预压作用下软土固结蠕变及微观结构试验研究

发布时间：2018-06-20 10:21

本文选题：预压荷载 + 软土　；参考：《地下空间与工程学报》2014年03期

【摘要】：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。
[Abstract]:In order to reveal the mechanism of post-construction settlement of soft soil roadbed under preloading, the consolidation creep triaxial test and microstructure test of soft soil reinforced by simulated vacuum, surcharge and combined vacuum and surcharge preloading were carried out. The creep behavior of soil under three kinds of preloading and the mechanism of microstructure change are analyzed. The results show that under three different preloading loads, the settlement of soil is the largest under the condition of combined vacuum and surcharge preloading, followed by the surcharge preloading, and the minimum is vacuum preloading. The settlement of creep process is the largest of surcharge preloading, followed by joint preloading and vacuum preloading. The consolidation and creep of soil under preloading have coupling effect, and the change of microstructure parameters is affected by the preloading mode. The change rate of microstructure parameters is similar to that of macroscopic physical parameters.
【作者单位】：延安大学建筑工程学院;河海大学岩土力学与堤坝工程教育部重点实验室;河海大学水资源利用与工程安全国家工程研究中心;
【基金】：河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目(GH201101) 陕西省教育厅项目(12JK0922) 国家自然基金项目(51309199) 国家科技支撑计划项目(2013BAJ06B00)
【分类号】：U412.22

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