Experimental and numerical study on the shear deformation characteristics of the loess-concrete interfaces
The mechanical properties of loess-concrete interfaces affect the stability and durability of engineering structures in loess regions. However, the combined effects on deformation behavior under varying loess parameters with normal stress conditions and micromechanical evolution properties at the lo...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-09-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025027057 |
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| author | Liang Zhang Tiehang Wang Zhilang You Zaikun Zhao Jiabin Ruan Yuxin Xue |
| author_facet | Liang Zhang Tiehang Wang Zhilang You Zaikun Zhao Jiabin Ruan Yuxin Xue |
| author_sort | Liang Zhang |
| collection | DOAJ |
| description | The mechanical properties of loess-concrete interfaces affect the stability and durability of engineering structures in loess regions. However, the combined effects on deformation behavior under varying loess parameters with normal stress conditions and micromechanical evolution properties at the loess-concrete interface remain insufficiently understood. Direct shear tests were conducted to examine the combined effects of water content and dry density with varying normal stress conditions on deformation and mechanical response. Gypsum powder lines were adopted to capture horizontal displacement, and the shear zone thickness was quantified using the single change-point slope method. In addition, the discrete element method (DEM) was applied to simulate the shear process and reveal micromechanical evolution properties. Results show that increasing water content reduces shear band thickness and interface shear stress, although this effect diminishes with high normal stress. Similarly, the influence of dry density on deformation and shear stress is also weakened under elevated normal stress. DEM simulations closely matched the experimental results and reproduced micromechanical evolution features of the shear process. The evolution of force chains, stress fields, coordination number, and porosity exhibited strong directionality opposite to the shear direction, reflecting consistency between microscopic responses and macroscopic behavior. |
| format | Article |
| id | doaj-art-129f40fe30384f558a2b13dbba542025 |
| institution | Kabale University |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-129f40fe30384f558a2b13dbba5420252025-08-20T03:41:57ZengElsevierResults in Engineering2590-12302025-09-012710663810.1016/j.rineng.2025.106638Experimental and numerical study on the shear deformation characteristics of the loess-concrete interfacesLiang Zhang0Tiehang Wang1Zhilang You2Zaikun Zhao3Jiabin Ruan4Yuxin Xue5School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, 710055, China; Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi′an, Shaanxi, 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, 710055, China; Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi′an, Shaanxi, 710055, China; Corresponding author.School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, 710055, ChinaSchool of Highway, Chang’an University, Xi’an 710064, ChinaThe mechanical properties of loess-concrete interfaces affect the stability and durability of engineering structures in loess regions. However, the combined effects on deformation behavior under varying loess parameters with normal stress conditions and micromechanical evolution properties at the loess-concrete interface remain insufficiently understood. Direct shear tests were conducted to examine the combined effects of water content and dry density with varying normal stress conditions on deformation and mechanical response. Gypsum powder lines were adopted to capture horizontal displacement, and the shear zone thickness was quantified using the single change-point slope method. In addition, the discrete element method (DEM) was applied to simulate the shear process and reveal micromechanical evolution properties. Results show that increasing water content reduces shear band thickness and interface shear stress, although this effect diminishes with high normal stress. Similarly, the influence of dry density on deformation and shear stress is also weakened under elevated normal stress. DEM simulations closely matched the experimental results and reproduced micromechanical evolution features of the shear process. The evolution of force chains, stress fields, coordination number, and porosity exhibited strong directionality opposite to the shear direction, reflecting consistency between microscopic responses and macroscopic behavior.http://www.sciencedirect.com/science/article/pii/S2590123025027057Loess-concrete interfaceShear band deformationDirect shear testMesoscopic simulationShear process evolution |
| spellingShingle | Liang Zhang Tiehang Wang Zhilang You Zaikun Zhao Jiabin Ruan Yuxin Xue Experimental and numerical study on the shear deformation characteristics of the loess-concrete interfaces Results in Engineering Loess-concrete interface Shear band deformation Direct shear test Mesoscopic simulation Shear process evolution |
| title | Experimental and numerical study on the shear deformation characteristics of the loess-concrete interfaces |
| title_full | Experimental and numerical study on the shear deformation characteristics of the loess-concrete interfaces |
| title_fullStr | Experimental and numerical study on the shear deformation characteristics of the loess-concrete interfaces |
| title_full_unstemmed | Experimental and numerical study on the shear deformation characteristics of the loess-concrete interfaces |
| title_short | Experimental and numerical study on the shear deformation characteristics of the loess-concrete interfaces |
| title_sort | experimental and numerical study on the shear deformation characteristics of the loess concrete interfaces |
| topic | Loess-concrete interface Shear band deformation Direct shear test Mesoscopic simulation Shear process evolution |
| url | http://www.sciencedirect.com/science/article/pii/S2590123025027057 |
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