武广客运专线路基改良填料的试验研究

结合武广客运专线工程,通过试验研究了全风化泥质粉砂岩的物理力学性质,石灰改良后的液塑限变化、击实特性、水稳定性、无侧限抗压强度及其主要影响因素。试验结果表明:全风化泥质粉砂岩石灰改良后塑性显著降低,亲水性减弱;随着掺入量的增加,最优含水量增大,最大干密度减小;无侧限抗压强度随着压实系数的增大而增大,随着龄期的增长而增加,随着石灰掺入量的增加先增大后减小,最佳石灰掺入量为6%;全风化泥质粉砂岩石灰改良后的物理力学性能有明显改善,特别是力学强度及水理性得到较大提高,能满足客运专线路基填料的要求。

Experiment study on filling material Improvement for the embankment of Wuhan-Guangzhou railway passenger line

Pelitic siltstone whole-weathered was stabilized using lime for Wuhan-Guangzhou railway passenger line.Initially,the chemical and physical properties of the untreated soil were determined.The untreated soil values were used as control points for comparison purposes.The soil was mixed with lime at 5%,6% and 7% by dry weight of soil.The variation of liquid and plastic limit,compaction characteristics,water-resistance,unconfined compressive strength(UCS)of lime-stabilized soil and major factors influencing the properties were obtained by experiments.The results show that plasticity index of lime-stabilized soil decreases with the increase of lime content.As the lime content increases,the optimum water content increases,however,the maximum dry density decreases.UCS of lime-stabilized soil increases with the increase of compacting factor and curing time.Lime content has an important influence on USC of stabilized soil.The USC increases form lime content of 5% to 6% and decreases after the content of 6%.The engineering properties of pelitic siltstone whole-weathered can be improved by lime-stabilizing,especially its mechanical properties and water-resistance.For the pelitic siltstone whole-weathered,lime is suitable stabilizing agent,and the optimal lime content is 6% in dry mass for the soil stabilization in Zhuzhou areas.