Thermo-Mechanical Weathering in Malan Loess Under Thermal Shocks
Extreme climatic conditions characterized by drastic temperature fluctuations exacerbate soil erosion through intensified thermo-mechanical weathering processes. Loess-covered regions are particularly vulnerable to such conditions because of the inherent thermo-sensitivity of loess. A comprehensive...
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MDPI AG
2025-05-01
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| author | Yangqing Gong Yanrong Li Shengdi He |
| author_facet | Yangqing Gong Yanrong Li Shengdi He |
| author_sort | Yangqing Gong |
| collection | DOAJ |
| description | Extreme climatic conditions characterized by drastic temperature fluctuations exacerbate soil erosion through intensified thermo-mechanical weathering processes. Loess-covered regions are particularly vulnerable to such conditions because of the inherent thermo-sensitivity of loess. A comprehensive investigation of mechanisms of thermo-mechanical weathering in loess under extreme temperature regimes holds critical importance for elucidating soil degradation patterns. It is also essential for formulating mitigation strategies in climate-sensitive loess terrains, especially given the increasing frequency of extreme weather events under global warming scenarios. This study employed integrated physical monitoring experiments and numerical modeling. The evolutionary patterns of temperature fields and corresponding thermal stress distributions in loess subjected to both heat shock (rapid heating) and cold shock (rapid cooling) conditions were systematically examined. The key findings are as follows: (1) Soil temperature variations demonstrate phase-lagged responses to ambient thermal variations during both shock scenarios, exhibiting distinct thermal inertia effects. (2) The spatial distribution pattern of thermal stress is predominantly governed by the temperature gradient within the soil matrix. (3) While the magnitude ranges of thermal stress remain comparable between shock types, their directional characteristics fundamentally differ; heat shocks induce surface compressive stresses and internal tensile stresses, whereas cold shocks generate inverse stress patterns. (4) Compared to heat shock, cold shocks trigger obvious surface degradation through tensile stress-induced failure of particle bonds. These mechanically weakened zones establish favorable conditions for subsequent erosion processes in loess landscapes. |
| format | Article |
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| institution | DOAJ |
| issn | 1424-8220 |
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| publishDate | 2025-05-01 |
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| spelling | doaj-art-4d701f395997429892e3708c6b2c605f2025-08-20T03:12:04ZengMDPI AGSensors1424-82202025-05-012510311510.3390/s25103115Thermo-Mechanical Weathering in Malan Loess Under Thermal ShocksYangqing Gong0Yanrong Li1Shengdi He2Department of Engineering Geology, Faculty of Geological and Surveying Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaDepartment of Engineering Geology, Faculty of Geological and Surveying Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaDepartment of Engineering Geology, Faculty of Geological and Surveying Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaExtreme climatic conditions characterized by drastic temperature fluctuations exacerbate soil erosion through intensified thermo-mechanical weathering processes. Loess-covered regions are particularly vulnerable to such conditions because of the inherent thermo-sensitivity of loess. A comprehensive investigation of mechanisms of thermo-mechanical weathering in loess under extreme temperature regimes holds critical importance for elucidating soil degradation patterns. It is also essential for formulating mitigation strategies in climate-sensitive loess terrains, especially given the increasing frequency of extreme weather events under global warming scenarios. This study employed integrated physical monitoring experiments and numerical modeling. The evolutionary patterns of temperature fields and corresponding thermal stress distributions in loess subjected to both heat shock (rapid heating) and cold shock (rapid cooling) conditions were systematically examined. The key findings are as follows: (1) Soil temperature variations demonstrate phase-lagged responses to ambient thermal variations during both shock scenarios, exhibiting distinct thermal inertia effects. (2) The spatial distribution pattern of thermal stress is predominantly governed by the temperature gradient within the soil matrix. (3) While the magnitude ranges of thermal stress remain comparable between shock types, their directional characteristics fundamentally differ; heat shocks induce surface compressive stresses and internal tensile stresses, whereas cold shocks generate inverse stress patterns. (4) Compared to heat shock, cold shocks trigger obvious surface degradation through tensile stress-induced failure of particle bonds. These mechanically weakened zones establish favorable conditions for subsequent erosion processes in loess landscapes.https://www.mdpi.com/1424-8220/25/10/3115loessheat shockcold shockweatheringsoil erosion |
| spellingShingle | Yangqing Gong Yanrong Li Shengdi He Thermo-Mechanical Weathering in Malan Loess Under Thermal Shocks Sensors loess heat shock cold shock weathering soil erosion |
| title | Thermo-Mechanical Weathering in Malan Loess Under Thermal Shocks |
| title_full | Thermo-Mechanical Weathering in Malan Loess Under Thermal Shocks |
| title_fullStr | Thermo-Mechanical Weathering in Malan Loess Under Thermal Shocks |
| title_full_unstemmed | Thermo-Mechanical Weathering in Malan Loess Under Thermal Shocks |
| title_short | Thermo-Mechanical Weathering in Malan Loess Under Thermal Shocks |
| title_sort | thermo mechanical weathering in malan loess under thermal shocks |
| topic | loess heat shock cold shock weathering soil erosion |
| url | https://www.mdpi.com/1424-8220/25/10/3115 |
| work_keys_str_mv | AT yangqinggong thermomechanicalweatheringinmalanloessunderthermalshocks AT yanrongli thermomechanicalweatheringinmalanloessunderthermalshocks AT shengdihe thermomechanicalweatheringinmalanloessunderthermalshocks |