Abstract This paper presents the performance monitoring results and long-term numerical analyses of a 2.8-m-high test embankment with vertical drains on soft highly compressible clays during a four years and two months observation period (1525 days). The peculiar study site is characterized by thick layers of lacustrine soft clay with water contents up to 300%, void ratios between 7 and 9 and ratios Cα/Cc range from 0.06 to 0.03. The loading applied by the test embankment was 43.4 kPa. The vertical drains installed were of two types: sand and prefabricated. The settlements that only take into account the effect of the preloading embankment at the end of the observation period were 2.62 m and 2.71 m, in the zones with sand and prefabricated vertical drains, respectively. The settlement measured by regional subsidence was 0.47 m. The ultimate primary settlement was approximately 2.0 m and was estimated by two observational methods based on field settlement records. The settlement developed by secondary consolidation in the embankment ranged from 0.62 m to 0.71 m at the end of the observation period. The test embankment behavior was simulated by 2D and 3D numerical analyses. The 2D analyses used a theory to convert the axisymmetric drainage into plane drainage. The long-term numerical results and the field measurements were compared and discussed.

中文翻译：

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在 Texcoco 湖相软粘土上进行预加载和垂直排水试验路堤的性能监测和数值评估

摘要 本文介绍了在四年零两个月的观察期（1525 天）内，在软质高压缩粘土上垂直排水的 2.8 米高测试路堤的性能监测结果和长期数值分析。独特的研究地点的特点是厚层湖相软粘土，含水量高达300%，孔隙比在7-9之间，Cα/Cc比在0.06-0.03之间。试验路堤施加的荷载为 43.4 kPa。安装的垂直排水管有两种类型：沙子和预制。观察期末仅考虑预压路堤影响的沉降区分别为2.62 m和2.71 m，分布在有沙区和预制垂直排水沟区。区域沉降测量的沉降为0.47 m。最终的初级沉降约为 2.0 m，根据实地沉降记录通过两种观测方法估计。观测期末路堤二次固结形成的沉降范围为0.62 m～0.71 m。测试路堤行为通过 2D 和 3D 数值分析进行模拟。二维分析使用一种理论将轴对称排水转换为平面排水。对长期数值结果和现场测量结果进行了比较和讨论。二维分析使用一种理论将轴对称排水转换为平面排水。对长期数值结果和现场测量结果进行了比较和讨论。二维分析使用一种理论将轴对称排水转换为平面排水。对长期数值结果和现场测量结果进行了比较和讨论。