Hydrological Sensitive Zone Ecological Ditch Structural Design And Analysis Of Treatment Effect

In recent years,with the rapid development of the national economy,the highway network is becoming more and more intensive,and the impact of highway's construction and operation on the surrounding natural environment also attracts more and more attention of scholars at home and abroad."The guidance on the implementation of green highway construction" issued by the Ministry of transport pointed out that,it needs to enhance the function of highway drainage system on disposing and purifying the runoff of road and bridge,to strengthen the collection and disposal of runoff through hydrological sensitive road.The research of ecological ditch by this paper meets the needs of national highway construction and development strategy,which has significant theoretical and project practical meaning.In order to reduce the pollution of the highway runoff on the water of hydrological sensitive zone,this paper designs an ecological ditch with purifying function.The technology has the advantages of ecological environment protection,convenient construction,good landscape and purification effect,which not only can be used to collect the road runoff of hydrological sensitive zone,but also can purify the runoff effectively.This paper studies and analyzes from two aspects of the structure design and purification effect of ecological ditch.This paper proposes three structural schemes,ecological ditch structure of the gravel layer,ecological ditch structure of the vermiculite layer and ecological ditch structure of the composite matrix layer.The research on the disposing effects of three structure is performed by the indoor simulation experiment method,the results show that the three schemes have good effect for purifying runoff,the effect of the structure adding purifying material in disposing road runoff is better than the structure without purifying materials;analyze from the overall purification effect,structure of the vermiculite layer structure is better than matrix composite layer structure,but in purifying oil,the effect of it is lower than the composite matrix layer structure obviously.Take a comprehensive consideration of the purification effect,the economy efficiency of the material and the convenience of the construction,the composite matrix is recommended as the purification layer of the ecological ditch.Take a comprehensive analysis on research results of project team on road runoff purification treatment,facing to different road surface water discharge requirements,this paper proposes road runoff treatment scheme of hydrological sensitive road,(Primary water source protection area,secondary water source protection area)the general road and no water road,which provides a theoretical basis for the road runoff collection and treatment of highway construction,and reference for the similar projects.