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1 基本情况洪河倒虹吸交叉断面处河底高程为90.5m,回填土高程90.20m,回填土料为原河床开挖土料。因管身斜坡段埋深较小,计算断面取管身水平段(埋深5m)进行计算。洪河倒虹吸管身填土综合指标:湿容重19.3kN/m~3;浮容重10.3kN/m~3,综合摩擦角26°。管顶回填土竖向压力按覆土层厚计算,侧向土压力采用朗肯主动土压力计算。3次勘测的
1 Basic Situation The flood elevation at the cross section of Honghe inverted siphon is 90.5m, the height of backfill soil is 90.20m, and the backfilled material is the original riverbed excavation material. Due to the smaller depth of the body slope section, calculate the horizontal section of the section taken pipe (depth 5m) calculation. Honghe inverted siphon body fill comprehensive indicators: wet weight 19.3kN / m ~ 3; floating capacity 10.3kN / m ~ 3, the comprehensive friction angle of 26 °. The vertical pressure of the backfill pipe top is calculated according to the thickness of soil cover, and the lateral earth pressure is calculated using Rankine active earth pressure. 3 surveys