土壤固化剂在铁路施工道路路基处理中的应用

Application of Soil Solidifying Agent in Road Subgrade Treatment of Railway Construction

对道路路基掺入土壤固化剂后固化土混合料的无侧限抗压强度、水稳系数和凝结时间影响系数进行试验研究,并对试验段路基进行回弹弯沉试验和浸水膨胀量检测。试验结果表明:固化土底基层混合料的无侧限抗压强度提高24. 4%,水稳系数提高11. 8%,凝结时间影响系数提高8. 2%;土壤固化剂掺量的提高可进一步增大固化土混合料的无侧限抗压强度,且固化土基层混合料的水稳系数和凝结时间影响系数增长规律与固化土底基层混合料基本一致;道路1 d弯沉值为67. 04×10^(-2)mm,浸水膨胀量为0. 019%,说明土壤固化剂有较好的早强作用,且提高了固化土混合料的抗水浸能力。较高的无侧限抗压强度和良好的水稳定性能保证了临时道路的承载能力。

The unconf ined compressive strength,water stability coeff icient and setting time inf luence coeff icient of solidif ied soil mixture in road subgrade were tested and analyzed after incorporation of soil solidifying agent,the rebound def lection tests and the immersion expansion test for the subgrade in the test section were carried out.The test results show that the unconf ined compressive strength of the solidif ied soil subbase mixture is increased by 24.4%,water stability coeff icient is increased by 11.8%,inf luence coeff icient of setting time is increased by 8.2%.The increase of soil solidifying agent admixture can further increase the unconf ined compressive strength of solidif ied soil mixture,the increasing law of water stability coeff icient and setting time inf luence coeff icient of the base mixture of solidif ied soil is basically the same as that of the subbase mixture of solidif ied soil.The def lection value and the immersion expansion amount of road one day is 67.04×10-2 mm and 0.019%,which means soil solidifying agent has a good early strengthening effect and could improve the anti-water immersion ability of solidif ied soil mixture.The high unconf ined compressive strength and good water stability could ensure the carrying capacity of temporary roads.