用于智能压实的振动压路机和分层非饱和路基耦合模型

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-10-10 DOI:10.1016/j.compgeo.2024.106827
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引用次数: 0

摘要

为了给智能压实提供理论指导,本研究提出了一种高效的分析模型,该模型考虑了振动压路机与分层基层之间的耦合动态相互作用。振动压路机采用集合参数模型进行模拟,而基层则被描述为分层非饱和孔弹性介质。利用双傅立叶变换求解了控制方程,从而得出了这一完全耦合模型的稳态解。通过与已公布的分析结果和现场测试结果进行比较,验证了所提模型的正确性。结果表明,压路机滚筒的垂直加速度响应对基层模量的变化非常敏感。然而,在评估当前填充层的模量时,必须考虑下层对压路机滚筒加速度响应的影响,尤其是当现有基层厚度小于 2 米时。对于现有基层厚度小于 2 米的基层质量评估,建议采用低频激振载荷,以最大限度地提高灵敏度;而对于较厚的现有基层,可同时采用低频和高频激振载荷。
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Coupled vibratory roller and layered unsaturated subgrade model for intelligent compaction
To provide theoretical guidance for intelligent compaction, this study proposes an efficient analytical model that considers the coupled dynamic interaction between a vibratory roller and a layered subgrade. The vibratory roller is simulated using a lumped parameter model, while the subgrade is characterized as a layered unsaturated poroelastic medium. The governing equations are solved using the double Fourier transform to derive the steady-state solution of this fully coupled model. The correctness of the proposed model is verified by comparing it with published analytical results and field test results. Results indicate that the vertical acceleration response of the roller drum is sensitive to variations in subgrade modulus. However, when evaluating the modulus of the current filling layer, it is crucial to consider the effects of the underlying layer on the acceleration response of the roller drum, especially when the existing subgrade thickness is less than 2 m. The influence of excitation frequency on the sensitivity of vertical acceleration response is found to be significant. For subgrade quality assessment with existing subgrade thickness less than 2 m, a low-frequency excitation load is recommended to maximize sensitivity, while both low and high excitation frequencies can be employed for thicker existing subgrades.
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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