Evaluating Pavement Performance on Expansive Clay Soils Subjected to Cyclic Shrinkage and Swelling  

作　　者：Edem Chabi Guy Oyéniran Adéoti Marx Ferdinand Ahlinhan Ludovic Metognissè Agassoussi Edem Chabi;Guy Oyéniran Adéoti;Marx Ferdinand Ahlinhan;Ludovic Metognissè Agassoussi(Laboratory of Energetics and Applied Mechanics (LEMA), Abomey-Calavi, Republic of Benin;Laboratory of Rural Engineering (LGR), School of Rural Engineering (EGR), National University of Agriculture (UNA), Ketou, Republic of Benin;Higher National School of Public Works (ENSTP), Abomey, Republic of Benin;Laboratory of Testing and Studies in Civil Engineering (L2EGC), National University of Science, Technology, Engineering, and Mathematics (UNSTIM), Abomey, Republic of Benin)

机构地区：[1]Laboratory of Energetics and Applied Mechanics (LEMA), Abomey-Calavi, Republic of Benin [2]Laboratory of Rural Engineering (LGR), School of Rural Engineering (EGR), National University of Agriculture (UNA), Ketou, Republic of Benin [3]Higher National School of Public Works (ENSTP), Abomey, Republic of Benin [4]Laboratory of Testing and Studies in Civil Engineering (L2EGC), National University of Science, Technology, Engineering, and Mathematics (UNSTIM), Abomey, Republic of Benin

出　　处：《Open Journal of Applied Sciences》2025年第1期70-97,共28页应用科学(英文)

摘　　要：Expansive soils, prone to being influenced by the environmental conditions, undergo expansion when water is introduced and shrinkage upon drying. This persistent volumetric fluctuation can induce differential movements and result in cracking of structures erected upon them. The present research focuses on characterizing the behavior of pavements erected on expansive clays subjected to swelling and shrinkage cycles. Direct shear tests and oedometer tests were conducted in the laboratory on samples of expansive soils undergoing swelling-shrinkage cycles. The experimental data reveal a significant decrease in shear strength, evidenced by a reduction in shear parameters (internal friction angle, cohesion) and a decrease in the modulus of elasticity as the number of cycles increases. A numerical model based on the finite element method was developed to simulate the behavior of a pavement on an expansive clay substrate. The model results indicate an increase in total displacements with the increase in the number of shrinkage-swelling cycles, demonstrating a progressive degradation of the soil’s mechanical behavior. This study contributes to a better understanding of the complex phenomena governing the behavior of expansive soils and serves as a foundation for developing effective management and mitigation strategies for road infrastructures.Expansive soils, prone to being influenced by the environmental conditions, undergo expansion when water is introduced and shrinkage upon drying. This persistent volumetric fluctuation can induce differential movements and result in cracking of structures erected upon them. The present research focuses on characterizing the behavior of pavements erected on expansive clays subjected to swelling and shrinkage cycles. Direct shear tests and oedometer tests were conducted in the laboratory on samples of expansive soils undergoing swelling-shrinkage cycles. The experimental data reveal a significant decrease in shear strength, evidenced by a reduction in shear parameters (internal friction angle, cohesion) and a decrease in the modulus of elasticity as the number of cycles increases. A numerical model based on the finite element method was developed to simulate the behavior of a pavement on an expansive clay substrate. The model results indicate an increase in total displacements with the increase in the number of shrinkage-swelling cycles, demonstrating a progressive degradation of the soil’s mechanical behavior. This study contributes to a better understanding of the complex phenomena governing the behavior of expansive soils and serves as a foundation for developing effective management and mitigation strategies for road infrastructures.

关 键 词：Differential Soil Displacement Expansive Soil PAVEMENT Shear Strength Shrinkage-Swelling Cycles Soil Degradation Behaviour 

分 类 号：S15[农业科学—土壤学]