隧道管棚支护对上部铁路路基列车振动传播规律影响研究  

Study on the Influence of Tunnel Pipe Shed Support on Train Vibration Transmission Law of Upper Railway Subgrade

作　　者：董捷 杨博 王小敬 刘建友 DONG Jie;YANG Bo;WANG Xiaojing;LIU Jianyou(School of Civil Engineering,Hebei University of Architecture,Zhangjiakou 075000,China;Hebei Innovation Center of Transportation Infrastructure in Cold Region,Zhangjiakou 075000,China;Beiwang Group Co.,Ltd.,Chengde 067000,China;China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]河北建筑工程学院土木工程学院,河北张家口075000 [2]河北省寒冷地区交通基础设施工程技术创新中心,河北张家口075000 [3]北旺集团有限公司,河北承德067000 [4]中铁工程设计咨询集团有限公司,北京100055

出　　处：《铁道标准设计》2022年第8期125-131,共7页Railway Standard Design

基　　金：国家自然科学基金项目(51878242);河北省自然科学基金项目(E2020404007);青海省科技发展专项(2021-QY-217)。

摘　　要：采用管棚支护是隧道下穿既有路基时常用的一种手段,当列车通过隧道正上方时,其所受影响相比一般情况而言更大。因此,对该情况下不同管棚间距时的列车振动传播规律进行研究,从而得到合理管棚间距。采用室内模型试验的方法对地层振动加速度进行监测,结合数值模拟对地层加速度与动位移进行分析。研究结论如下:(1)改变管棚间距,只会改变地层加速度与位移峰值,并不会改变其自上而下的衰减规律;(2)管棚间距会对加速度与位移峰值产生影响,管棚间距越小,加速度与位移峰值越小,当间距减小到40 cm后,继续减小对加速度与动位移影响很小;(3)分析数值模拟中加速度与动位移传播规律,认为合理管棚间距为40 cm。Pipe shed support is a commonly used where the tunnel underpasses the existing subgrade. When the train passes directly above the tunnel, the impact is more significant than it is in normal case. Therefore, the train vibration propagation law with different pipe shed spacing is studied and reasonable pipe shed spacing is obtained. The vibration acceleration of the formation is monitored by the method of indoor model test, and the acceleration and dynamic displacement of the formation is analyzed in combination with numerical simulation. The research results and main conclusions are as follows:(1) Changing the distance between pipe sheds only changes the peak values of acceleration and displacement, but does not change the attenuation law from top to bottom.(2) The distance between the pipe sheds will affect the peak acceleration and displacement. The smaller the distance between the pipe sheds, the smaller the peaks of acceleration and displacement. In the numerical simulation, when the distance is reduced to 40 cm, continued reduction has little effect on acceleration and dynamic displacement;(3) The analysis of the propagation law of velocity and dynamic displacement in numerical simulation shows that the reasonable pipe shed spacing is 40 cm.

关 键 词：隧道下穿 管棚 列车振动 模型试验 数值模拟 管棚间距 

分 类 号：U451[建筑科学—桥梁与隧道工程]