摘要
为研究多年冻土地区沥青路面下部水分的累积情况,在青藏高原北麓河地区的沥青路面和砂砾路面下部进行不同深度和位置的原位水分监测。建立液态水分随时间变化的数据序列,计算2种路面不同位置的水分累积情况。结果表明:沥青路面路基中心、右路肩、右路肩与路基中心中间3个位置均在0.5～2.5m深度范围内和多年冻土顶板附近有明显的水分累积现象;受垂向和水平向渗流与水分迁移的影响,右路肩和路基中心位置水分汇集相对较多;随着沥青路面的使用,路基中心的水分将会不断增加;与砂砾路面相比,沥青路面对地面相对性质的改变减少了土体水分与大气交换的途径,加剧了土体中水分的累积,影响路基稳定性。
In order to study the moisture accumulation process under asphalt pavement in frozen soil regions on Qinghai-Tibet Plateau, moisture was monitored in situ at different depths and locations of asphalt and gravel pavement in Beiluhe region to create a data sequence about the variation amount of liquid water over time and calculate moisture accumulation at different positions of two kinds of pavement. The results show that under asphalt pavement, the roadbed center, the right shoulder, and the middle of the right shoulder and the roadbed center, have obvious moisture accumulation, mainly at the depth of 0.5-2.5 m and permafrost table nearby. Under the impact of the seepage and moisture migration at vertical and horizontal direction, more moisture gathers on the right shoulder and roadbed center. With the use of the asphalt pavement, moisture would increase continuously at roadbed center. Compared with gravel pavement, asphalt pavement changes the ground properties, which would decrease the exchange pathways between soil moisture and the atmosphere so as to exacerbate the accumulation of moisture in the soil, affecting the stability of roadbed.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2013年第2期1-6,41,共7页
China Journal of Highway and Transport
基金
国家自然科学基金创新研究群体基金项目(40821001)
中科院西部行动计划项目(KZCX2-XB2-10)
冻土工程国家重点实验室自主课题(SKLFSE-ZQ-19)
关键词
道路工程
冻土路基
原位监测
水分
积累
评价
road engineering
frozen soil subgrade
in-situ monitoring
moisture
accumulation
evaluation
