重的残余变形；拱腰与拱顶最小主应力值与应力集中范围也随之增大。沿轴向同一位置拱顶的最小主应力放大系数随着仰坡坡角的增加而增大，尤其仰坡坡角由60°增至75°时断层处放大系数增大30%，放大系数突变范围增大60%。经研究发现：隧道穿越与仰坡反倾向的断层破碎带时，仰坡坡角应尽量避免大于60°，抗震设防范围为洞口与断层面之间以及断层面向洞身延伸4倍隧道跨径。同时隧道共轭45°角方向是结构抗震薄弱部位，需要加强抗震设计。文中研究成果对超强震区穿越与仰坡倾向相反断层的隧道洞口段结构抗减震设计具有一定的参考价值。
Abstract:
With the construction of tunnel engineering under a large number of complex geological environment conditions in the west, fault fracture zones often appear in the portal section. The tunnel structure is easy to be seriously damaged under strong earthquakes, especially the relationship of inclination between the fault and front slope is particularly important. Based on a pipeline tunnel project in Central Asia(PGA is 0.6 g), this paper studied the dynamic response of the tunnel structure in the fault section opposite to the inclination the front slope by numerical simulation, and analyzed the influence of different slope angles on the dynamic response of the tunnel portal section across the fault. The research shows that with the increasing of the front slope angle from 30° to 75° under earthquakes, the peak value and distribution range of conjugate 45° relative displacement of tunnel are a positive correlation with the angle;the tunnel lining has more serious residual deformation after the earthquake;the minimum principal stress value and concentration range of arch waist and vault also increase with angle. The amplification coefficient of the minimum principal stress of the vault at the same position along the axial direction increases with the increase of the front slope angle. Especially, when the front slope angle increases from 60° to 75°, the amplification coefficient at the fault increases by 30% and the sudden change range of the coefficient increases by 60%. It is found that when the tunnel passes through the fault fracture zone with reverse inclination to the front slope, the front slope angle should avoid the angle greater than 60° as far as possible, and the seismic fortification range should be from the portal to the fault and extend 4 times the tunnel span to tunnel body. And the conjugate 45° direction of the tunnel is the weak seismic part of the structure and need strengthen the seismic design. The research results have a certain reference value for the anti-seismic design of tunnel portal section passing through the fault with opposite inclination to the front slope in super strong seismic area.

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备注/Memo

备注/Memo:
收稿日期:2021-11-20;改回日期:2022-02-28。
基金项目:国家自然科学基金项目(51778540)
作者简介:申玉生(1976-),男,教授,博士,主要从事强震作用隧道工程抗减震技术研究.E-mail:sys1997@163.com
更新日期/Last Update: 1900-01-01