The theoretical freezing model of sandstone considering the statistical arrangement of pore structure

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-11-17 DOI:10.1016/j.coldregions.2024.104366

Hui Zhang , Yugui Yang , Chengzheng Cai , Shanshan Hou , Chenxiang Li

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Abstract

It is of great significance to understand the evolution law of unfrozen water content in frozen rocks to maintain the stability of geotechnical engineering in cold regions. Due to the different particle sizes and shapes, coupled with the diversity of cements, the internal pore structures of rocks are complex and diverse. In this study, a theoretical model for freezing point of sandstone is proposed based on the characteristics of microscopic pore structures. The characteristic of freezing point is analyzed by considering the mineral particle arrangement. A statistical theoretical model of unfrozen water in sandstone is established according to the random arrangement of mineral particles. The influence of the stacking angle of mineral particles following the normal distribution on unfrozen water content is analyzed. Finally, the NMR freezing process analysis for sandstones was carried out. The results show that the statistical theoretical model of unfrozen water fits the experimental results well. The effect of the average value of stacking angle on unfrozen water content is mainly due to the change of pore size, which leads to the change of pore water content. The standard deviation of stacking angle determines the residual water content.

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考虑孔隙结构统计排列的砂岩理论冻结模型

了解冻结岩石中未冻结含水量的演变规律，对于保持寒冷地区岩土工程的稳定性具有重要意义。由于岩石的颗粒大小和形状不同，再加上胶结物的多样性，岩石内部孔隙结构复杂多样。本研究根据微观孔隙结构的特点，提出了砂岩凝固点的理论模型。通过考虑矿物颗粒的排列来分析凝固点的特征。根据矿物颗粒的随机排列，建立了砂岩中未冻结水的统计理论模型。分析了服从正态分布的矿物颗粒堆积角对解冻水含量的影响。最后，对砂岩进行了核磁共振冷冻过程分析。结果表明，解冻水的统计理论模型很好地拟合了实验结果。堆积角平均值对解冻含水量的影响主要是由于孔隙大小的变化导致孔隙含水量的变化。堆积角的标准偏差决定了残余含水量。

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来源期刊

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.