地铁装配式外置槽道火灾下温度分布与温度应力数值模拟

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摘要为研究地铁装配式外置槽道在火灾场景下的安全性能,采用ABAQUS有限元软件建立混凝土管片、纵向连接螺栓以及外置槽道的数值模型,模拟计算其在碳氢(HC)升温曲线下的温度与温度应力分布规律。研究发现:外置槽道的存在会显著提高纵向连接螺栓的温度,且手孔处与挂耳紧贴的混凝土面的温度分布规律明显区别于无槽道情形,温度高出约100 ℃;外置槽道对手孔侧边和远离手孔混凝土的温度影响不大,但会加速紧贴面混凝土与纵向连接螺栓裸露端的升温;外置槽道进一步加剧了纵向连接螺栓与周边混凝土温度的不均匀性,从而产生额外的温度应力,但仍在允许范围内。

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	蔡燕燕
	朱要亮
	彭健
	刘荣标
	黄少强
	胡润民
	俞缙

关键词: 地铁装配式外置槽道火灾温度分布温度应力

Abstract: In order to study the safety performance of the subway assembled external channel in the fire scenario, the ABAQUS finite element software was used to establish the numerical model of tunnel segments, longitudinal connection bolts and external channel. The temperature and stress distribution of the new structure under the HC heating curve were obtained. The study showed that the existence of external channel could significantly improve the temperature value of longitudinal connection bolts. Compared with the results without external channel, the temperature distribution on the contact surface of the hand hole which close to the hanging ear was significantly different, the temperature value was about 100 ℃ higher. The external channel had little influence on the temperature of the concrete which at the side of the hand hole and away from the hand hole, but it could accelerate the heating of the longitudinal connection bolts which at the exposed end as the same as the contact surface. Additional thermal stress was generated as the external channel further increased the temperature inhomogeneity between the longitudinal connection bolts and the surrounding concrete, but the final result was still within the safe range.

Key words: subway assembled external channel fire temperature distribution temperature stress

收稿日期: 2019-09-02 出版日期: 2019-09-20 发布日期: 2019-11-13 期的出版日期: 2019-09-20

中图分类号:

U453

基金资助: 国家自然科学基金资助项目(51874144,51679093);福建省高校杰出青年科研人才培育计划资助项目(2015年度)

通讯作者: 俞缙(1978— ),男,江苏南京人,博士,教授,博士生导师,主要研究方向为岩石力学与地下工程.E-mail:bugyu0717@163.com

作者简介: 蔡燕燕(1982— ),女,福建泉州人,博士,副教授,硕士生导师,主要研究方向为岩土力学与隧道工程.E-mail:yycai@hqu.edu.cn. *通信作者:俞缙(1978— ),男,江苏南京人,博士,教授,博士生导师,主要研究方向为岩石力学与地下工程.E-mail:bugyu0717@163.com

引用本文:

蔡燕燕,朱要亮,彭健,刘荣标,黄少强,胡润民,俞缙. 地铁装配式外置槽道火灾下温度分布与温度应力数值模拟[J]. 隧道与地下工程灾害防治, 2019, 1(3): 87-95.
CAI Yanyan, ZHU Yaoliang, PENG Jian, LIU Rongbiao, HUANG Shaoqiang, HU Runmin, YU Jin. Numerical simulation of temperature distribution and thermal stress in assembled external channel of metro under fire. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(3): 87-95.

链接本文:

http://tunnel.sdujournals.com/CN/Y2019/V1/I3/87

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