水分对于风化千枚岩填筑试槽路基回弹模量的影响

Effects of Water on Modulus of Resilient of Weathered Phyllite Filling Tank Subgrade

地下水和地表水是影响风化千枚岩路基回弹模量的重要因素,在室内修筑1m×1m×1.2m的试槽路基模型,模拟地表水和地下水的影响,分别从试槽顶部和底部补水,分析水分对路基湿化变形和回弹模量的影响.研究结果表明:补充地下水时由于千枚岩填料路基的孔隙率比较大,水分上升高度较小,对路基上层的含水率影响较小,承载板测试的过程中对路基起到不断压实的作用,路基回弹模量出现增大趋势;补充地表水时由于路基孔隙大,同时在水的自重下水分下渗深度也大,风化千枚岩遇水崩解,强度降低,导致回弹模量明显衰减.表明了地表水对路基的影响要比地下水更为明显.

Underground water and surface water are key factors affecting the resilience modulus of the subgrade of weathered phyllite.The experimental tank subgrade model of 1m1m1.2mis built inside the room to simulate the influence of underground water and surface water.Water is supplied from both the top and the bottom of the experimental tank,in order to analyze the effect of water on the subgrade soaking deformation and resilience modulus.The study result shows that during supply of the underground water,it shows little effect on the water content of upper subgrade because of large subgrade porosity and little height of water rising.During the bearing plate test,the upper subgrade is continuously compacted,which results in increase of the resilience modulus of the subgrade.Due to large pores in roadbed and deep water infiltration by the effect of water self-weight in the case of supplement of surface water,weathered phyllite will collapse in the presence of water,resulting in strength decrease and obvious attenuation of rebound modulus,which shows that surface water has a more apparent influence on the roadbed than the groundwater.