路侧积水对青藏公路路基强度的影响分析

Analysis the Influence of Hydrops Along the Subgrade to Qinghai-tibet Highway Subgrade Strength

为了研究多年冻土地区路侧积水与路基病害之间的关系,基于青藏高原格尔木至拉萨109国道的道路病害调查,研究路侧积水对青藏公路路基强度的影响.从路侧积水与病害位置的对应程度较高,结合SWS-3型连续面波仪的路基强度测试结果,并通过对比无路侧积水时的路基强度测试结果,分析路侧积水使冻土区路基土动弹性模量减小且呈不均匀分布,间接导致路基强度减弱,得出路侧积水是冻土路基不均匀变形、纵向裂缝、波浪变形等病害发生的直接诱因.

In order to study the relationship between hydrops along the subgrade and subgrade disease in permafrost area,subgrade disease was investigated in the 109 national road from Ge’ermu to Lhasa on Tibet Plateau.According to the position relation between hydrops along the subgrade and subgrade disease,and by the field test results of the SWS-3 continuous surface wave instrument,the paper gives the reasons for the subgrade disease,such as longitudinal crack,torsion deformation and un-uniform settlement.Then contrasting without phenomenon of hydrops along the subgrade,dynamic elastic was studied by the law of the moisture transfer,which directly weaken subgrade strength.As the result,it leads to the subgrade diseases,such as un-uniform settlement,longitudinal crack and torsion deformation.