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Numerical Prediction of Stress-Deformation Behavior for a Bridge Approach Embankment on Soft Compressible Clay

机译：软可压缩黏土上桥路堤应力变形行为的数值预测

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The mechanically stabilized earth (MSE) approach embankments for a new state highway bridge across the Indian River were founded on 8-9 m of dense sand overlying a 20 m thick layer of soft, normally consolidated, high plasticity clay. Consolidation of the clay was accelerated through an array of prefabricated vertical (PV) drains. The instrumented 13.8m high fill was monitored during staged construction and for a period of 1.25 years after construction. The embankment settled more than 2 m, while large lateral spreading (～0.5 m) was restrained by overlying sand layers. The available site investigation data was carefully reinterpreted and a 2D finite element analyses was performed using rate-independent, effective stress models (Modified Cam-Clay and MIT-E3). The numerical predictions are generally in very good agreement with measured ground settlements and lateral deflections. This study highlights the importance of careful parameter selection in modeling the performance for soft ground construction in order to predict key features such as the asymmetric lateral spreading of the clay during consolidation.
机译：横跨印度河的新州际公路桥梁的机械稳定土（MSE）进近路堤建立在8-9 m的稠密砂土上，该砂土覆盖了20 m厚的通常固结的高塑性软土。通过一系列预制的垂直（PV）排水管可以加速粘土的固结。在分阶段施工期间以及施工后1.25年的时间内，对仪器仪表检测到的13.8m高的填充量进行了监控。路堤沉降超过2 m，而较大的横向扩展（〜0.5 m）受到上覆砂层的限制。仔细地重新解释了可用的现场调查数据，并使用与速率无关的有效应力模型（Modified Cam-Clay和MIT-E3）进行了2D有限元分析。数值预测通常与测得的地面沉降和横向挠度非常吻合。这项研究强调了在建模软土地基性能时要仔细选择参数的重要性，以便预测关键特征，例如固结过程中粘土的不对称横向扩展。

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