武汉至安康铁路襄胡段路基石灰改良膨胀土填料试验研究

摘要

通过大量的土工试验和理论分析,研究襄胡段石灰改良膨胀土的击实特性、胀缩特性和强度特性及其影响因素。论证了石灰改良膨胀土作为铁路路基填料的可行性：在膨胀土中掺入一定量的石灰,能降低膨胀土的亲水能力和膨胀性,提高膨胀土的水稳定性;石灰改良膨胀土对水的敏感性较弱,其强度随龄期的增加和压实系数的增大而增强。%Through a large number of geotechnical tests and theoretical analysis,the compaction characteristics,expansion characteristics and strength properties of lime stabilized expansive soil in Xiangfan-Hujiaying Section and their influence factors were analyzed.It is demonstrated the feasibility of lime stabilized expansive soil as the railway subgrade filling.A certain amount of cement can reduce the hydrophilic ability and expandability of expansive soil and improve its water stability.Lime stabilized expansive soil is less sensitive to water.Its strength will be improved with age and compaction factor increased.