4.7 Article

Freeze-thaw depth prediction with constrained optimization for spring load restriction

期刊

TRANSPORTATION GEOTECHNICS
卷 26, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.trgeo.2020.100419

关键词

Spring load restriction; Freeze/thaw depth prediction; Field measurement; Constrained optimization; Freezing/Thawing index

资金

  1. Michigan Department of Transportation [MDOT OR 16-009]

向作者/读者索取更多资源

The study introduces a constrained optimization approach to predict freezing depth (FD) and thawing depth (TD) for accurate decision-making on spring load restrictions (SLR). Results show that the constrained optimization method outperforms non-constrained optimization in accurately predicting FD and TD, enabling precise SLR decisions. Additionally, the study questions the accuracy of using a Thawing Index (TI)/Freezing Index (FI) ratio of 0.3 for SLR removal dates in the U.S., suggesting that the FD and TD prediction model is more reliable for decision-making. This methodology presents a practical tool for road engineers and provides insights for preventing freeze-thaw induced damages in cold regions.
Spring Load Restriction (SLR) policies have been widely implemented in many countries to reduce the cost of road repair for freeze-thaw induced damages in cold regions occurring in the spring thawing season. In most SLR policies, accurate predictions of the Freezing Depth (FD) and Thawing Depth (TD) are very critical because both FD and TD directly determine the dates for the SLR initiation and removal. In this study, we propose a new constrained optimization approach to predict FD and TD and evaluate this approach for making SLR decisions with field measurements collected at four sites during two adjacent year cycles. The evaluation results showed that constrained optimization can not only accurately predict FD and TD with a determination coefficient of higher than 0.91 for most sites, but enable FD to meet TD in the thawing season for accurate SLR-decision making, which, however, cannot be achieved using non-constrained optimization widely adopted in the literature. We also discuss the accuracy of using a Thawing Index (TI)/Freezing Index (FI) ratio of 0.3 that still has been used by several agencies in the U.S. to determine the removal date of SLR. Our results indicated that on the true SLR removal dates, a TI/FI ratio is not equal even close to 0.3 for most sites. By comparison, a TI/FI ratio of 0.3 will be less accurate than the FD and TD prediction model for SLR decision-making. The methodology reported in this study is easy to use and implement for road engineers and the insights will help make accurate SLR decisions to prevent roads in cold regions from freeze-thaw induced damages.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据