1.青岛理工大学理学院,山东 青岛 266520
2.青岛理工大学海洋环境混凝土技术教育部工程研究中心,山东 青岛 266520
3.大连理工大学运载工程与力学学部,辽宁 大连 116024
4.广西交科集团有限公司,广西 南宁,530007
牛庚(1991—),男,讲师,博士,硕导。主要从事非饱和土力学研究。E-mail:niugeng@qut.edu.cn
孔亮(1969—),男,教授,博士,博导。主要从事岩土工程方面的研究。E-mail: qdkongliang@163.com
收稿:2023-01-04,
修回:2023-03-24,
纸质出版:2023-08-28
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牛庚,郭晓霞,陈凡秀等.水‑力作用下黏土孔隙结构演化规律研究进展[J].防灾减灾工程学报,2023,43(04):905-916.
NIU Geng,GUO Xiaoxia,CHEN Fanxiiu,et al.Research Progress on Evolution Law of Clay Pore Structure under Hydro‑mechanical Effect[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):905-916.
牛庚,郭晓霞,陈凡秀等.水‑力作用下黏土孔隙结构演化规律研究进展[J].防灾减灾工程学报,2023,43(04):905-916. DOI: 10.13409/j.cnki.jdpme.20230104004.
NIU Geng,GUO Xiaoxia,CHEN Fanxiiu,et al.Research Progress on Evolution Law of Clay Pore Structure under Hydro‑mechanical Effect[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):905-916. DOI: 10.13409/j.cnki.jdpme.20230104004.
黏土的微结构直接决定宏观水‑力学特性,然而现阶段绝大多数模型都是基于宏观参数所建立,由于缺乏微观机制的支撑,己经难以满足科研和工程需求。因此开展孔隙结构演化研究可以加深对非饱和土复杂水‑力学特性的认识。在详细阐述黏土的孔径分布特征及双孔模型的基础上,全面回顾和总结了近年来水‑力作用下黏土孔隙结构演化规律的研究成果与最新进展,并进行了相关讨论。结果表明:考虑颗粒集聚体的双孔模型(集聚体间孔隙与集聚体内孔隙)可以更好地解释黏土复杂的水‑力学特性。水‑力作用对黏土孔隙结构的影响机制不同,根据文献试验数据和理论分析初步总结出水‑力作用下土孔隙结构的演化规律。外力荷载只显著影响集聚体间孔隙,对集聚体内孔隙基本不影响;含水率变化会改变土颗粒相对位置,继而影响这两类孔隙结构,但是土水相互作用复杂,导致含水率变化对土孔隙结构影响机制仍不清晰,并且没有统一认识。鉴于此,在研究土水相互作用对微观孔隙影响时应充分考虑物理‑化学作用,并构建微观孔隙结构演化与宏观变形的定量关系,这也是今后需要深入研究的方向。
Macroscopic hydro-mechanical properties of clay are directly determined by the microstructure. However, at present, most of the models are established based on macro-parameters, which are difficult to meet the needs of scientific research and engineering due to the lack of micro-mechanisms support. The study of pore structure evolution can deepen the understanding of the complex hydro-mechanical properties of unsaturated soil. Based on the detailed description of pore size distribution characteristics and the dual pore model of clay, the research results and latest progress of pore structure evolution law of clay under hydro-mechanical action in recent years are comprehensively reviewed and summarized, and relevant discussions are carried out. The results show that the dual pore model (inter-aggregate pores and intra-aggregate pores) considering particle aggregates can better explain the complex hydro-mechanical properties of clay. Under the hydro-mechanical action, the evolution laws of the pore structure are different. Based on test data and theoretical analysis in literature, the evolution laws of pore structure under hydro-mechanical effect are preliminarily summarized. External loading only significantly affects inter-aggregate pore space, and basically has no effect on intra-aggregate pore space. Changes in water content will alter the relative position of soil particles, which then affects the two types of pore structure, but the complexity of soil-water interactions leads to unclear mechanisms and a lack of unified understanding of the impact of moisture content changes on soil pore structures. In view of the above, the physical-chemical interaction should be fully considered when studying the effect of soil-water interaction on micro-pores, and the quantitative relationship between the evolution of micro-pore structure and macro-deformation should be established, which is also the direction for further research in the future.
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