[文献]利用软土蠕变模型预测路堤沉降(Soft Soil Creep model)

1 论文

Published Online: October 22, 2020

Prediction of embankment settlement on Swedish peat using the Soft Soil Creep model 利用软土蠕变模型预测瑞典泥炭上的路堤沉降情况 

Abstract: Despite the prevalence of peat in northern areas of Europe and elsewhere there are comparatively few case histories of carefully monitored embankments constructed directly on peat. In addition the use of relatively advanced and commercially available numerical models for prediction of the settlement in peat have only infrequently been documented. Practicing geotechnical engineers lack advice on the use of such models and in particular on the selection of the input parameters. This paper demonstrates that a combination of routine oedometer tests, careful use of published correlations and simulations of independent data can provide reliable input parameters. The work demonstrates a good match between field measurements and simulations but shows that it is difficult to model all stages of loading accurately with one set of input parameters. The user may need to focus on what specific output is critical and a number of analyses may be needed to obtain accurate prediction for all cases. Although the focus of the model used was on creep prediction, the work demonstrates that, other benefits of using a finite element analysis over hand calculations, such as modelling layers, buoyancy, variation in  parameters such as permeability with strain and time are perhaps more important than creep.

Keywords: peat settlement creep numerical model

摘要：尽管欧洲北部地区和其他地方普遍存在泥炭，但直接在泥炭上建造的经过仔细监测的堤防的案例相对较少。此外，使用相对先进的商业数值模型来预测泥炭中的沉降也很少被记录下来。在实践中，岩土工程师缺乏对这些模型的使用，特别是对输入参数的选择的建议。本文证明，结合常规固结试验、谨慎使用已发表的相关性和独立数据的模拟，可以提供可靠的输入参数。该工作证明了现场测量和模拟之间的良好匹配，但显示出很难用一组输入参数准确地模拟所有阶段的载荷。用户可能需要关注哪些特定的输出是关键的，可能需要进行多次分析才能获得所有情况下的准确预测。虽然所使用的模型的重点是蠕变预测，但工作表明，使用有限元分析比手工计算的其他好处，如建模层、浮力、渗透率等参数随应变和时间的变化可能比蠕变更重要。

关键词：泥炭沉降蠕变数值模型

2 相关文献

1. Settlement prediction for an embankment on soft clay

2. Prediction of embankment settlement over soft soils 

3. Observational Methods for Predicting Embankment Settlement

4. Prediction of and countermeasures for embankment-related settlement in ultra-soft ground containing peat 

5. Prediction of Embankment Settlements by In-Situ Tests

6. Ground settlement prediction of embankment treated with prefabricated vertical drains in soft soil

Note: Soft-Soil-Creep Model是FLAC3D/2D新增加的本构模型

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