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.
关键词
红层泥岩/水泥改良/路堤填料/无侧限抗压强度/干湿循环/粒径效应
Key words
red mudstone/cement improvement/embankment filling material/unconfined compressive strength/dry-wet cycle/particle size effect
维普
万方数据