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为了揭示预压荷载作用下软土路基工后沉降的机理,开展了室内模拟真空、堆载以及真空—堆载联合预压加固软土的固结蠕变三轴试验及微观结构试验。分析了在三种不同的预压作用下土体固结蠕变性状的不同和微观结构的变化机理。结果表明:在三种不同的预压荷载作用下,固结过程中,是真空—堆载联合预压条件下土体的沉降量最大,其次是堆载预压,最小的是真空预压。蠕变过程的沉降量是堆载预压的最大,其次是联合预压,最小的是真空预压。预压荷载作用下土体的固结和蠕变具有耦合效应;微观结构参数的变化受预压加载方式的影响。微观结构参数的变化率与宏观物性参数的变化率有相似的性质。
In order to reveal the mechanism of post-construction settlement of soft soil roadbed under preload, a three-axis test of consolidation creep and microstructure test of soft soil reinforced by indoor simulated vacuum, heap and vacuum-surcharge combined preloading were carried out. The mechanism of the variation of soil consolidation creep and the change of microstructure under three different preloading conditions are analyzed. The results show that under the condition of three kinds of preloading, the settlement of soil under vacuum-surcharge preloading is the largest, followed by preloading, and the minimum is vacuum preloading. The settlement of the creep process is the maximum of preloading preloading, followed by the joint preloading, the smallest is the vacuum preloading. Soil consolidation and creep under the action of preloading have a coupling effect. The changes of microstructure parameters are affected by the preloading method. The rate of change of microstructural parameters has similarities with the rate of change of macroscopic physical parameters.