A study on settlements of road embankments on soft ground using vertical drains

Toan Trinh Dinh
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Abstract

In civil engineering, the study of embankment settlement on soft ground is a vital geotechnical task in order to maintain serviceability of the road embankment, pavement, and facilities. This paper presents a study on settlements of road embankment on soft ground using vertical drains, including prefabricated-vertical drain (PVD), sand drain (SD), and sand compaction pile (SCP) on a number of packages of Hanoi – Haiphong Expressway Construction Project. The effectiveness of settlement prediction of vertical drain solutions is evaluated considering the ratios between the observed consolidation settlements and settlements predicted in the Detailed Design, in relation to the thickness of soft soil and the depth of treatment. Regression analysis is used to establish the correlation between the observed settlement and the height of embankment. The results show that (i) the design generally overestimated settlements; (ii) the ratios between observed and predicted settlements tend to positively correlate with the thickness of soft soil and the depth of treatment, and (iii) there are positive correlations between the height of embankment and the observed settlement. These correlations can be a valuable source of reference for anticipating settlements in basic design of highway projects with soft ground treated by vertical drains, in the regions that have geological stratum similar to Thabinh and Haihung formations of Bacbo Plain
使用垂直排水沟对软土路堤沉降的研究
在土木工程中,为了保持路堤、路面和设施的可用性,研究软土地基上的路堤沉降是一项重要的岩土工程任务。本文介绍了河内-海防高速公路建设项目的多个工程包中使用垂直排水沟(包括预制垂直排水沟 (PVD)、砂排水沟 (SD) 和砂压实桩 (SCP))对软土地基上路堤沉降的研究。根据观测到的固结沉降与详细设计中预测的沉降之间的比率,结合软土厚度和处理深度,对垂直排水解决方案的沉降预测效果进行了评估。采用回归分析法确定观测沉降与路堤高度之间的相关性。结果表明:(i) 设计普遍高估了沉降量;(ii) 观测沉降量与预测沉降量之比往往与软土厚度和处理深度呈正相关;(iii) 堤坝高度与观测沉降量呈正相关。在地质地层类似于八宝平原的塔宾地层和海雄地层的地区,这些相关性可以为采用垂直排水系统处理软土地基的公路项目的基本设计中预测沉降提供有价值的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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