Characteristics Analysis On Soil Moisture Content Of Different Ecological Slope Protection Forms In Highway

Advanced highway is a significant infrastructure in our country,and protecting the side slopes formed during the road construction plays crucial role in both slope stability and traffic safety.The regular growth of the greening vegetation,as the main body of slope protection,cannot be separated water,especially the soil water regime,which is not only acted as a most sensitive limiting factor that could affect the survival and stability of plant,but a determining factor in restricting revegetation and the ecological environment reconstruction as well,therefore,exploring the dynamic variation characteristics of soil water on the side slopes possess important guiding significance in conducting slope protection successfully.Four typical kinds of slope protection styles,including Turf solution,Hanging Net solution,Hexagon Hollow Brick solution and Rhombus solution,along the Shen Fu Highway,had been taken into account in order to determine the topsoil moisture content of those styles via the Frequency-Domain Reflectometry(FDR)method,so as to analyze the spatio-temporal characteristics of topsoil moisture content in different slope greening procedures,under this circumstance,the water conservation effect of those solutions in highway slopes can be determined at the same time.What the results showed were as follow:(1)During the observation period of April,the soil moisture content increased gradually from upper to lower in all protection slopes,while considering other two months,except the middle slope positions on the Hexagon Hollow Brick slopes that had higher content than other two positions on 3rd and 4th of July and from 3rd to 5th of September,the moisture content on all protection slopes followed the same distribution rule as it was during April;(2)On the 1st and 2nd of April,the mean soil water content followed the order as Turf solution>Hanging Net solution>Hexagon Hollow Brick solution>Rhombus solution,while on the 3 rd and 4th of the same month,it followed the order as Turf solution>Hexagon Hollow Brick solution>Hanging Net solution>Rhombus solution;On the 1st of July,the value followed the order as Turf solution>Rhombus solution>Hanging Net solution>Hexagon Hollow Brick solution,while from 2nd to 4th of the same month and on the 3 rd and 4th of September,it followed the order as Turf solution>Hexagon Hollow Brick solution>Rhombus solution>Hanging Net solution;On the 1st and 2nd of September,the value followed the order as Turf solution>Hanging Net solution>Rhombus solution>Hexagon Hollow Brick solution;(3)The soil moisture content on each slopes during April,July and September followed the orders as Turf solution>Hexagon Hollow Brick solution>Hanging Net solution>Rhombus solution,Turf solution>Hexagon Hollow Brick solution>Rhombus solution>Hanging Net solution and Turf solution>Rhombus solution>Hexagon Hollow Brick solution>Hanging Net solution respectively;Furthermore,in Turf solution and Rhombus solution slopes,the content in each months followed the order as September>April>July,in Hanging Net solution as April>September>July and in Hexagon Hollow Brick solution as April>July>September respectively;(4)The differences between the loss moisture quantities of each slope protection forms showed significant(p<0.05);Under the same slope position,the variation degree of soil water content in each slope position increased gradually as time varying;Under the same slope,on all the protection forms except the Hexagon Hollow Brick one,which followed the order as upper slope>lower slope>middle slope,this degree tend to be weak from upper to lower,which was upper slope>middle slope>lower slope;(5)The variation degree of soil moisture content on different slope protection forms,during April,June and September,followed the order as Rhombus solution(12.5%)>Hanging Net solution(10.6%)>Turf solution(9.2%)>Hexagon Hollow Brick solution(8.5%),Hanging Net solution(25.8%)>Rhombus solution(22.3%)>Turf solution(18.6%)>Hexagon Hollow Brick solution(17.8%)and Hanging Net solution(23.7%)>Rhombus solution(20.0%)>Turf solution(15.8%)>Hexagon Hollow Brick solution(14.6%)respectively,to sum up,on all the protection slopes,the water consumption was maximum in July,and the water retention capacity followed the order as Hexagon Hollow Brick solution>Turf solution>Rhombus solution>Hanging Net solution,therefore,the water conservation effect of cooperating Hexagon Hollow Brick with Amorpha fruticosa L and Kniphofia uvaria was the best one among four slope protection forms.