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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 lot of geotechnical test and theoretical analysis, the compaction, swelling and shrinkage, strength and its influencing factors of lime-treated expansive soil in Xiang Hu section are studied. The feasibility of lime-modified expansive soil as filler for railway subgrade is demonstrated. Incorporating a certain amount of lime into expansive soil can reduce the hydrophilicity and expansibility of expansive soil and improve the water stability of expansive soil. Water sensitivity is weak, its strength increases with age and compaction coefficient increases.