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为研究石灰对膨胀土高铁路堤的改良效果,以膨胀土和石灰改良膨胀土为原材料,设计两组路堤模型,对其开展3次干湿循环条件下坡体响应离心模型试验研究,重点分析二者作为高铁路堤填料的工程特性差异。结果表明:随深度增加,路堤受大气影响减弱,改良土路堤的大气影响深度为20 cm,较之未改良土路堤深度小,石灰改良膨胀土可以作为高铁路堤填料;膨胀土和未改良土路堤浅部饱和含水率均在40%左右,其深部含水率都小于40%,但未改良土路堤中含水率变化较改良土路堤更为敏感;干湿循环条件下,5%的石灰掺入量可以有效抑制膨胀土变形,较好地遏制其膨胀潜势、渗透性、导热性、透水性等特性参数。
In order to study the effect of lime on the improvement of expansive soil high-speed railway embankment, two groups of embankment models were designed by using expansive soil and lime-treated expansive soil as raw materials. The centrifuge model test of slope response under three wet and dry cycles was conducted. As a high-speed railway embankment filler engineering characteristics differences. The results show that with the increase of depth, the influence of the embankment on the atmosphere is weakened. The atmospheric influence depth of the embankment is 20 cm, which is smaller than that of the unmodified embankment. The expansive soil with lime can be used as the embankment filler for high-speed railway. The expansive soil and unmodified embankment The saturated water content of shallow part is about 40%, and the deep part of water content is less than 40%, but the change of water content in unmodified embankment is more sensitive than that of improved embankment. Under wet and dry conditions, 5% Can effectively restrain the deformation of expansive soil, and better control its expansion potential, permeability, thermal conductivity, water permeability and other characteristic parameters.