Micromechanical equivalent approaches for elastic property prediction of soil-rock mixtures
HOU Shiwei1, LIN Yuzhu1, ZHANG Pei2*, DU Xiuli3, MENG Suyun1, LIU Xiaoqiang1
(1. School of Civil Engineering, Shenyang Jianzhu University, Shenyang, Liaoning 110168, China; 2. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102616, China;
3. Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education,
Beijing University of Technology, Beijing 100124, China)
Abstract：The soil-rock mixture is a composite material consisting of fine-grained soil, rock blocks, pores, and voids. Its macroscopic mechanical properties are closely linked to its internal mesoscale components. This paper focuses on the macroscopic elastic properties of soil-rock mixtures and proposes a stepwise equivalent homogenization prediction method by integrating micro-porosity theory, interface phase theory, and Eshelby′s inclusion theory. The validity of this method is confirmed through numerical tests and laboratory experiments. Furthermore, the paper investigates how the macroscopic elastic modulus of soil-rock mixtures varies with changes in internal mesostructure. The results indicate that the proposed theoretical method effectively predicts the macroscopic elastic modulus and Poisson′s ratio of soil-rock mixtures. When the rock content is below 60%, the difference between the predicted elastic modulus and experimental results is minimal. Under the same rock content, the macroscopic elastic modulus decreases with increasing void content and rises with the inclination angle of the long axis. When the long-axis inclination angle is between 0° and 50°, the macroscopic elastic modulus is positively correlated with the aspect ratio; however, it exhibits a negative correlation at inclination angles ranging from 50° to 90°.
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2026, Vol. 45 
