利用机器学习算法,通过未扰动路基土的前后实验数据预测弹性模量

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-10-09 DOI:10.1016/j.trgeo.2024.101396
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引用次数: 0

摘要

路基弹性模量(MR)显示了路面系统在交通荷载作用下应力与单位变形之间的关系,是路面结构的设计参数。虽然在实验室中可以使用循环三轴试验设备直接测定路基的回弹模量,但考虑到时间和成本因素,利用基于易得土壤参数的预测模型是一种更有效的方法。我们设计了一个全面的实验室测试程序,利用机器学习(ML)算法创建 MR 预测模型。对 70 个未扰动土壤样本进行磁共振测试以及物理和工程土壤特性测试(含水量、现场密度、比重、等级、稠度极限、无侧限抗压强度、膨胀压力、膨胀百分比)。土壤样本是从一条已运营五年多的高速公路上钻取的。然后,使用 RF、GBM、LightGBM、CatBoost 和 XGBoost 算法等非线性回归模型。研究结果表明,非线性回归模型在预测 MR 方面优于线性回归模型(R2 > 0.85),其中 XGBoost 算法的准确度最高(R2 = 0.90)。除了约束压力(σ3)和偏差应力(σd)等主要影响因素外,研究还发现,在所有参数中,无压抗压强度(qu)、天然含水量(wn)和膨胀百分率(SR)是预测 MR 的重要参数。
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Prediction of resilient modulus with pre-post experimental data of undisturbed subgrade soils using machine learning algorithms
The resilient modulus (MR) of subgrade, which shows relationship between stress and unit deformation of a pavement systems under traffic loads, is a design parameter of the pavement structure. Although a cyclic triaxial test apparatus can be used to directly determine the MR of the subgrade in the laboratory, utilizing prediction models based on easily obtainable soil parameters, is a more efficient method when taking time and cost considerations into account. A comprehensive laboratory testing program is designed to create MR prediction models using machine learning (ML) algorithms. 70 undisturbed soil samples are subjected to MR tests, as well as physical and engineering soil properties tests (water content, field density, specific gravity, gradation, consistency limits, unconfined compressive strength, swell pressure, swell percentage). Soil samples are drilled from a highway that has been in operation for over five years.
First, a linear model like MLR is used in the study. Next, nonlinear regression models like RF, GBM, LightGBM, CatBoost, and XGBoost algorithms are used. Research findings showed that nonlinear regression models outperformed linear regression models in predicting the MR (R2 > 0.85), with the XGBoost algorithm yielding the best accuracy (R2 = 0.90). Apart from the primary effects such as confining pressure (σ3) and deviatoric stress (σd), it was found that unconfined compressive strength (qu), natural water content (wn), and swelling percentage (SR) are significant parameters in the prediction of MR among all parameters.
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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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