降雨入渗对非饱和土路基的影响分析

Analysis of the Influence of Rainfall Infiltration on Unsaturated Soil Subgrade

为研究降雨入渗对非饱和土路基的影响,以某高速公路路基工程断面为算例,采用有限元软件Geodtudio中Seep/W模块建立路基二维渗透模型,针对路基压实不足情况下的非饱和土路基影响进行数值分析.结果表明:非饱和土路基的路面沉降与孔压降均随着降雨强度增大逐渐增大;降雨强度较小时,路基压实不足对路面沉降与孔压影响并不明显;随着降雨持时的增长,不同降雨强度下的孔压均逐渐增大,且降雨强度越大孔压增幅越为明显.

To study the effect of rainfall infiltration on the subgrade of unsaturated soil,taking a highway subgrade engineering section as an example,the 2-D seepage model of roadbed is built by using SEEP/W module in finite element software Geodtudio,and numerical analysis is made for the influence of unsaturated soil subgrade under the condition of subgrade compaction.The conclusions are as follows:1)the surface settlement and pore pressure drop of unsaturated soil subgrade gradually increase with rainfall intensity increasing;and when rainfall intensity is relatively small,the influence of subgrade compaction is not obvious;2)with rainfall duration increasing,pore water pressure under different rainfall intensity increases and the stronger the rainfall,the more obvious the pore pressure increase.