作　　者： ; ; ;

机构地区： 长安大学公路学院

出　　处： 《应用基础与工程科学学报》 2012年第4期713-724,共12页

摘　　要： 为提高土工离心模型试验结果的可靠性,在对离心模型试验装置改造的基础上,以不同离心加速度场中的饱和软粘土为研究对象,对其在不同排水条件、不同厚度下的试验结果进行分析,并与解析法和数值法的计算结果进行对比,以分析离心力场对试验结果的影响程度.研究表明,离心机模拟软粘土的固结沉降主要分为土层快速固结和土层缓慢固结,其中快速固结对总沉降量的影响主要受离心加速度大小的影响;离心加速度越大,试验结果偏离理论计算结果越大;加速度在48—71g范围内,软粘土模型厚度过大,试验结果偏离理论计算值亦有一定程度增加;离心模型试验可以对饱和软粘土的双面排水固结进行定性分析. In order to get more reliable results of geotechnical centrifugal model test, based on the modified devices of centrifugal model test, take the saturated soft clay in different centrifugal acceleration field as subject, the results of different soil thickness and different drainage conditions were analyzed. Based on large strain consolidation theory, saturated soft clay consolidation settlement was also calculated by analytical method and numerical method. The three types of analysis method were compared to analyze the impact of centrifugal force field on the test results. It was indicated that, there were two phases in the consolidation process of saturated soft soil in centrifugal model test, namely the quick consolidation and the sequent slow consolidation. The quick consolidation process was mainly influenced by centrifugal acceleration. The bigger the centrifugal acceleration was, the greater the test results would deviate from theoretical calculations. Even if centrifugal acceleration was between 48 and 71 g, the thicker the soil sample was, the greater the test results would deviate from theoretical calculations. The double-sided drainage consolidation of soft clay could be qualitatively analyzed with centrifugal model tests.

关 键 词： 岩土工程 饱和软粘土 数值分析 离心模型试验 孔隙水压力

领　　域： [建筑科学] [建筑科学] [建筑科学] [建筑科学]