Creep characteristics of sandstone during freezing/thawing process

The rock mass in cold regions is always subjected to the load and freeze-thaw. If the impact of long-term freeze-thaw mechanical behavior on sandstone mass is neglected, it would lead to significant hazards to the construction and safe operation of engineering in cold regions. This study focused on...

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Main Authors: Yongjun SONG, Jinghui CAO, Keyan CHENG, Huimin YANG, Ran BI, Kun ZHANG
Format: Article
Language:zho
Published: Editorial Office of Hydrogeology & Engineering Geology 2024-11-01
Series:Shuiwen dizhi gongcheng dizhi
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Online Access:https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202309059
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author Yongjun SONG
Jinghui CAO
Keyan CHENG
Huimin YANG
Ran BI
Kun ZHANG
author_facet Yongjun SONG
Jinghui CAO
Keyan CHENG
Huimin YANG
Ran BI
Kun ZHANG
author_sort Yongjun SONG
collection DOAJ
description The rock mass in cold regions is always subjected to the load and freeze-thaw. If the impact of long-term freeze-thaw mechanical behavior on sandstone mass is neglected, it would lead to significant hazards to the construction and safe operation of engineering in cold regions. This study focused on the sandstone from a slope engineering in the cold region. The realistic long-term mechanical response characteristics of engineering rocks in cold regions was presented by uniaxial graded loading creep tests for the freezing/thawing process at different freezing temperatures and the same stress state. Then the effect of the freezing/thawing process on the long-term mechanical properties of the rock mass was investigated, and the macroscopic mechanical indexes, such as creep strain, steady-state creep rate, and long-term strength, were analyzed quantitatively. The results indicate that sandstone undergoes the stages of cold shrinkage, frost heave, and steady-state creep during the freezing process, and the stages of thaw consolidation and steady-state creep during the thawing process. Sandstone shrinkage deformation occurs during the cold shrinkage and thawing stages, while expansion deformation occurs during the frost heave stage. At freezing/thawing temperatures of −5 °C/25 °C, −10 °C/25 °C, and −15 °C/25 °C, compared to the creep strains at room temperature, the creep strains of the sandstone are amplified by 102%−193%, 81%−126%, and 105%−194%, respectively. The steady-state creep rate after thawing increases by 3.65, 4.31, and 5.56 times compared to the steady-state creep rate at room temperature. The long-term strength of the sandstones in the frozen/thawed state are 96.33%, 88.52%, and 75.44% of the long-term strength at room temperature, respectively. Stress inhibits the generation of cold shrinkage and freezing deformations and promotes the generation of thawing deformations. The freezing temperature affects frost heave deformation and thaw shrinkage deformation after thawing. As the freezing temperature decreases, the deformation increases. A test method combining creep with freeze-thaw processes has been proposed in the study, which can characterize the real engineering condition. This study provides a new method to evaluate the long-term stability of rock mass engineering in cold regions.
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publisher Editorial Office of Hydrogeology & Engineering Geology
record_format Article
series Shuiwen dizhi gongcheng dizhi
spelling doaj-art-1bd052e0cfa34ee680965b059866a37b2025-01-18T03:53:12ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652024-11-015169310310.16030/j.cnki.issn.1000-3665.202309059202309059Creep characteristics of sandstone during freezing/thawing processYongjun SONG0Jinghui CAO1Keyan CHENG2Huimin YANG3Ran BI4Kun ZHANG5School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaChina Metallurgical Group Northwest Geotechnical Engineering Co. Ltd., Xi’an, Shaanxi 710061, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaThe rock mass in cold regions is always subjected to the load and freeze-thaw. If the impact of long-term freeze-thaw mechanical behavior on sandstone mass is neglected, it would lead to significant hazards to the construction and safe operation of engineering in cold regions. This study focused on the sandstone from a slope engineering in the cold region. The realistic long-term mechanical response characteristics of engineering rocks in cold regions was presented by uniaxial graded loading creep tests for the freezing/thawing process at different freezing temperatures and the same stress state. Then the effect of the freezing/thawing process on the long-term mechanical properties of the rock mass was investigated, and the macroscopic mechanical indexes, such as creep strain, steady-state creep rate, and long-term strength, were analyzed quantitatively. The results indicate that sandstone undergoes the stages of cold shrinkage, frost heave, and steady-state creep during the freezing process, and the stages of thaw consolidation and steady-state creep during the thawing process. Sandstone shrinkage deformation occurs during the cold shrinkage and thawing stages, while expansion deformation occurs during the frost heave stage. At freezing/thawing temperatures of −5 °C/25 °C, −10 °C/25 °C, and −15 °C/25 °C, compared to the creep strains at room temperature, the creep strains of the sandstone are amplified by 102%−193%, 81%−126%, and 105%−194%, respectively. The steady-state creep rate after thawing increases by 3.65, 4.31, and 5.56 times compared to the steady-state creep rate at room temperature. The long-term strength of the sandstones in the frozen/thawed state are 96.33%, 88.52%, and 75.44% of the long-term strength at room temperature, respectively. Stress inhibits the generation of cold shrinkage and freezing deformations and promotes the generation of thawing deformations. The freezing temperature affects frost heave deformation and thaw shrinkage deformation after thawing. As the freezing temperature decreases, the deformation increases. A test method combining creep with freeze-thaw processes has been proposed in the study, which can characterize the real engineering condition. This study provides a new method to evaluate the long-term stability of rock mass engineering in cold regions.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202309059creep characteristicsfreezing/thawing processcold shrinkage strainfrost heave strainmelting shrinkage strain
spellingShingle Yongjun SONG
Jinghui CAO
Keyan CHENG
Huimin YANG
Ran BI
Kun ZHANG
Creep characteristics of sandstone during freezing/thawing process
Shuiwen dizhi gongcheng dizhi
creep characteristics
freezing/thawing process
cold shrinkage strain
frost heave strain
melting shrinkage strain
title Creep characteristics of sandstone during freezing/thawing process
title_full Creep characteristics of sandstone during freezing/thawing process
title_fullStr Creep characteristics of sandstone during freezing/thawing process
title_full_unstemmed Creep characteristics of sandstone during freezing/thawing process
title_short Creep characteristics of sandstone during freezing/thawing process
title_sort creep characteristics of sandstone during freezing thawing process
topic creep characteristics
freezing/thawing process
cold shrinkage strain
frost heave strain
melting shrinkage strain
url https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202309059
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AT jinghuicao creepcharacteristicsofsandstoneduringfreezingthawingprocess
AT keyancheng creepcharacteristicsofsandstoneduringfreezingthawingprocess
AT huiminyang creepcharacteristicsofsandstoneduringfreezingthawingprocess
AT ranbi creepcharacteristicsofsandstoneduringfreezingthawingprocess
AT kunzhang creepcharacteristicsofsandstoneduringfreezingthawingprocess