French drains, geocomposite
drains and/or open-graded drainage layers (OGDL) and by sloping the subgrade. In
Ontario the subgrade is sloped at 3% for most types of highway sections. In #at land-
scape areas the edge drains are required to be installed with a minimum gradient of
0.1% (1000H:1V). To assess the e!ectiveness of the Ontario practice, a research con-
tract was established (`Performance of Geotextile-Based Hydraulic Pavement Sys-
temsa) between Queen's University and MTO. The representatives of the University
24
G.P. Raymond et al. / Geotextiles and Geomembranes 18 (2000) 23}45
included members of the Royal Military College of Canada. The project involved "eld
investigation of several sites (six report herein), and included exhumation of edge
drains and the surrounding granular materials and their testing in the laboratory.
毛石排水沟 ,土工复合材料
排水沟和（或）开放性梯度排水层（OGDL）及以路基坡度计算.安大略省高速路段路基大部分为倾斜3%的类型.在位于景区的#,边缘排水要求设置至少0.1%（1000H:1v）的倾斜度.为评估安大略做法的效果,在皇后大学与MTO之间已建立了一份研究合同（土工布基液压路面系统的性能）.大学的代表
24
G.P. Raymond et al. / 土工布和防渗膜 18 （2000）23}45
成员包括加拿大皇家军事学院.该项目涉及几个服务网站的调查研究（在此有六份报告）,还包括发掘边缘排水和其周围的颗粒材料以及他们在实验室的测试.
（以上敬请参考.满意请采纳）