A calculation method for uneven collapsible deformation of soil between compaction piles in loess area

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-06-30 DOI:10.1007/s10064-025-04403-y

Xiaoxiao Liu, Hua Huang, Xi Liu, Liang Wang, Qinghui Liu, Yaohua Liu

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Abstract

Collapsible loess is prone to significant deformation under the influence of water and load, leading to severe engineering problems and disasters. Compaction pile, a common method to address loess collapsibility, often suffers from design inefficiencies. In order to address this issue, it is necessary to quantitatively evaluate the collapsible deformation after compaction treatment. This paper introduces the concept of the compaction coefficient, derived through theoretical analysis based on the SMP strength criterion and the associated flow rule. The impact of soil parameters on the compaction coefficient is examined. Using indoor model tests of pile sinking and compaction combined with electron microscope scanning, the compaction coefficient at various positions between piles is determined. The numerical calculation results from subroutine development are compared with theoretical and experimental findings, verifying the accuracy of the proposed compaction coefficient. Additionally, indoor collapsibility experiments establish the relationship between the collapsibility coefficient and the compaction coefficient, as well as the variation of the collapsibility coefficient with pressure, which is then incorporated into a programming language. Finally, a numerical calculation method for collapsible deformation based on the Abaqus subroutine is proposed and validated through indoor model collapsibility experiments.

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黄土地区压实桩间土体不均匀湿陷变形计算方法

湿陷性黄土在水和荷载的作用下容易发生较大的变形，造成严重的工程问题和灾害。压实桩是解决黄土湿陷性的常用方法，但往往存在设计效率低下的问题。为了解决这一问题，有必要对压实处理后的可湿陷变形进行定量评价。本文介绍了压实系数的概念，该概念是在SMP强度准则和相关流动规律的基础上，通过理论分析得出的。考察了土体参数对压实系数的影响。采用室内桩沉压模型试验，结合电镜扫描，确定了桩间各位置的压实系数。将子程序开发的数值计算结果与理论和实验结果进行了比较，验证了所提出的压实系数的准确性。此外，室内湿陷性实验建立了湿陷系数与压实系数的关系，以及湿陷系数随压力的变化，并将其纳入编程语言。最后，提出了一种基于Abaqus子程序的湿陷变形数值计算方法，并通过室内模型湿陷性试验进行了验证。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.