黏性土非黏性土质排水沟允许不冲流速查询表.docx

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1、黏性土质排水沟允许不冲流速土质允许不冲流速(ms)土质允许不冲流速(ms)轻壤土0.60-0.80重壤土0.70-0.95中壤土0.65-0.85黏土0.75-1.00注：表中所列允许不冲流速为水力半径R=1Om时的情况；当RW1om时，表中所列数值乘以Ra。指数a值可按下列情况采用：疏松的壤土、黏土，a=13-14;中等密实和密实的壤土、黏土，a=14-15,非黏性土质排水沟允许不冲流速质粒径(mm)水深(m)0.41223.0淤泥0.005-0.0500.12-0.170.15-0.210.17-0.240.19-0.26细砂0.050-0.2500.17-0.270.21-0.320.2

2、4-0.370.26-0.40中砂0.250-1.0000.27-0.470.32-0.570.37-0.650.40-0.70粗砂1.000-2.5000.47-0.530.57-0.650.65-0.750.70-0.80细砾石2.500-5.0000.53-0.650.65-0.800.75-0.900.80-0.95中砾石5.000-10.0000.65-0.800.80-1.000.90-1.100.95-1.20大砾石10,000-15.0000.80-0.951.00-1.201.10-1.301.20-1.40小卵石15,000-25.0000.95-1.201.20-1.40

3、1.30-1.601.40-1.80中卵石25.000-40.0001.20-1.501.40-1.801.60-2.101.80-2.20大卵石40.000-75.0001.50-2.001.80-2.402.10-2.802.20-3.00小漂石75.000-100.0002.00-2.302.40-2.802.80-3.203.00-3.40中漂石100.000-150.0002.30-2.802.80-3.403.20-3.903.40-4.20大漂石150.000-200.0002.80-3.203.40-3.903.90-4.504.20-4.90注：表中所列允许不冲流速为水力半径R=1Om时的情况；当RW1Om时，表中所列数值乘以Ra。指数a值可采用3-1/5.