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| Erosion experitment of construction spoil with different particle gradation under simulated rainfall condition |
| Cui Bin，Su Fangli, Guo Chengjiu |
| College of Water Resource，Shenyang Agricultural University，110866，Shenyang，China |
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Abstract To reveal the relationship between rainfall and different particle gradation of brown soil, this study selected construction spoil as experimental material from Tianzhu mountain in Shenyang. Construction spoil of different particle gradation were deposited in the same slope of 25°, runoff and sediment production were observed and analyzed under three different rainfall intensities, 1.0, 1.5 and 2.0mm/min using indoor artificial simulation of rainfall. Results shows: 1) With increasing rainfall intensities (from 1.0 to 1.5mm/min), the cumulative sediment yield of five kinds of soil samples increased 12.55, 7.56, 12.00, 8.81 and 10.41g respectively; while under three rainfall intensities （1.0, 1.5 and 2.0mm/min), the difference of the three most and least cumulative sediment yield were 6.39，11.64 and 13.78g. 2) The sediment production decreased as the fineness modulus increased. 3)When the rainfall intensity, slope and rainfall duration were stable, particle size distribution had little effect on runoff, and the cumulative runoff of different particle size distribution had relatively small differences.
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Received: 18 October 2011
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