Research on the Application of Waste Incineration Bottom Slag as Backfill Material for Bridge Abutments
The main components of municipal solid waste incineration bottom ash are slag,ceramics,and metal mate-rials,which are similar to natural sand and gravel.A centrifuge model test under supergravity conditions was used to ana-lyze the soil pressure and settlement characteristics of bottom ash and sand on bridge abutments.The findings indicate that the earth pressure exerted by the bottom slag on the rear side of the bridge abutment decreases with an increase in relative density.At a relative density of 0.8,it is approximately 1.3 times greater than that at a relative density of 1.0 but still lower than the earth pressure exerted by the sand supporting the bridge abutment.Moreover,the settlement deforma-tions in the bottom slag are significantly smaller than those in the sand,with the difference becoming more pronounced as relative density decreases.Bottom slag has larger particle sizes,lower dry weight,and a higher internal friction angle compared to sand under similar conditions.Consequently,the settlement deformations and earth pressure on the rear side of the bridge abutment are smaller for bottom slag,which is a good backfill material for the back of bridge abutment.
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