路基土回弹模量影响因素分析

采用室内重复加载三轴试验测试了不同性质路基土的回弹模量(Erm),分析了应力级位、含水量和压实度对路基土回弹模量的影响.结果表明:偏应力(dσ)和侧向应力(3σ)对路基土回弹模量均有显著影响,含水量对路基土回弹模量的影响非常大,而压实度同样是一个主要影响因素.路基土回弹模量测试及取值应遵循的条件为:估算路基土实际受力水平以确定应力级位;根据Miner线性累加损坏准则,对全年各季节不同含水量状况下的路基土回弹模量取加权平均值;压实度可根据实际施工水平取值,或取95%.

Analysis of Influence Factors on Resilient Modulus of Subgrade Soils

Resilient modulus of some subgrade soils were tested using repeated loading triaxial test method.The relationships between resilient modulus and stress level,water content,degree of compaction were analysed.It is shown that both deviator stress and confining stress greatly affect resilient modulus,and the influence of water content is great.Degree of compaction is also an important factor affecting resilient modulus.Base on test result,for testing and valuing standard for resilient modulus of subgrade soils following conditions should be considered: actual stress level;annual weighted-mean resilient modulus is calculated based on Miner's linear damage concept to reflect the seasonal variations in resilient modulus of subgrade soils and the corresponding relative damage;degree of compaction should be taten based on actual level in construction site or 95% can be taken.