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Research on the influence of contact surface constraint on mechanical properties of rock-concrete composite specimens under compressive loads

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Frontiers of Structural and Civil Engineering 2020年第2期14卷 322-330页

作者： Baoyun ZHAO Yang LIU Dongyan LIU Wei HUANG Xiaoping WANG Guibao YU Shu LIU School of Civil Engineering and Architecture Chongqing University of Science and TechnologyChongqing 401331China The Key Laboratory of Well Stability and Fluid&Rock Mechanics in Oil and Gas Reservoir o f Shaanxi Province Xi'an Shiyou UniversityXi'an 710065China Chongqing Key Laboratory of Energy Engineering Mechanics&Disaster Prevention and Mitigation Chongqing University of Science and TechnologyChongqing 401331China Graduate Office Chongqing University of Science and TechnologyChongqing 401331China

The contact form of rock-concrete has a crucial influence on the failure characteristics of the stability of rock-concrete *** study the influence of contact surface on the mechanical properties of rock-concrete composite specimens under compressive loads,the two different contact forms of rock-concrete composite specimens are designed,the mechanical properties of these two different specimens are analyzed under triaxial compressive condition,and analysis comparison on the stress-strain curves and failure forms of the two specimens is carried *** influence of contact surface constraint on the mechanical properties of rock-concrete composite specimens is *** show that the stress and strain of rock-concrete composite specimens with contact surface constraint are obviously higher than those ***,compared with composite specimens without the contact surface,the existence of contact surface constraint can increase the axial peak stress of composite specimens by 24%and the axial peak strain by 16%.According to the characteristics of the fracture surface,the theory of microcrack development is used to explain the contact surface constraint of rock-concrete composite specimens,which explains the difference of mechanical properties between the two rock-concrete composite specimens in the *** results cannot only enrich the research content of the mechanics of rock contact,but also can serve as a valuable reference for the understanding of the corresponding mechanics mechanism of other similar composite specimens.

关键词： rock-concrete composite specimen contact surface mechanical properties failure mechanism

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