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高速公路黄土路堤病害时有发生,为了解黄土填料力学性质,指导路堤设计参数合理取值,以山平高速公路工程建设为依托,对黄土路堤填料进行了室内压缩、直剪和三轴剪切试验分析。研究结果表明:该地区黄土路堤填料重塑土样属中压缩性土;土样黏聚力对含水率的变化比较敏感,在最佳含水率附近时填土黏聚力在30 kPa左右,内摩擦角受含水率变化的影响相对较小,填土内摩擦角总体在28°左右;100 kPa时含水率对抗剪强度的影响较大,随着压力的增大,含水率对填土的抗剪强度影响不大。
In order to understand the mechanical properties of loess packing and guide the design parameters of embankment reasonable value, relying on the engineering construction of Shanping Expressway, the embankment filler of loess was subjected to indoor compression, direct shear and triaxial shear tests analysis. The results show that the loess embankment remodeling soil in this area is medium compressive soil. The cohesion of soil samples is sensitive to the change of water content. The cohesion of earth fill is about 30 kPa near the optimum moisture content The friction angle is relatively less affected by the change of water content, and the internal friction angle of the soil filling is about 28 °. The water content has a great influence on the shear strength at 100 kPa. With the increase of pressure, Shear strength has little effect.