论文部分内容阅读
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。
The elastic modulus of subgrade is closely related to the water content. The long-term wet-dry cycle will inevitably lead to the change of the strength of the red clay subgrade. The indoor load-bearing plate method was used to test the modulus of elasticity of red clay with the number of cycles of wet-dry cycles. The results showed that the modulus of elasticity of remolded red clay decreased with the increase of the number of wet and dry cycles, of which the first one was greatly attenuated, the second one was gentle and the attenuation was slow; the larger the degree of compaction was, the larger the attenuation was; The lower the rate of attenuation the greater the rate. Different wetting and drying cycles have different effects on the elastic modulus of red clay. The same moisture content and same compaction degree, the same number of cycles, the modulus of elasticity at the first wetting is higher than that after the first drying. After the first wet-dry cycle, the first rebound modulus after dry and wet are in the range of 10 ~ 15MPa, the first rebound modulus after drying under wet are basically within the range of 15 ~ 25MPa. The research results can provide a reference for the long-term stability evaluation of red clay subgrade.