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研究目的:分析论证全风化的褐红色砾石土在不同情形下,能否作为路基基床底层及基床底层以下路堤的天然填料。研究结果:通过对各种条件下的参数试验研究可知:天然填料不具有膨胀性和松弛性、对粒径小于0.25 mm的土壤机械试验显示低塑性;论证了试验的天然填料在施工和运营阶段对机械和动力作用有足够的稳定性;粗颗粒和砾岩对渗水有足够的稳定性;在饱和状态和逐渐加载到最大荷载的条件下,一维抗压试验显示无明显二次变形;在满足夯实系数和空气孔隙率na后,长期内将不会有另外明显的沉降。
The purpose of this study is to analyze whether the fully weathered maroon gravel soil can be used as a natural packing for the embankment under the subgrade and the bedrock under different conditions. Research results: Through the experimental study of parameters under various conditions, we can see that: the natural filler does not have the expansibility and relaxation, the mechanical test of the soil particle size less than 0.25 mm shows low plasticity; demonstrated the natural filler in the construction and operation stage It has sufficient stability to mechanical and dynamical effects. The coarse particles and conglomerate have enough stability to water seepage. In the condition of saturated state and gradual loading to the maximum load, one-dimensional compression test shows no obvious secondary deformation. After meeting the compaction factor and the air porosity na, there will be no appreciable subsidence over the long term.