Analysis on Particle Size Effect of Red Mudstone Cement Improved as Roadbed Filler
To solve the problem that the improvement effect of red mudstone cement weakens with the increase of particle size when it is used as roadbed filler,based on the typical red mudstone weathering along the Chengdu—Dazhou—Wanzhou Railway Project,the experimental study on the improvement of red mudstone cement with different control particle sizes was carried out.The result shows that,the larger the particle size of red mudstone,the worse the improvement effect.Under the condition of 8％cement dosage,the unconfined compressive strength of the improved soil with the maximum particle size of 40 mm is about 50％of that of the improved soil with the maximum particle size of 20 mm.Considering the effect of dry-wet cycle,the recommended cement mixing ratio for the improvement of red mudstone as embankment filler below subgrade bed is 3％when the maximum particle size is 5 mm,4％when the maximum particle size is 20 mm,and 14％when the maximum particle size is 40 mm.
red mudstonecement improvementembankment filling materialunconfined compressive strengthdry-wet cycleparticle size effect
万方数据
维普
