芦苇加筋土的轻型击实效果评价研究

Research on Evaluation of Light Compaction Effect of Reed Reinforced Soil

文中针对渤海新区盐渍土的强度和变形问题开展了一系列试验研究,首先将渤海新区盐渍土与不同长度和加筋率的芦苇均匀拌和,按照一定的击实功对其进行轻型击实试验,随后为测试击实效果将其进行无侧限抗压强度试验。试验结果显示,质量加筋率对试验结果影响显著,最大干密度会随着加筋率增加而逐渐降低,降低幅度在每级0.01~0.02 g/cm^(3)之间,同时质量加筋率对最优含水率也有较大影响,最优含水率会随着芦苇掺量的增加而增加,这个趋势会随着加筋率的增大而缩减,当质量加筋率达到0.3%~0.35%时,最优含水率之间的最大差值仅为0.38%,此时可以忽略芦苇掺量对最优含水率的影响。同样加筋长度也对击实试验有较为显著的影响,芦苇加筋土的最大干密度随着加筋长度在减小,干密度会逐渐降低并呈近线性趋势下降,每一级加筋长度约下降0.01~0.02 g/cm^(3)。加筋长度较小时,最优含水率随加筋长度呈近线性增长趋势,当加筋长度达到50 mm时,最优含水率的变化受加筋率的影响较为稳定,加筋长度过长时,质量加筋率过大可能会导致最优含水率的下降,最明显的位置出现在加筋长度为70 mm、加筋率为0.35%处。根据无侧限抗压强度试验,可确定芦苇加筋土的最佳加筋长度和最佳质量加筋率为50 mm和0.25%。

This article carried out a series of experimental studies on the strength and deformation of saline soil in Bohai New Area.First,the saline soil in the Bohai New Area was evenly mixed with reeds of different lengths and reinforcement rates,and a light compaction test was carried out based on a certain compaction power.Then,in order to test the compaction effect,it was subjected to an unconfined compressive strength test.The test results show that the mass reinforcement rate has a significant impact on the test results.The maximum dry density will gradually decrease as the reinforcement rate increases.The decrease range is between 0.01 g/cm^(3) and 0.02 g/cm^(3) per level.At the same time,the mass reinforcement rate also has a great influence on the optimal moisture content.The optimal moisture content will increase as the reed content increases.This trend will decrease as the reinforcement rate increases.When the mass reinforcement rate reaches 0.3%~0.35%,the maximum difference between the optimal moisture contents is only 0.38%.At this time,the influence of the reed content on the optimal moisture content can be ignored.Similarly,the length of reinforcement also has a significant impact on the compaction test.As the maximum dry density of reed-reinforced soil decreases with the length of reinforcement,the dry density will gradually decrease in a nearly linear trend.The dry density decreases by approximately 0.01~0.02 g/cm^(3) at each level of reinforcement length.When the reinforcement length is small,the optimal moisture content shows a nearly linear growth trend with the reinforcement length.When the reinforcement length reaches 50 mm,the change of the optimal moisture content is relatively stable due to the influence of the reinforcement rate.When the reinforcement length is too long,Excessive mass reinforcement rate may lead to a decrease in the optimal moisture content.The most obvious position appears at the length of 70 mm and the reinforcement rate of 0.35%.According to the unconfined compressive strength test,we can regard the reed reinforcement length as 50 mm and the mass reinforcement rate as 0.25%as the optimal reinforcement length and mass reinforcement rate.