Gravel hardness effect on compaction characteristics of gravelly soil  

作　　者：SHI Yunfang LI Shengang JIANG Chen LIU Jinning 

机构地区：[1]School of Resources and Civil Engineering,Northeastern University,Shenyang 110004,China

出　　处：《Journal of Mountain Science》2024年第4期1432-1443,共12页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.51878127);the Fundamental Research Funds for the Central Universities(N180104013).

摘　　要：The compaction characteristics of gravelly soil are affected by gravel hardness.To investigate the evolution and influencing mechanism of different gravel hardness on the compaction characteristics of gravelly soil,heavy compaction tests and crushing tests were conducted on gravelly soils with gravels originated from hard,soft and extremely soft rocks.According to orthogonal experiments and variance analysis,it was found that hardness has a significant impact on the maximum dry density of gravelly soil,followed by gravel content,and lastly,moisture content.For gravel compositions with an average saturated uniaxial compressive strength less than 60 MPa,the order of compacted maximum dry density is soft gravels>hard gravels>extremely soft gravels.Each type of gravelly soil has a threshold for gravel content,with 60%for hard and soft gravels and 50%for extremely soft gravels.Beyond these thresholds,the compacted dry density decreases significantly.There is a certain interaction between hardness,gravel content,and moisture content.Higher hardness increases the influence of gravel content,whereas lower hardness increases the influence of moisture content.Gravelly soils with the coarse aggregate(CA)between 0.7 and 0.8 typically achieve higher dry densities after compaction.In addition,the prediction equations for the particle breakage rate and CA ratio in the Bailey method were proposed to estimate the compaction performance of gravelly soil preliminarily.The results further revealed the compaction mechanism of different gravelly soils and can provide reference for subgrade filling construction.

关 键 词：Gravelly soil HARDNESS Compaction characteristics Crushing characteristics Particle breakage rate Bailey method 

分 类 号：U416.1[交通运输工程—道路与铁道工程]