首页|A novel binary effective medium model to describe the prepeak stress-strain relationship of combined bodies of rock-like material and rock

A novel binary effective medium model to describe the prepeak stress-strain relationship of combined bodies of rock-like material and rock

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Combined bodies of rock-like material and rock are widely encountered in geotechnical engineering,such as tunnels and mines.The existing theoretical models describing the stress-strain relationship of a com-bined body lack a binary feature.Based on effective medium theory,this paper presents the governing equation of the"elastic modulus"for combined and single bodies under triaxial compressive tests.A bin-ary effective medium model is then established.Based on the compressive experiment of concrete-granite combined bodies,the feasibility of determining the stress threshold based on crack axial strain is discussed,and the model is verified.The model is further extended to coal-rock combined bodies of more diverse types,and the variation laws of the compressive mechanical parameters are then discussed.The results show that the fitting accuracy of the model with the experimental curves of the concrete-granite combined bodies and various types of coal-rock combined bodies are over 95％.The crack axial strain method can replace the crack volumetric strain method,which clarifies the physical meanings of the model parameters.The variation laws of matrix parameters and crack parameters are discussed in depth and are expected to be more widely used in geotechnical engineering.

Combined bodystress-strain relationshipHooke's lawEffective medium theoryStress threshold determination

Tienan Wang、Yue Zhai、Huan Gao、Yubai Li、Ruifeng Zhao

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School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710064,China

Key Laboratory of Mine Geological Disaster Hazard Mechanism and Control,Ministry of Natural Resources,Xi'an 710064,China

Major Program of National Natural Science Foundation of ChinaShaanxi Province Innovative Talent Promotion Plan-Science and Technology Innovation TeamCentral University Natural Science Innovation Team

419410192021TD-55300102262402

2023

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(5)
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