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Frontiers of Structural and Civil Engineering

Front. Struct. Civ. Eng.    2020, Vol. 14 Issue (2) : 322-330     https://doi.org/10.1007/s11709-019-0594-7
RESEARCH ARTICLE
Research on the influence of contact surface constraint on mechanical properties of rock-concrete composite specimens under compressive loads
Baoyun ZHAO1,2,3(), Yang LIU1,3, Dongyan LIU1,3, Wei HUANG1,3, Xiaoping WANG1,3, Guibao YU1,4, Shu LIU1,4
1. School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China
2. The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province, Xi’an Shiyou University, Xi’an 710065, China
3. Chongqing Key Laboratory of Energy Engineering Mechanics & Disaster Prevention and Mitigation, Chongqing University of Science and Technology, Chongqing 401331, China
4. Graduate Office, Chongqing University of Science and Technology, Chongqing 401331, China
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Abstract

The contact form of rock-concrete has a crucial influence on the failure characteristics of the stability of rock-concrete engineering. To 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 out. The influence of contact surface constraint on the mechanical properties of rock-concrete composite specimens is obtained. Results show that the stress and strain of rock-concrete composite specimens with contact surface constraint are obviously higher than those without. Averagely, 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 experiment. Research 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.

Keywords rock-concrete      composite specimen      contact surface      mechanical properties      failure mechanism     
Corresponding Authors: Baoyun ZHAO   
Just Accepted Date: 30 December 2019   Online First Date: 13 March 2020    Issue Date: 08 May 2020
 Cite this article:   
Baoyun ZHAO,Yang LIU,Dongyan LIU, et al. Research on the influence of contact surface constraint on mechanical properties of rock-concrete composite specimens under compressive loads[J]. Front. Struct. Civ. Eng., 2020, 14(2): 322-330.
 URL:  
http://journal.hep.com.cn/fsce/EN/10.1007/s11709-019-0594-7
http://journal.hep.com.cn/fsce/EN/Y2020/V14/I2/322
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Baoyun ZHAO
Yang LIU
Dongyan LIU
Wei HUANG
Xiaoping WANG
Guibao YU
Shu LIU
Fig.1  Rock-concrete composite specimens without (left) and with (right) contact surface constraint.
Fig.2  Triaxial experimental machine.
Fig.3  Installation of lateral and axial extensometer of rock-concrete composite specimens.
Fig.4  Schematic diagram of experimental loading of rock-concrete composite specimens.
specimen types σ3(MPa) diameter (mm) height (mm) density (kg/m3) σ1(MPa) ε1(%) ε3(%) wave velocity (km/s)
composite
specimen A
A0 49.88 99.35 2356 21.44 0.78 0.36 0.153
A7 49.93 99.97 2425 65.84 0.8 0.45 0.165
A15 50.04 100.02 2347 90.59 1.06 0.68 0.154
A22 49.82 100.15 2341 95.00 1.01 1.32 0.178
composite
specimen B
B0 49.70 99.77 2412 30.56 0.59 1.18 2.083
B7 50.14 99.65 2431 65.98 0.82 1.00 2.027
B15 50.19 99.76 2398 94.07 1.06 0.94 2.049
B22 49.61 100.14 2486 115.54 1.49 0.84 2.068
Tab.1  Basic  mechanical parameters of two rock-concrete composite specimens.
Fig.5  Triaxial compression stress-strain curves of rock-concrete composite specimens (a) with and (b) without contact surface constraint, respectively.
Fig.6  (a) The axial peak strain curves and their fitting curves of two rock-concrete composite specimens; (b) lateral peak strain curves and their fitting curves of two rock-concrete composite specimens.
Fig.7  Relationship between peak stress and confining pressure of two different rock-concrete composite specimens.
Fig.8  (a) The failure mode of rock-concrete composite specimen with contact surface constraint; (b) the failure mode of rock-concrete composite specimen without contact surface constraint.
Fig.9  Development mode of microcracks inside rock specimens.
Fig.10  Schematic diagram of microcrack development of rock-concrete composite specimens with contact surface constraints.
Fig.11  Schematic diagram of microcrack development of rock-concrete composite specimens with contact surface constraints.
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