農(nóng)村土質(zhì)道路路面形態(tài)對道路侵蝕的影響
[Abstract]:As the manifestation of road microstructure, pavement morphology changes the characteristics of road rainfall erosion, which is of great significance in regulating the process of water and sediment transfer in road system. In this paper, four common pavement forms, such as arched, lateral, straight and concave, are studied. The characteristics of road erosion under slope (5 擄, 10 擄, 15 擄) and road shape difference are studied through indoor rainfall simulation test. The results show that the influence of road shape on sediment yield is higher than that on runoff, and road shape changes sediment yield characteristics by changing the hydraulic characteristics of road runoff. When the slope is 10 擄and 15 擄, the flow pattern of concave road surface is jet, the velocity of flow is the largest, the soil erosion rate is significantly higher than that of other road forms, and the particle size of erosion sediment is larger. When the slope is 5 擄and 10 擄, the water flow pattern of arched and flat pavement is slow flow, and the capacity of abortion and sediment production is the weakest, and the ability of resisting rainfall erosion is the best. The sensitivity of concave and straight road to slope is higher. With the increase of slope, sediment yield and flow energy are greatly increased, and the slope has a weak effect on arch and lateral shape. Road shape difference leads to different erosion characteristics. In the course of road design and construction, scientific combination of road configuration and "road-canal" can effectively prevent and control road erosion and reduce the impact of road construction on ecological environment. This study can provide a reference for the construction and maintenance of rural low-grade roads.
【作者單位】: 華中農(nóng)業(yè)大學(xué)水土保持研究中心;江西省土壤侵蝕和防治重點(diǎn)實(shí)驗(yàn)室;江西省水土保持科學(xué)研究院;
【基金】:國家自然科學(xué)基金項(xiàng)目(41501287) 中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(2662015JC007) 江西省水利廳科技項(xiàng)目(KT201522)
【分類號】:S157.1
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