摘要
为研究路基湿度场受压实方式影响所产生的变化与分布问题,分别构建4种具备不同压实方式的路基数值试验模型,通过分析二维入渗方式的降雨试验结果,总结不同压实方式影响下路基湿度场扰动区的分布特征,以及扰动区扩距、路基湿度与梯度变化的主要规律,并阐述其根本机理。研究结果表明:降雨入渗路基产生湿度扰动区可划分为前、后2个区域,后区表现为湿度较大、梯度较小,前区表现则与后区相反;湿度扰动区扩距和湿度都随着路基压实度的增加而呈线性减小,前扰动区的湿度梯度随着路基压实度呈线性递增;雨水入渗路基速度矢量的竖向分量远大于水平向分量,受到路基压实区组合方式影响,非饱和扰动区的下层路基湿度随上层路基压实度增加呈线性显著降低。
To study the subgrade humidity field distribution with different compaction models, 4 subgrade numerical models with different compaction conditions were established. Through analyzing tow-dimensional infiltration rainfall test results, the influences of different compaction models on the humidity disturbed zone distributions, the extended distances, the subgrade humidity values and gradients were examined. The mechanisms behind these findings were explained. The results show that humidity disturbed zone appears after rainfall infiltration and it can be divided into front and back zone. The characteristics of back zone include the larger humidity and the smaller gradient，while the front zone just has the opposite conditions. The extended distances and humidity values of the disturbed zone decrease linearly with the increase of subgrade compaction degree. The humidity gradient of the front zone increases linearly with the increase of subgrade compaction degree. Since the vertical component of the rainfall infiltrating velocity vector is considerably larger than the horizontal one, the subgrade humidity of a deep layer decreases significantly with the increase of upper subgrade compaction in unsaturated disturbed zones, which is also affected by the composition of subgrade compaction zones.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第4期1341-1346,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学青年基金资助项目(51108452)
关键词
压实方式
路基
二维入渗
湿度场
演变规律
compaction model
subgrade
tow-dimensional infiltration
humidity field
evolution rule
