Influence of Polyacrylamide on Soil Detachment Capacity of Purple Soil in the Three Gorges Reservoir Area
The purple soil in the Three Gorges Reservoir area was used as the research object in this research,and the scouring experiment was conducted to obtain the soil detachment capacity of purple soil under 6 addition amounts of polyacrylamide(PAM)(0,0.4,0.8,1.2,1.6 and 2.0 g/m2)after being maintained for various durations(1,3,7,15,30 and 60 days).The influence of PAM addition amount and maintenance duration on soil detachment capacity were studied,and the reasons for the variation of soil detachment capacity were revealed from the perspective of apparent cohesion and water-stable aggregate stability.The results indicated that the soil detachment capacity decreased with the increasing of maintenance duration under the same addition amount of PAM,while the soil detachment capacity decreased with the increase of addition amount of PAM until reaching its minimum value at 0.8 g/m2,then followed by an increasing trend under the same maintenance duration.The relationship between soil detachment capacity and apparent cohesion,as well as water-stable aggregate properties(mean weight diameter and geometric mean diameter),could be well described by a nonlinear logarithmic function.Among these factors,apparent cohesion emerged as the optimal parameter for describing soil detachment capacity.
the Three Gorges Reservoir Areapurple soilpolyacrylamide(PAM)soil detachment capacitymaintenance duration
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