400 km/h高速铁路隧道洞口微气压波特征及其缓冲结构设计方法研究-《高速铁路技术》

文章信息/Info

Title:: Study on Characteristics of Micro-pressure Wave at Tunnel Portal of 400 km/h High-speed Railway and Design Method of Buffer Structure

作者:: 胖涛; 杨伟超; 王田天; 罗禄森; 何洪; 1. 中铁二院工程集团有限责任公司, 成都 610031;
2. 中南大学, 长沙 410083

Author(s):: PANG Tao; YANG Weichao; WANG Tiantian; LUO Lusen; HE Hong; 1. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China;
2. Central South University, Changsha 410083, China

Keywords:: 400 km/h high-speed railway|micro-pressure wave|buffer structure|dynamic model

摘要:: 隧道洞口微气压波与列车速度呈3~8次方的正比关系，并产生了显著的环境噪声，但国内外对400 km/h高速铁路隧道洞口微气压波特征及其缓冲结构设计的研究相对不足。针对这一问题，本文采用数值仿真和室内动模型试验相结合的方法，分析了400 km/h高速铁路隧道洞口的微气压波特征及其缓冲结构设计。结果表明：（1）隧道洞口微气压波峰值随列车速度的增大而急速增加，400 km/h速度下隧道洞口的微气压波峰值为350 km/h速度下的170%，远超规范允许值，且受隧道长度的影响规律与350 km/h速度存在一定差异；（2）对于400 km/h的高速铁路隧道，既有单一缓冲结构型式不能满足现有规范要求，采用等截面扩大+斜切+开孔的组合型缓冲结构可达到较好的效果。

Abstract:: The micro-pressure wave at the tunnel portal is proportional to the train speed to the power of 3~8, which produces significant environmental noise. However, the research on the characteristics of the micro-pressure wave at the tunnel portals of 400 km/h high-speed railway and the design method of its buffer structure is relatively insufficient both in China and abroad. To solve this problem, the characteristics of the micro-pressure wave at the portals of a 400 km/h high-speed railway tunnel and the design method of its buffer structure are analyzed by means of numerical simulation and indoor dynamic model test. The results show that:(1) The peak value of micro-pressure wave at the tunnel portals increases rapidly with the increase of train speed, and the peak value of micro-pressure wave at the tunnel portals at 400 km/h is 170% of that at 350 km/h, far exceeding the allowable value of the specifications, and the law is different from that at 350 km/h due to the tunnel length. (2) For the 400 km/h high-speed railway tunnel, the existing single buffer structure can not meet the requirements of the existing specifications, and the combined buffer structure with equal cross-section expansion + oblique cutting + opening can achieve better results.