摘要
为解决车辆驶经城市下穿隧道入口处碾压截水沟盖板产生噪声并达噪声峰值的问题,本文提出一种排水型路面结构体系:即把截水沟结构下沉到高透水性沥青路面以下。下穿隧道下坡段雨水流经高透水性沥青路面至横向截水沟,再排至隧道纵向排水沟,达到排水目的。通过引入成自泸高速入城段(皇经楼路)改造工程,并对工程中排水型路面结构进行数值计算,分析其力学行为。研究结果表明:(1)单次轴载作用下,车辆紧急制动造成的路面沉降值最大,此最大路面沉降值最大为:0.52 mm;在设计使用年限内沥青层弯拉设计累计标准轴次为:2 786.27万次/车道,经疲劳验算后,发现最大变形累计值为9.6 mm,满足规范要求。(2)在不同行车状态(正常启动、一般制动、紧急制动)下,路面铺装层层间最大剪应力值均出现在车辆紧急制动时,最大剪应力值为0.34 MPa,且截水沟箱体正上方处是抗剪切破坏的最不利位置。(3)不同工况条件,不同行车状态下的层间错动值数据分析得到:车辆紧急制动时引起的接触层层间错动值最大,且所有接触层的最大层间错动值均不大于0.25 mm。
To solve the problem of the noise peak generated by rolling the intercepting ditch cover plate at the entrance of urban underpass tunnel,a drainage pavement structure system is proposed,by sinking the intercepting ditch structure below the high permeability asphalt pavement. The rainwater in the downhill section of the tunnel passes through the high permeability asphalt pavement to the transverse intercepting ditch,and then to the longitudinal drainage ditch of the tunnel to achieve the purpose of drainage. Through introducing the reconstruction project of Chengdu Zigong Luzhou Expressway,the drainage road structure in the project is numerically calculated and its mechanical behavior is analyzed. The results show that:(1)Under single axle load,the maximum pavement settlement caused by vehicle emergency braking is 0.52 mm;within the design service life,the cumulative standard axle times of bending and pulling design of asphalt layer is 27.862 7 million times/lane. After fatigue checking calculation,it is found that the cumulative value of maximum deformation is 9.6 mm,which meets the specification requirements.(2)Under different driving conditions(normal start,general braking and emergency braking),the maximum shear stress between pavement layers occurs when the vehicle is in emergency braking,the maximum shear stress is 0.34 MPa,and the most unfavorable position to resist shear damage is directly above the intercepting ditch box.(3)According to the analysis of interlaminar slip value data under different working conditions and driving conditions,the maximum interlaminar slip value caused by vehicle emergency braking is obtained. And the maximum interlayer dislocation value of all contact layers shall not be greater than 0.25 mm..
作者
涂果
肖军
林志宇
尹强
姜克锦
艾嘉
TU Guo;XIAO Jun;LIN Zhiyu;YIN Qiang;JIANG Kejin;AI Jia(Southwest Jiaotong University,Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Chengdu Sichuan 610031,China;Chengdu Expressway Construction and Development Co.,Ltd.,Chengdu Sichuan 610031,China)
出处
《交通节能与环保》
2023年第1期150-156,共7页
Transport Energy Conservation & Environmental Protection
关键词
城市下穿隧道
降噪研究
数值计算
排水型路面结构
层间剪切
层间错动
urban undercrossing tunnel
noise reduction research
numerical calculation
drainage pavement structure
interlaminar shear
interlayer dislocation
