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1、在那些情况下路基需要进行个别设计(1409)? 在上列情况下,路基必须进行个别设计,不能直接采用一般标准横断面图。即:1)在任何情况下,超过12公尺的填方和挖方;2)在松软及不稳定的土壤上;3)在地下水位高的地区;4)周期性淹没地区;5)在滑坡及岩堆处;6)翻浆地带;7)在岩石层复杂及不稳定的地段;8)在移动的砂土上;9)在泥沼地区;10)在永久冰冻地区;11)在雪崩地区;12)在强烈地震地区;13)在流石流泥地方。 2、水溝的水力计算方法如何(1414)? 水溝的水力计算分两步来作:第一计算匯集到水溝内的径流量,第二确定水溝的横断面尺寸。计算小匯水面积暴雨径流的公式很多,以包尔达可夫计算法最好。不过在实践中,一般反映其值偏高,公路勘察设计院正在研究修正中。至于HTK公式由于
1. In those cases do subgrade designs need to be individually designed (1409)? In these cases, the subgrade must be designed individually and not directly in the standard cross-sectional view. Namely: 1) in any case, more than 12 meters of fill and cuttings; 2) on soft and unstable soils; 3) in areas with high groundwater tables; 4) in submerged areas; and 5) And rock piles; 6) Thrown zones; 7) Complex and unstable zones in the lithosphere; 8) On moving sand; 9) In the mudflats; 10) In the permafrost zone; 11) In the avalanche zone; 12) in the area of strong earthquake; 13) in the place of flowing stone mud. 2. How to calculate the hydraulic method of ditches (1414)? The hydraulic calculation of ditches is made in two steps: first, calculate the amount of runoff collected in the ditches and secondly determine the cross-sectional dimensions of the ditches. There are many formulas for calculating stormwater runoff in small catchment area, and the calculation method of Baordakov is the best. However, in practice, it generally reflects its high value, and the Highway Survey and Design Institute is studying the amendment. As HTK formula due