摘要
为提高排水沥青路面设计可靠性,提出一种表征排水沥青路面排水能力的新评价指标,与目前常用的评价指标进行对比研究建立关系;同时,基于广西南宁高降雨的实际情况,利用暴雨强度公式进行排水沥青路面空隙率的预估研究,分析在最不利降雨条件下的空隙率取值。研究表明,新评价指标极限排水强度与常用指标渗透系数呈对数相关关系,且渗透系数越大,极限排水强度随之增大。依托项目路面结构设计的排水层厚度h=40mm,路线设计的道路横坡ih=2%,计算所得南宁市暴雨强度下空隙率可控制在17.5%~21.5%之间,空隙率随设计重现期的增大而增大,随降雨历时的增大而减小;当降雨历时t=5min、设计重现期P=20时为最不利的降雨环境,空隙率最大为21.5%。
In order to improve the reliability of porous asphalt pavement design,a new evaluation index was proposed to characterize the drainage capacity of porous asphalt pavement,and to establish a relationship with the permeability coefficient.Based on the rainstorm intensity formula of Nanning,the void ratio was studied and the value of void ratio under the most unfavorable rainfall conditions was analyzed.The experimental results show that the ultimate drainage intensity and the permeability coefficient are logarithmically related,and the ultimate drainage intensity increases with the increase of the permeability coefficient.The thickness of the drainage layer is 40 mm,and the cross slope of the road is 2%.The calculated void ratio of the rainstorm intensity in Nanning can be controlled between 17.5%and 21.5%.The void ratio increases with the increase of the design return period.The rainfall duration decreases and decreases;when the rainfall duration is 5 min and the design return period is 20 years,it is the most unfavorable rainfall environment,and the void ratio requirement is 21.5%.
作者
何兆益
汪敏
张从友
HE Zhao-yi;WANG Min;ZHANG Cong-you(College of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Municipal Research Institute of Design,Chongqing 400020,China)
出处
《武汉理工大学学报》
CAS
北大核心
2019年第8期61-66,共6页
Journal of Wuhan University of Technology
基金
国家自然科学基金(51278513).
关键词
排水沥青路面
极限排水强度
暴雨强度
空隙率
高降雨
porous asphalt pavement
ultimate drainage strength
intensity of rainstorm
void ratio
high rain-fall
