下穿既有重载铁路隧道支护措施数值模拟研究  

Numerical Analysis of Supporting Measures for Crossing Tunnels with Existing Heavy Rail

作　　者：赵建恩 赵岩 王海龙 ZHAO Jianen;ZHAO Yan;WANG Hailong(Zhangjiakou Tourism Investment Engineering Construction and Development Co.,Ltd,Zhangjiakou,Hebei 075000;Hebei Provincial Key Laboratory for Civil Engineering Diagnosis,Transformation,and Disaster Resistance,Zhangjiakou,Hebei 075000;School of Economics and Management,Hebei University of Architecture,Zhangjiakou,Hebei 075000)

机构地区：[1]张家口旅投工程建设发展有限公司,河北张家口075000 [2]河北省土木工程诊断、改造与抗灾重点试验室,河北张家口075000 [3]河北建筑工程学院经济管理学院,河北张家口075000

出　　处：《河北建筑工程学院学报》2023年第4期9-14,共6页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51878242)。

摘　　要：以张唐重载铁路隧道与新建京张高铁隧道交叉工程为工程背景,通过Flac3D的数值模拟方法,对交叉隧道段进行动力响应分析。在数值模拟过程中,主要研究增大初期支护厚度、施做超前大管棚支护两种支护方式对交叉隧道结构动力响应的影响。结果表明:增加初期支护厚度主要影响下穿隧道衬砌结构的主应力响应,而对上部隧道及中间岩层的动力响应影响不大;施做超前管棚支护对中间岩层竖向加速度有明显的减弱作用,而对下穿隧道加速度响应影响不大,但可以明显减小下穿隧道衬砌结构的主应力响应值。Based on the numerical simulation method of Flac3D,the dynamic response analysis of the cross tunnel section is carried out with the background of Zhangtang heavy-duty railway tunnel and the new cross-section of Beijing-Zhangkou high-speed railway tunnel.In the process of numerical simulation,the influence of the three supporting methods on the dynamic response of the cross tunnel structure is studied by increasing the thickness of the initial support,the support of the large pipe roof and the reinforcement of the existing tunnel.The results show:the main stress response of the tunnel lining structure under the influence of the initial support thickness is mainly affected;The effect of the advance pipe support on the vertical acceleration of the middle strata is obviously weakened,but the principal stress response of the tunnel lining structure can be obviously reduced;Grouting reinforcement of existing tunnel rock can effectively reduce the acceleration of the middle rock formation,and the crossover tunnel structure of the acceleration and the main stress response have a certain inhibitory effect.

关 键 词：重载铁路 交叉隧道 支护方式 减抗振 

分 类 号：U25[交通运输工程—道路与铁道工程]