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IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-17 DOI:10.1007/s10064-024-04035-8

Lixiang Wang, Ying He, Xinjiang Song, Qinghui Lai, Haibo Xu, Dongdong Wang

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引用次数: 0

摘要

分散性粘土广泛分布于东北松嫩平原，对水利工程造成了严重的堤坝破坏，而相关的破坏机理研究尚不完善。本研究基于分散性粘土破坏的真实应力路径，采用平面应变条件下的力学实验方法研究了分散性粘土的强度特性。结果表明，在平面应变条件下，分散性粘土的应力-应变曲线呈现应变硬化型，有别于三轴垂直条件下的传统应变软化型，在固结应力为 50 kPa 时，强度差约为两倍。主应力的应力-应变关系也表现为应变硬化型，应力-应变关系近似线性。在低固结应力下，中间主应力系数达到 0.44，表明中间主应力对粘土强度有显著影响。在低固结应力下，分散性粘土的破坏模式表现为膨胀，没有明显的空间剪切带，而在高固结应力下，破坏模式表现为对角线方向的剪切带。此外，分散性粘土的强度特性因粘土中化学离子的浸出而减弱，在不同固结应力下表现出不同的压实性和强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Study on mechanical properties and embankment instability of dispersive clay under plane strain conditions in Songnen Plain China

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Study on mechanical properties and embankment instability of dispersive clay under plane strain conditions in Songnen Plain China

Dispersive clay is widely distributed in the Songnen Plain of northeast China, causing serious embankment damage to hydraulic engineering, and the research on the relevant failure mechanism is still incomplete. In this study, based on the real stress path of dispersive clay failure, a mechanical experimental method under plane strain conditions was adopted to investigate the strength properties of dispersive clay. The results showed that under plane strain conditions, the stress-strain curve of dispersive clay exhibited the strain hardening type, distincted from the conventional strain softening type under triaxial vertical conditions, and the strength difference was approximately twice at a consolidation stress of 50 kPa. The stress-strain relationship of the principal stress also showed the strain hardening type, and the relationship between the stress-strain was approximately linear. Under low consolidation stress, the coefficient of the intermediate principal stress reached 0.44, indicated a significant influence of the intermediate principal stress on the strength of the clay. Under low consolidation stress, the failure mode of dispersive clay was characterized by swelling with no obvious spatial shear band, while under high consolidation stress, the failure mode exhibited a shear band located diagonally. Additionally, the strength properties of dispersive clay were weakened by the leaching of chemical ions in the clay, showed different compaction and strength under different consolidation stresses.

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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.