Research on the characteristics of pore water distribution of calcium carbonate waste soil based on NMR tests

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-01-15 DOI:10.1007/s10064-024-04078-x

Jianxiao Gu, Haibo Lyu, Guoqiang Chen, Jiajia Wu, Yaoxingyu Chen

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Abstract

Understanding pore water distribution in soil is essential for elucidating water movement and mechanical properties, as it significantly influences soil strength and stability. Accurate assessment of this distribution provides a scientific foundation for civil engineering design, ensuring structural safety and durability. This study examines pore water distribution using plate load tests and Nuclear Magnetic Resonance (NMR). Results indicate that matric suction expels free water first, leaving bound water until a critical suction point is reached. As matric suction increases, the peak value of the T₂ relaxation time curve decreases, shifting leftward, reflecting water drainage from larger to smaller pores. Then, water expulsion occurs in three stages, with Stage III primarily indicating bound water content, quantified at 19.23%, including 3.3% as strongly bound water. An equation is derived to calculate the surface relaxation rate of 0.0176 μm/ms. Thus, the distribution of T₂ relaxation time can be transformed into pore size distribution, summarizing the characteristics of pore water distribution during the drying process. Finally, comparative analysis confirms the effectiveness of NMR in measuring bound water. These findings enhance our understanding of soil water distribution and highlight the need for advanced models that incorporate pore connectivity and water retention dynamics.

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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.