干湿循环下重塑红黏土回弹模量研究

发布时间：2018-05-15 00:09

本文选题：路基 + 重塑红黏土　；参考：《公路》2017年03期

【摘要】：路基的回弹模量与含水率密切相关,长期的干湿循环作用必然会引起红黏土路基强度的变化。采用室内承载板法通过不同干湿循环路径下回弹模量试验,探讨红黏土回弹模量随干湿循环次数的变化规律。结果表明,重塑红黏土回弹模量值随干湿循环次数的增加而衰减,其中第一次衰减很大,其后曲线平缓,衰减较慢;压实度越大衰减幅度越大;含水率越低衰减幅度越大。不同干湿循环路径对红黏土回弹模量影响不同,同一含水率、同一压实度,经历相同的循环次数,先湿后干下回弹模量比先干后湿的要大。经过第一次干湿循环后,先干后湿下回弹模量基本都在10~15MPa范围之内,先湿后干下回弹模量基本都在15~25MPa范围之内。研究成果可为红黏土路基的长期稳定性评价提供参考。
[Abstract]:The modulus of resilience of subgrade is closely related to the moisture content, and the long-term dry and wet circulation will inevitably cause the change of the strength of red clay subgrade. The elastic modulus of red clay under different dry and wet cycle paths was tested by indoor bearing plate method, and the regularity of the modulus of resilience of red clay with the times of dry and wet cycles was discussed. The results show that the modulus of resilience of remolded red clay decreases with the increase of dry-wet cycle times, and the first attenuation is very large, the later curve is flat, and the attenuation is slower; the greater the compaction degree is, the greater the attenuation is, and the lower the moisture content is, the greater the attenuation is. The effects of different dry and wet cycle paths on the elastic modulus of red clay are different. With the same moisture content, the same compaction degree and the same cycle times, the modulus of springback is greater than that of the first wet and then the wet. After the first dry-wet cycle, the modulus of springback is basically within the range of 10~15MPa, and the modulus of springback is within the range of 15~25MPa. The research results can provide a reference for the long-term stability evaluation of red clay subgrade.
【作者单位】：贵州大学土木工程学院;
【基金】：国家自然科学基金,项目编号51368010,51668011 贵州省科技支撑计划项目,黔科合支撑[2016]2005 贵州科技厅-贵州大学联合资金项目,黔科合LH字[2014]7663
【分类号】：U416.1

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