Physical properties and anisotropy of sandstone during freeze-thaw cycle under unidirectional constraint

IF 3.8 2区 工程技术 Q1 ENGINEERING, CIVIL
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Abstract

To investigate the evolution of physical properties of sandstone under unidirectional constraint during freeze-thaw cycles, an experimental device was specifically designed. Unidirectional constraint freeze-thaw tests were performed on sandstone specimens. The study analyzed variations in the dry mass, saturated mass, and longitudinal wave velocity of the sandstone both before and after undergoing freeze-thaw cycles, as well as examining the evolution of resistivity throughout the process. Results revealed that an increase in the number of freeze-thaw cycles leads to a gradual increase in the saturated mass of sandstone, while its dry mass consistently decreases, irrespective of whether it is subjected to constraint or not. The change rates of both dry mass and saturated mass were found to be significantly lower under unidirectional constraint compared to that without constraint. With more freeze-thaw cycles, a decline in longitudinal wave velocity was noted. Under unconstrained conditions, no significant direction dependence in longitudinal wave velocity was detected. However, under unidirectional constraint, there was a smaller decrease in the longitudinal wave velocity along the direction of constraint compared to other directions. This indicates that constraint mitigates frost heave damage. In the temperature rise and maintenance stages, resistivity initially dropped, then increased prior to stabilizing at a constant value. Conversely, in temperature decrease and maintenance stages, resistivity first rose, then dipped before ultimately rising again. Temperature primarily influenced resistivity by affecting the ion movement velocity within pore water and the connectivity of the conductive network.

单向约束下冻融循环过程中砂岩的物理性质和各向异性
为了研究冻融循环期间单向约束下砂岩物理性质的演变,我们专门设计了一套实验装置。对砂岩试样进行了单向约束冻融试验。研究分析了砂岩在经历冻融循环前后的干质量、饱和质量和纵波速度的变化,并考察了整个过程中电阻率的演变。结果表明,冻融循环次数的增加会导致砂岩饱和质量逐渐增加,而其干质量则持续减少,无论是否受到约束。在单向约束条件下,干质量和饱和质量的变化率都明显低于无约束条件下的变化率。冻融循环次数越多,纵波速度就越低。在无约束条件下,纵波速度没有发现明显的方向依赖性。然而,在单向约束条件下,与其他方向相比,沿约束方向的纵波速度下降幅度较小。这表明,约束可减轻冻胀破坏。在温度上升和维护阶段,电阻率先是下降,然后上升,最后稳定在一个恒定值上。相反,在温度下降和维护阶段,电阻率先是上升,然后下降,最后再次上升。温度主要通过影响孔隙水中的离子移动速度和导电网络的连通性来影响电阻率。
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来源期刊
Cold Regions Science and Technology
Cold Regions Science and Technology 工程技术-地球科学综合
CiteScore
7.40
自引率
12.20%
发文量
209
审稿时长
4.9 months
期刊介绍: Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.
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