Investigation of frozen rock behavior: mechanical properties, pore structure, and strength under confining pressures

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-02-15 DOI:10.1016/j.coldregions.2025.104451

Kun Wang , Jian-xin Fu , Meng Zhaobo , Zhang Bangyi

{"title":"Investigation of frozen rock behavior: mechanical properties, pore structure, and strength under confining pressures","authors":"Kun Wang , Jian-xin Fu , Meng Zhaobo , Zhang Bangyi","doi":"10.1016/j.coldregions.2025.104451","DOIUrl":null,"url":null,"abstract":"<div><div>Long-term low-temperature freezing in high-cold and high-altitude areas has greatly affected rock mass structure and rock physical and mechanical properties. The destruction process of frozen rock under different confining pressures was studied by triaxial rheometer, ultrasonic velocity analyzer and Lf-NMR. Based on the hydration signal, the energy and strength equations for rock aperture under different confining pressures are derived. Fractal dimension was used to characterize the pore structure. The study founded that the strength and deformation ability of frozen rocks are enhanced. High confining pressure increases rock deformation ability while reducing the effect of freezing cold on rock deformation. The elastic modulus of rock is more sensitive to freezing temperature. The fractures on the surface of frozen rock exhibit increased density and enhanced load-bearing ability. Rock and mineral particles shrink after freezing, and frost heave forces drive the formation and expansion of connecting pores. The freezing rate of pore water increases as the temperature decreases. The freezing rate of bound water in micropores is slower, and the fractal dimension is more susceptible to the influence of low temperature.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"234 ","pages":"Article 104451"},"PeriodicalIF":3.8000,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cold Regions Science and Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0165232X25000345","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

Long-term low-temperature freezing in high-cold and high-altitude areas has greatly affected rock mass structure and rock physical and mechanical properties. The destruction process of frozen rock under different confining pressures was studied by triaxial rheometer, ultrasonic velocity analyzer and Lf-NMR. Based on the hydration signal, the energy and strength equations for rock aperture under different confining pressures are derived. Fractal dimension was used to characterize the pore structure. The study founded that the strength and deformation ability of frozen rocks are enhanced. High confining pressure increases rock deformation ability while reducing the effect of freezing cold on rock deformation. The elastic modulus of rock is more sensitive to freezing temperature. The fractures on the surface of frozen rock exhibit increased density and enhanced load-bearing ability. Rock and mineral particles shrink after freezing, and frost heave forces drive the formation and expansion of connecting pores. The freezing rate of pore water increases as the temperature decreases. The freezing rate of bound water in micropores is slower, and the fractal dimension is more susceptible to the influence of low temperature.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

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.