摘要
随着高速列车运行速度的提升,隧道口微气压波幅值剧增,强烈的爆破噪声同时影响着周边环境和附近居民的正常生活.本文研究由平行导坑与横通道组成的联通式缓冲结构对400 km/h高铁隧道微气压波的缓解作用.首先,进行400 km/h动模型试验,验证数值模拟方法的准确性;其次,基于RNG k-ε湍流模型和滑移网格技术分析联通式缓冲结构位置距隧道入口的距离D与联通式缓冲结构长度L对微气压波的影响.研究结果表明:随着D增加,微气压波的缓解率逐渐增大,在D=25 m时达到最优,微气压波幅值减少34.4%;随着L增加,微气压波幅值缓慢增加;当L=30 m时,隧道口20 m处的微气压波幅值为91 Pa,缓解率为37.1%.联通式缓冲结构与既有350 km/h高铁线路上的断面扩大开孔型缓冲结构组合,可将隧道口20 m处微气压波幅值减小至47.3 Pa,降幅达67.3%.联通式缓冲结构合理利用了修建隧道时遗留的平行导坑,可在保障施工成本几乎不变的前提下,显著缓解微气压波,保护隧道周边环境.
Abstract
With the further increase of the running speed of high-speed trains,the amplitude of the micro-pressure wave(MPW)at the tunnel exit increases dramatically,and the strong blasting noise affects both the surrounding environment and the normal life of nearby residents.The mitigation effect of a connected buffer structure consisting of parallel headings and cross passages on MPWs in 400 km/h high speed railway tunnel was investigated.Firstly,a 400 km/h moving model test was conducted to verify the accuracy of the calculation method.Secondly,the RNG k-ε turbulence model and sliding mesh method were used to analyze the effects of the distance between the location of the connected buffer structure and the tunnel entrance D and the length of the connected buffer structure L on MPWs.The results show that the mitigation rate of the MPW gradually increases with the increase of the D and reaches the optimum at D=25 m,and the MPW amplitude decreases by about 34.4%.As the L increases,the MPW amplitude increases slowly.When L=30 m,the MPW amplitude at 20 m of the tunnel exit is 91 Pa,and the mitigation rate is 37.1%.The combination of the connected structure and the buffer structure with a hole at the top of the expanded section on the existing 350 km/h high-speed rail line can reduce the MPW amplitude at 20 m from the tunnel exit to 47.3 Pa,with a mitigation rate of about 67.3%.The connected buffer structure studied in this paper makes reasonable use of the parallel heading left over from the tunnel construction,which can significantly reduce MPWs and protect the tunnel surroundings in guaranteeing almost constant construction costs.
基金项目
国家重点研发计划(2020YFA0710903-C)
国家自然科学基金(52078199)
中国国家铁路集团有限公司项目(P2021J036)
国家科技期刊平台
NSTL
万方数据