多因素条件下土石混合料击实特性试验分析

Experimental Analysis of Compaction Characteristics of Soil-rock Mixture Under Multi-factor Conditions

为研究土石混合体的击实特性,在室内设计了不同P_(5)含量、最大粒径以及击实功3种影响因素下土石混合体的击实试验。结果表明:随P_(5)含量增加土石混合体的最大干密度先增加后减小,最优含水率呈减小趋势;当P_(5)含量相同时,土石混合体最大粒径为60 mm的最大干密度比80 mm较大,最大粒径为60 mm的最优含水率比80 mm较小;当击实功增至标准击实功时,土石混合体的最优含水率和最大干密度同时增大;当击实功大于标准击实功后,随着击实功的增大,混合料的最大干密度趋于稳定,而最优含水率依然处于增大趋势。

In order to study the compaction characteristics of soil-rock mixture,the compaction tests of soil-rock mixture under three influencing factors including different P_(5) content,different maximum particle size and different compaction work were designed in the laboratory.The results show that with the increase of P_(5) content,the maximum dry density of soil-rock mixture increases first and then decreases,and the optimal water content decreases gradually.With the same P_(5) content,the maximum dry density of the mixture with the maximum particle size of 60 mm was larger than that with the maximum particle size of 80 mm,and the optimal water content of the mixture with the maximum particle size of 60 mm was smaller than that with the maximum particle size of 80 mm.When the compaction work increases from small to standard compaction work,the optimal water content and maximum dry density of the mixture increase simultaneously.When the compaction work is greater than the standard compaction work,the maximum dry density of the mixture tends to be stable with the increase of compaction work,while the optimal water content still increases.