干线公路全风化花岗岩路基湿度场变化分析

Analysis of the change of the humidity field of the completely weathered granite subgrade of the trunk highway

为研究广西某干线公路全风化花岗岩软土路基内部湿度场的长期变化规律,利用GeoStudio建立路基湿度场数值模型,模拟路基内部湿度变化。计算结果表明:全风化花岗岩路基土含水率主要由气候与地下水影响,路基建成后,路基含水率会随时间逐渐增大到平衡湿度状态,之后地下水主导路基内部含水率的变化。同一水平面内,含水率由路基中心向路基两侧逐渐增大;同一竖直面内,含水率随深度的增加而增加。

In order to study the long-term variation law of the internal humidity field of the fully weathered granite soft soil subgrade of a highway in Guangxi,GeoStudio was used to establish a numerical model of the subgrade humidity field to simulate the internal humidity change of the subgrade.The calculation results show that the moisture content of the fully weathered granite subgrade is mainly affected by climate and groundwater.After the subgrade is completed,the subgrade moisture content will gradually increase to the equilibrium humidity state with time,and then the groundwater will dominate the change of the internal moisture content of the subgrade.In the same horizontal plane,the water content gradually increases from the center of the roadbed to both sides of the roadbed,in the same vertical plane,the water content increases with the increase of depth.