垃圾焚烧炉渣的力学特性和破碎特性试验研究

Experimental Study on Mechanical Property and Breakage Characteristic of Waste Incineration Slag

在不同的最大竖向压力(100~3 200 k Pa)下,对上海某生活垃圾焚烧厂炉渣进行了室内压缩试验和直剪试验,并在试验前后对所有试样进行了颗粒筛分。结果表明:炉渣的压缩破碎变形属于不可逆变化,在初始孔隙比一定的条件下,试样的最终压缩量受初始颗粒级配和颗粒大小的共同影响。此外,当炉渣受到的最大竖向压力小于其屈服应力时,压缩后试样的级配曲线较初始级配曲线变化不大;当炉渣受到的最大竖向压力超过其屈服应力时,颗粒破碎明显加剧,压缩后试样的级配曲线受最大竖向压力的影响较大。最后,对直剪试验后炉渣的破碎进行了分析,表明当压力达到一定大小后,由剪切作用产生的颗粒破碎将不再增长。

A series of compression tests and direct shear tests on slag of municipal solid waste incineration,taken from a garbage disposal incineration plant in Shanghai,was performed to investigate particle breakage characteristics under the ranges of vertical pressures from 100 to 3 200 k Pa. It is shown that the compression deformation of slag is not reversible,and the final amount of compression is influenced by the initial particle distribution and particle size. In addition,when the maximum vertical pressure is less than the yield stress of slag,the gradation curve of the compressed sample changes little compared with the initial gradation curve; when the maximum vertical pressure exceeds the yield stress of slag,the particle breakage is obviously aggravated and the gradation curve of the specimen after compression is greatly influenced by the maximum vertical pressure. Finally,the breakage of the slag under direct shear tests is analyzed,which indicates that the particle breakage produced by shearing will not rise when the pressure reaches a certain level.