水位波动下路基湿度动态响应及地下防排水模型试验研究

设计加工了室内路基防排水模型试验系统，进行了地下水位波动影响下的路基水分迁移及地下防排水的室内试验研究。通过改变地下水位高度，研究了无任何隔水措施、加入普通砂垫层及新型防排水材料作为地下防排水基层工况下路基湿度的动态响应，评价了公路路基地下防排水基层的防排水效果。试验结果表明，在地下水位的波动影响下，近地下水位的路基湿度不仅随着地下水位的变化作相应的变化，上部土体湿度因毛细作用的存在也有较大幅度的增加，当地下水位较低时，砂垫层起到了较好的防排水效果；而当地下水位较高时，砂垫层内部的毛细水上升高度大于砂垫层的高度，路基湿度产生较大变化；新型的防排水材料能有效阻止毛细水进入路基内部，具有较好的防排水效果。

Study of moisture dynamic response and underground drainage test of subgrade model under water level fluctuation

A laboratory model experiment system for subgrade drainage is designed and processed(declared a national invention patent);and the study of the subgrade moisture migration and laboratory underground drainage experiment under the influence of groundwater level fluctuation is conducted.By changing the height of the groundwater level,the dynamic response of subgrade humidity is studied in the case of without any waterproof measures,adding ordinary sand cushion,new drain material as underground waterproof and drainage base;and its effect of subgrade is evaluated.The results show that under the influence of the groundwater level fluctuation,the moisture of subgrade near the groundwater changes with the water table accordingly,the upper soil moisture has a relatively substantial increase because of the capillary action;when the water table is low,sand cushion plays a good waterproof and drainage effect;when the water table is high,the rise height of capillary water within the sand cushion is higher than the height of the sand cushion;and the subgrade moisture has a greater changes;new drainage materials can prevent the capillary water entering into the subgrade effectively;and it has good waterproof and drainage effects.