边坡人字形骨架防护骨架尖角设计研究

Study of Design for Herringbone Skeleton Sharp Angle of Side Slope Protection

以广东龙川~怀集高速公路骨架防护工程为依托,探讨雨水在边坡上的运动规律。通过对人字形骨架内坡面薄层水流流速和边坡排水能力进行计算,对比分析不同尖角的人字形骨架的排水能力和工程量,得出如下结论:(1)土质草皮边坡汇水计算时,由于土体的渗透和草皮阻流的影响,入渗率λ的确定较复杂,可将(I-λ)项简化为ψqp,t,以简化计算;(2)在顺坡向间距和横向间距一定的情况下,人字形骨架的排水槽排水能力随尖角减小而增大,90°、75°、60°尖角人字形骨架排水能力变化量为9%~14%;(3)在顺坡向间距和横向间距一定的情况下,人字形骨架的工程量随骨架尖角的减小而增加,90°、75°、60°尖角人字形骨架工程量变化量为10%~25%;(4)在其他条件满足的情况下,人字形骨架尖角宜取较大值,人字形骨架尖角选取建议采用90°,在土质较好的边坡和半岩质边坡,可适当增大尖角。

The paper is based on the Guangdong highway skeleton protection construction from Longchuan to Huaiji, the movement law of rainwater on the slope is explored. By calculating the herringbone skeleton overland flow velocity and slope drainage capacity, and comparative analysis different angles of herringbone frame drainage capacity and engineering quantity, following conclusions have been concluded： 1） in the calculation of soil turfed slope catchment, the infiltration rate λ is complicated to be determined due to the influence of soil permeability and turf flow resistance. The （I-λ） can be simplified asφqp,t to simplify the calculation （φis runoff coefficient） ; 2） under a certain amount of the distance of along the slope direction and the transverse direction, the drainage channel drainage capacity of herringbone skeleton increases with decrease of the . sharp angle. The drainage capacity of herringbone skeleton of 90°, 75°, 60° sharp angle is changed from 9% to 14%; 3） under a certain amount of the distance of along the slope direction and the transverse direction, the engineering quantity of herringbone skeleton increases with decrease of the skeleton sharp angle. The engineering quantity of the herringbone skeleton of 90°, 75°, 60° is changed from 10% to 25%; and 4） if other conditions are met, herringbone frame angle should take a large value which is suggested to use 90°. The sharp angle can be increased properly in good soil and rock slope.