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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

47

期数:

2024年02期

页码:

311-320

栏目:

出版日期:

2024-06-01

文章信息/Info

Title:

Research on Seismic Fortification of the Entrance of the Tunnel with Small Interval

作者:

郑卢鑫¹; 胡兆兴¹; 张建俊²; 孙 闯²; 王 洋²

(1.中铁九局集团有限公司大连分公司,辽宁 大连 116000; 2.辽宁工程技术大学,辽宁 阜新 123000)

Author(s):

ZHENG Luxin¹; HU Zhaoxing¹; ZHANG Jianjun²; SUN Chuang²; WANG Yang²

(1.China Railway 9th Bureau Group Co.,Ltd.,Dalian Branch,Dalian 116000,Liaoning,China)(2.Liaoning University of Engineering and Technology,Fuxin 123000,Liaoning,China)

关键词:

小净距隧道;  高陡边坡;  隧道洞口;  震动荷载;  抗震设防长度;  数值模拟

Keywords:

the Luding M_S6.8 earthquake;  earthquake-caused casualties;  geological disaster;  aseismic performance

分类号:

U45

DOI:

10.20015/j.cnki.ISSN1000-0666.2024.0021

摘要:

为明确净距与岩体等级对隧道洞口段抗震设防长度的影响规律,以云南玉溪宝山高陡边坡段小净距隧道为工程依托,利用FLAC3D有限差分软件建立小净距隧道数值模型,根据室内力学试验确定模型参数,以校正后的汶川地震波作为震动荷载输入,针对震动荷载作用下隧道洞口段围岩稳定性进行分析,探明隧道围岩与支护结构在不同工况下的动力响应特征,进一步确定合理的隧道抗震设防长度。研究结果表明:同一净距条件下,围岩等级越高,衬砌结构位移及轴力、应力的响应值越小,反之亦然; 宝山隧道最不利工况条件为Ⅴ级围岩、0.5B净距,在震动荷载作用条件下,隧道峰值位移最大值为62.5 cm,衬砌轴力最大值产生于左、右拱脚处,洞口段峰值达1 320 kN,位移曲线下降率升高临界点最大值为78 m(6.0B),最终确定宝山隧道洞口合理设防长度为78 m。

Abstract:

In order to find out the influence of the clearance distance and the rock mass grade on the seismic fortification length of a tunnel entrance section,based on the project of the small-interval Baoshan Tunnel in the high-and steep-slope section of the Yuxi-Chuxiong super highway,the numerical model of the small-interval tunnel is established by using FLAC3D finite difference software,and the model parameters are determined according to the indoor mechanical test.The corrected Wenchuan wave was inputted as the ground motion loading to analyze the stability of the surrounding rock of the Tunnel entrance section.The dynamic response characteristics of the surrounding rock and supporting structure of the Tunnel under different working conditions are discovered.Further,the Tunnel’s reasonable length of seismic fortification is determined.The results show that for the same clearance distance,the higher the surrounding rock grade is,the smaller the response values of lining displacement,internal force,and stress will be,and vice versa.The most unfavorable working conditions for Baoshan Tunnel are Grade V surrounding rock and 0.5B net distance.By the action of the ground-motion loading,the Tunnel’s peak displacement is 62.5 cm.The maximum lining axial force is generated at both the left and the right feet; the peak value of the entrance section reaches 1320 kN.At the critical point where the displacement and the peak curve decline,the maximun value is 78 m(6.0B).Finally,the reasonable fortification length of the Baoshan Tunnel’s entrance is determined as 78 m.

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备注/Memo

备注/Memo:

收稿日期:2023-09-11.
基金项目:国家重点研发计划项目(2017YFC1503101).
第一作者简介:郑卢鑫(1992-),工程师,主要从事隧道建设相关研究工作.E-mail:3082789045@qq.com.

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更新日期/Last Update: 2024-03-20