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为了客观可靠地评价实际工程中路基压实土的工程性能,在路基填筑设计时考虑了道路实际服务期内气候变化对路基压实土性能的影响. 鉴于含水率测试方法简单且应用广泛,直接采用含水率代替吸力寻求压实非饱和土模量和含水率之间的联系. 采用非饱和土三轴仪对不同初始压实含水率和经历干湿过程后不同含水率土样进行常含水率三轴试验,分析了含水率和围压等对土体模量的影响规律. 研究结果表明: 土体含水率的增加会引起非饱和压实土体模量的降低,且在试验含水率范围内非饱和压实土体模量随含水率呈指数规律变化; 土体模量随围压的增大而增加,但含水率对模量的影响较围压对模量的影响更为显著. 该研究可为服务期内非饱和压实路基土的性能变化评价提供参考.
In order to objectively and reliably evaluate the engineering performance of roadbed compaction soil in practical engineering, the influence of climate change on the performance of subgrade compaction soil during the actual service period of roadbed is considered in the design of subgrade filling.Because the moisture content testing method is simple and widely used, Directly using the water content instead of suction to seek the compaction of unsaturated soil modulus and the relationship between water content.Using unsaturated soil triaxial instrument for different initial compaction moisture content and after the wet and dry process of different moisture content of soil samples often water Rate triaxial test, the influence law of moisture content and confining pressure on soil modulus was analyzed.The results show that the increase of soil water content will lead to the decrease of modulus of unsaturated soil, Within the range, the modulus of unsaturated soil compacts changes exponentially with the water content. The soil modulus increases with the increase of confining pressure. However, the effect of moisture content on modulus is more significant than that of confining pressure This study can provide reference for the evaluation of the performance of unsaturated compacted subgrade soils during the service period.