论文部分内容阅读
为了得到同时满足冻胀率和击实效果的最大细粒土含量,通过葡氏击实和冻胀试验,研究了不同细粒土含量、不同干密度条件下细圆砾土填料的冻胀特性。研究结果表明,9%细粒土含量下细圆砾土试样的压实效果最好;细圆砾土试样的冻结过程可以划分为快速冻结区、过渡区、似稳定区和稳定区;细粒土含量低于10%时,细圆砾土属于弱冻胀填料;同时满足冻胀率和压实效果的最大细粒土含量为9%;细粒土含量相同时,细圆砾土试样的冻胀率随干密度的增加,先增大而后减小,即存在一个最不利干密度;冻结48 h后,细圆砾土试样冻土段的含水率均大于初始含水率,其不同位置含水率分布曲线呈S型,且随着细粒土含量的增加逐渐呈现倒三角形分布;细圆砾土试样干密度的增大有效地阻断了水分迁移路径。
In order to get the maximum content of fine soil, which meets both the frost heaving rate and the compaction effect, the frost heaving characteristics of fine round gravel packing with different contents of fine grained soil and different dry densities . The results show that the compaction effect of fine round gravel soil sample is best under 9% fine-grained soil content. The freezing process of fine gravel soil samples can be divided into rapid freezing zone, transition zone, stable-like zone and stable zone. When the content of fine-grained soil is less than 10%, the fine rounded gravel soil belongs to weak frost heave filler; the maximum fine-grained soil content which meets both the frost heave rate and the compaction effect is 9%; when the fine-grained soil content is the same, The frost heaving rate of the sample increased with the increase of dry density first and then decreased, which was one of the most unfavorable dry densities. After 48 h of freezing, the moisture content of the fine soil of the round boulder sample was higher than the initial moisture content, The distribution of water content in different positions showed a S-shaped curve, and presented an inverted triangular distribution with the increase of fine-grained soil content. The increase of dry density of thin round gravel soil samples effectively blocked the water migration path.