改良后的高液限粘土在高速公路施工中的应用

Application of Ameliorated High Liquid Clay in Construction of Expressway

研究目的:通过在高速公路采用石灰对高液限粘土改良后作为路基填料施工的实践,对于石灰改善高液限粘土的工程性能和用EDTA滴定法测定压实后石灰土中石灰剂量的方法进行探讨,总结施工工艺,提出施工要点和建议。研究方法:石灰改良高液限粘土的理论分析、EDTA滴定法测定现场石灰剂量以及掺灰高液限粘土施工工艺制定方法。研究结果:以石灰对高液限粘土改良后作为路基施工填料,采用合理的施工工艺、合格的石灰和正确的测定方法,保证了施工质量和工程进度,降低了投资。研究结论:在采用石灰对高液限粘土改良后作为路基填料的施工中,只有根据具体特定的情况通过实验调整施工工艺,严格控制好石灰质量,适时用EDTA滴定法测定现场压实土样的石灰剂量,才能改善路基填筑用土的性能,提高路基路床的强度和稳定性,保证路基施工质量。

Research purposes： Based on the practical application of ameliorated high liquid limit clay with lime as filling materials of subgrade, the exploration is made on improving the engineering performance of ameliorated high liquid limit clay with lime and adopting EDTA titration method to measure lime dosage in compressed rendzina soil, the construction technique is summarized and the key points of construction is proposed. Research methods：The theoretical analysis is made for ameliorated high liquid limit clay with lime, and EDTA titration method for measuring lime dosage and construction technique for mixing high liquid limit clay with lime are adopted. Research results： For ameliorated high liquid clay with lime as filling materials of subgrade, the construction quality and process can be guaranteed and the construction cost can be reduced, if the rational construction technique, qualified lime and correct measuring method are adopted. Research conclusions： In course of application of ameliorated high liquid limit clay with lime as filling materials of subgrade, the performance of soil for filling subgrade can be improved, the strength and stability of subgrade bed can be enhanced and construction quality of subgrade can be guaranteed only if the construction technique should be adjusted according to different conditions, lime quality is controlled well and EDTA titration method is adopted to measure lime dosage of compressed sample soil on time.