低液限粉土路基填料工程特性研究

Study on Engineering Characteristics of Low Liquid Limit Silt in Subgrade Filling

针对低液限粉土路基填料具有液限低、塑性指数小、强度和水稳定性差的特点，文中结合依托工程对低液限粉土进行了水稳定性试验、含水量对压实度影响试验、压实影响深度及碾压遍数试验。研究表明，击实功是保证低液限粉土路基水稳定性的关键因素；松铺厚度和碾压遍数应严格控制，实际施工以30cm铺厚、碾压5～6遍为宜；由于低液限粉土在施工过程中易失水，以大于最佳含水量1％～2％压实可获得较好效果。

For low-liquid-limit silt subgrade filling has the characteristics of low liquid limit, small plasticity index, poor strength and water stability, this paper carries out water stability test, test on the influence of water content on compaction, test on compaction thickness and rolling times for low liquid limit silt combined with engineering. It is indicated from research that compacting power is the key factor to ensure water stability of low liquid limit silt subgrade. Loose paving thickness and rolling times shall be strictly controlled; 30cm thickness and 5 - 6 rolling times shall be optimum in practical construction. For low liquid limit silt is subject to water loss during construction, compaction with water content 1% - 2% higher than that of optimum can receive better effect.