论文部分内容阅读
公路路基土含水率受气候影响显著,季节变换将会导致路基土含水率的变化。结合文献中压实路基土含水率的实测结果,分析了压实路基土平衡含水率随气候条件变化的规律,讨论了降雨量、蒸发量等与路基平衡含水率的相关关系;为考虑季节变化修正气候指数,以月降雨量/月蒸发量为基本计算因子,建立了月降雨量/月蒸发量与路基含水率的关系,得到了基于修正气候指数的路基土平衡含水率预估经验公式,并采用文献中实测数据验证该经验公式的合理性。分析结果表明,不同土类路基压实土在相同气候条件下平衡含水率存在差异,但平衡含水率与最优含水率的差值(即路基土含水率增量)相近;路基土含水率与降雨量/蒸发量的关系曲线离散性较大,而基于修正气候指数的路基含水率预估结果与实测值较为吻合;路基土含水率随修正气候指数的增大迅速增大,当修正气候指数增大到3以后,路基含水率随修正气候指数的增大变化平缓;误差分析和文献中实测数据分析表明,文中经验公式可预测不同气候条件下路基土平衡含水率。
Subgrade soil moisture content of highway affected by the climate significantly, seasonal changes will lead to subgrade soil moisture content changes. Based on the measured results of soil moisture content of compacted subgrade in literatures, the law of equilibrium moisture content of compacted subgrade soil with climatic conditions was analyzed, and the correlation between rainfall and evaporation and subgrade moisture content was discussed. In order to consider the seasonal variation Correcting the climatic index, taking the monthly rainfall / monthly evaporation as the basic calculation factor, the relationship between monthly rainfall / monthly evaporation and subgrade moisture content was established, and the empirical formula of equilibrium moisture content of subgrade soil based on modified climate index was obtained. And the empirical data in the literature verify the rationality of the empirical formula. The results show that the equilibrium water content of compacted soil in different soil subgrade is different under the same climatic conditions, but the difference between the equilibrium water content and the optimal water content (ie, the incremental water content of subgrade soil) The relationship between rainfall and evaporation is more discrete, and the estimated results of the subgrade moisture content based on the revised climate index are in good agreement with the measured values. The moisture content of the subgrade soil rapidly increases with the revised climate index. When the revised climate index After the increase to 3, the subgrade moisture content changes smoothly with the increase of the revised climate index. The error analysis and the measured data in the literature show that the empirical formula in the paper can predict the equilibrium moisture content of subgrade soils under different climatic conditions.