连续降雨入渗作用下非饱和土路基稳定性研究

Study on the Stability of Unsaturated Soil Subgrade under Continuous Rainfall Infiltration

为了分析连续降雨入渗对非饱和土路基稳定性的影响,依托G3011线(青海境)察尔汗-格尔木高速公路工程,基于非饱和土路基降雨入渗机理,建立公路路基降雨入渗计算模型,对比分析了非饱和土路基在降雨入渗作用下的孔压、沉降、位移与含水率随时间、空间(水平向、竖向)的分布规律,同时界定了路基降雨入渗影响范围。结果表明:在降雨入渗过程中,地表饱和区域逐渐向路基上部非饱和区域扩展,上部路基基质吸力和土体强度逐渐降低,但土体孔压和含水率逐渐增大。

In order to analyze the influence of continuous rainfall infiltration on the stability of unsaturated soil subgrade, relying on the G3011 line(Qinghai)Qarham-Golmud highway project, the rainfall infiltration calculation model of the highway subgrade is established based on the rainfall infiltration mechanism of unsaturated soil subgrade. The rainfall infiltration calculation model is used to compare and analyze the distribution law of pore pressure, settlement, displacement and water content with time and space(horizontal and vertical) of unsaturated soil subgrade under rainfall infiltration and to clarify the influence range of rainfall infiltration of subgrade. The results show that during the rainfall infiltration, the saturated area of the surface gradually expands to the unsaturated area above the subgrade, and the suction and soil strength of the upper subgrade gradually decrease, but the pore pressure and water content of the soil gradually increase.