透水混凝土路面对径流水量削减试验

EXPERIMENTAL STUDY ON THE RUNOFF REDUCTION BY THE PERVIOUS CONCRETE PAVEMENT

透水混凝土路面作为低影响开发技术之一,对雨洪的管理与控制具有重要作用。对透水混凝土路面对径流的控制作用进行试验,结果表明：基于设计路面和北京降雨参数,降雨历时分别为30,60,120 min时,透水混凝土路面对径流总量的削减率分别达到60%、55%和40%以上,对洪峰流量的削减率分别达到65%、63%和40%以上;降雨重现期从1年增到100年,产流延迟时间从13 min降至5 min。试验表明,透水混凝土路面的雨量径流系数在0.18~0.54,远小于普通混凝土路面的雨量径流系数0.91。结果表明,透水混凝土路面对延迟产流时间、削减径流水量、削减洪峰流量以及降低径流系数具有很好的作用,可以为该低影响开发技术在国内的应用设计提供参考。

Pervious concrete pavement as one of the low impact development techniques plays an important role on storm water management and control. In this study,the control role of pervious concrete pavement for runoff was tested. According to the basic information about experimental road and Beijing-based rainfall,studies showed that when the rainfall duration was 30,60,120 minutes,respectively,the reduction rate of the total amount of runoff by the pervious concrete pavement reached60%,55%,40%,respectively,and the peak flow reduction rate reached 65%,63% and 40%,respectively. When the rainfall return period increased from 1 to 100 years,the runoff delay time would decrease from 13 min to 5min. Tests showed that the rainfall runoff coefficient of pervious concrete pavement was between 0. 18 and 0. 54,while that of ordinary concrete pavement was 0. 91. The results indicated that pervious concrete pavement has a good effect on the delay of the runoff,runoff amount reduction,peak flow reduction and decreasing runoff coefficient,which could provide a reference for the applications of the low impact development techniques in China.