降雨入渗条件下新型路面排水系统性能研究
发布时间：2019-04-22 08:59
【摘要】：为实现路面结构快速有效排水,基于非饱和渗流理论,提出采用复合土工合成排水材料的新型路面排水系统,该系统由三部分组成,从上而下依次为水力传导层、毛细防渗层和隔离层。开展了新型路面排水系统模型试验和数值模拟分析以研究降雨入渗条件下新型路面排水系统性能;模型试验通过在路面结构的基层和路基分别设置张力计,实时监测基层和路基基质吸力变化;采用控制变量方法,建立考虑非饱和渗流的数值分析模型,分析新型路面排水系统设置位置、厚度、坡度对排水性能的影响。研究结果表明:新型路面排水系统可将入渗水快速有效排除,基层材料在试验过程始终处于非饱和状态,并在降雨停止后第10min基层的基质吸力开始回升;新型路面排水系统能够防止水下渗至路基,降雨过程中路基土的吸力始终保持在初始吸力值;采用新型路面排水系统时,基层体积含水率在降雨过程中不断上升但未达到饱和体积含水率,在降雨停止后基层体积含水率呈现小幅下降,路基体积含水率则保持不变;在面层和基层之间、基层和路基之间均设置新型路面排水系统更有利于控制基层吸力和体积含水率;增加新型路面排水系统厚度和坡度可在一定程度上减小基层材料的含水量,提高基层承载比;研究成果可为新型路面排水系统工程应用提供理论依据。
[Abstract]:In order to realize rapid and effective drainage of pavement structure, based on unsaturated seepage theory, a new type of pavement drainage system based on composite geosynthesized drainage material is proposed. The system is composed of three parts, from top to bottom being hydraulic conductive layer. Capillary impervious layer and isolation layer. The model test and numerical simulation analysis of the new pavement drainage system are carried out to study the performance of the new type pavement drainage system under the condition of rainfall infiltration. In the model test, a tensimeter is set up in the base and roadbed of pavement structure to monitor the change of suction of the base and subgrade in real time. By using the control variable method, a numerical analysis model considering unsaturated seepage flow is established, and the influence of the location, thickness and slope of the new drainage system on the drainage performance is analyzed. The results show that the new drainage system can remove the infiltration water quickly and effectively, and the base material is in unsaturated state all the time in the test process, and the matrix suction of the base course begins to rise 10 minutes after the rain stops. The new drainage system can prevent the subaqueous infiltration to the roadbed, and the suction of the roadbed soil keeps at the initial suction value in the course of rainfall. When the new road drainage system is adopted, the volume water content of the base course increases continuously but does not reach the saturation volume water content in the process of rainfall. After the rainfall stops, the volume water content of the base course decreases slightly, while the volume moisture content of the subgrade remains unchanged. It is more beneficial to control the suction and volume moisture content of the base course by setting up a new road drainage system between the surface layer and the base course and between the base course and the roadbed. Increasing the thickness and slope of the new pavement drainage system can reduce the water content of the base material to a certain extent, and improve the bearing ratio of the base course, and the research results can provide the theoretical basis for the application of the new road drainage system engineering.
【作者单位】： 福州大学土木工程学院;福建农林大学金山学院;
【基金】：福建省交通运输厅交通运输科技发展计划项目(201423)
【分类号】：U417.3
本文编号：2462700
[Abstract]:In order to realize rapid and effective drainage of pavement structure, based on unsaturated seepage theory, a new type of pavement drainage system based on composite geosynthesized drainage material is proposed. The system is composed of three parts, from top to bottom being hydraulic conductive layer. Capillary impervious layer and isolation layer. The model test and numerical simulation analysis of the new pavement drainage system are carried out to study the performance of the new type pavement drainage system under the condition of rainfall infiltration. In the model test, a tensimeter is set up in the base and roadbed of pavement structure to monitor the change of suction of the base and subgrade in real time. By using the control variable method, a numerical analysis model considering unsaturated seepage flow is established, and the influence of the location, thickness and slope of the new drainage system on the drainage performance is analyzed. The results show that the new drainage system can remove the infiltration water quickly and effectively, and the base material is in unsaturated state all the time in the test process, and the matrix suction of the base course begins to rise 10 minutes after the rain stops. The new drainage system can prevent the subaqueous infiltration to the roadbed, and the suction of the roadbed soil keeps at the initial suction value in the course of rainfall. When the new road drainage system is adopted, the volume water content of the base course increases continuously but does not reach the saturation volume water content in the process of rainfall. After the rainfall stops, the volume water content of the base course decreases slightly, while the volume moisture content of the subgrade remains unchanged. It is more beneficial to control the suction and volume moisture content of the base course by setting up a new road drainage system between the surface layer and the base course and between the base course and the roadbed. Increasing the thickness and slope of the new pavement drainage system can reduce the water content of the base material to a certain extent, and improve the bearing ratio of the base course, and the research results can provide the theoretical basis for the application of the new road drainage system engineering.
【作者单位】： 福州大学土木工程学院;福建农林大学金山学院;
【基金】：福建省交通运输厅交通运输科技发展计划项目(201423)
【分类号】：U417.3
【相似文献】
相关期刊论文 前8条
1 梁海;胡积兴;李尧;吕新成;;西安咸阳国际机场专用高速公路路面排水系统综合优化设计[J];公路;2009年06期
2 王玉峥,魏家民;浅谈路面排水系统设计及应用[J];交通科技;2005年02期
3 黎伟斌;;高等级公路沥青路面排水系统的设计与探讨[J];中国水运(学术版);2007年04期
4 ;成绵高速公路路面排水系统设计简介[J];西南公路;1997年02期
5 何莉;上海市高等级公路路面内部排水设计探讨——陈海公路中段路面排水系统设计[J];中国市政工程;2005年03期
6 谢殿臣,王莉,李伟,苏本连;水泥混凝土路面结构排水系统的研究[J];黑龙江交通科技;2000年04期
7 周鑫;;道路工程排水评价浅析[J];科技风;2009年05期
8 ;[J];;年期
相关硕士学位论文 前1条
1 冯启军;立交桥下穿引道排水系统研究[D];山东大学;2009年
，本文编号：2462700
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2462700.html
