Effects of Differences in Mechanical Parameters of Media on Mechanical Properties and Failure Form of Composite Samples

다국어 초록 (Multilingual Abstract)

The deformation and failure of composite rock masses at the contact zone can cause serious safety hazards in underground engineering. Therefore, uniaxial compression experiment and numerical studies of composite samples were conducted. Combined with theoretical analysis, the effects of differences in the mechanical properties of two media on the mechanical properties and failure form of composite samples were investigated. The results show that the difference in mechanical properties of two media weakened the strength and elastic modulus of the composite sample and resulted in complex failure form of the sample. Additionally, the peaks of the AE frequencies of the two media occurred successively after the peak stress of the sample. At the macrolevel, the two media failed successively. These effects are more pronounced as the degree of difference in the mechanical properties of the two media increased. The difference in mechanical properties of the two media resulted in uncoordinated deformation and constrained stress near the contact interface, and the difference in Poisson's ratio is the main factor. The influence (enhanced or weakened) of uncoordinated deformation on the mechanical properties of the composite sample is affected by differences in the elastic modulus and Poisson's ratios of the two media.

참고문헌 (Reference)

1 Zhu C, "V shaped gully method for controlling rockfall on high-steep slopes in China" 78 (78): 2731-2747, 2019

2 Douma LANR, "The mechanical contrast between layers controls fracture containment in layered rocks" 127 : 1-11, 2019

3 Huang BX, "The effect of loading rate on the behavior of samples composed of coal and rock" 61 : 23-30, 2013

4 Wang AM, "Study of interaction between creep deformation of bedded salt rock" 31 (31): 3964-3970, 2010

5 Blenkinsop TG, "Structural controls on gold mineralizationon the margin of the Yilgarn craton, albanye fraser orogen : The tropicana deposit, Western Australia" 67 : 189-204, 2014

6 Yassaghi A, "Squeezing rock conditions at an igneous contact zone in the Taloun tunnels, Tehran-Shomal freeway, Iran : A case study" 42 (42): 95-108, 2005

7 Ajalloeian R, "Prediction of rock mass squeezing of T4 tunnel in Iran" 35 (35): 747-763, 2017

8 Xiao LL, "Precambrian metamorphic evolution and its tectonic implications of the Zuoquan metamorphic complex" 30 (30): 2925-2940, 2014

9 Dubinya NV, "On stress distribution in layered rock masses" 54 (54): 904-913, 2018

10 Mirenkov VE, "On probable failure of an undercut rock mass" 45 (45): 105-111, 2009

11 Wang AM, "Numerical experiment study of deformation and mechanical properties of layered salt rock" 30 (30): 2173-2178, 2009

12 Zhao JS, "Microseismicity monitoringand failure mechanism analysis of rock masses with weak interlayer zone in underground intersecting chambers : A case study from the Baihetan Hydropower Station, China" 245 : 44-60, 2018

13 Mu K, "Mesoscopicsimulation of relationship of acoustic emission and compressive deformation behaviour in sandstone under confining pressures effect" 33 (33): 2786-2793, 2014

14 Huang CC, "Mechanical behaviors of the brittle rock-like specimens with multi-nonpersistent joints under uniaxial compression" 220 : 426-443, 2019

15 Fairhurst CE, "International society for rock mechanics commission on testing methods : Draft ISRM suggested method for the complete stress-strain curve for intact rock in uniaxial compression" 36 : 279-289, 1999

16 Huang WP, "In situ identification of water-permeable fractured zone in overlying composite strata" 105 : 85-97, 2018

17 Zhao ZH, "Failure characteristics of three-body model composed of rock and coal with different strength and stiffness" 24 (24): 1538-1546, 2014

18 Zuo JP, "Failure behavior of a rock-coal-rock combined body with a weak coal interlayer" 23 (23): 907-912, 2013

19 Zuo JP, "Failure behavior and strength characteristics of coal-rock combined body under different confining pressures" 41 (41): 2706-2713, 2016

20 Cong Y, "Experimental study on microscopic parameters of brittle materials based on particle flow theory" 37 (37): 1031-1040, 2015

21 Amann F, "Experimental study of the brittle behavior of clay shale in rapid unconfined compression" 44 (44): 415-430, 2011

22 Liang W, "Experimental investigation of mechanical properties of bedded salt rock" 44 (44): 400-411, 2007

23 Li YP, "Experimental investigation of mechanical behavior of bedded rock salt containing inclined interlayer" 69 : 39-49, 2014

24 Sheng JL, "Evaluation of van Genuchten-Mualem model on the relative permeability for unsaturated flow in aperture-based fractures" 576 : 315-324, 2019

25 Feng G, "Effects of supercritical CO2 adsorption on the mechanical characteristics and failure mechanisms of shale" 173 : 870-882, 2019

26 Liu J, "Effect of rock strength on failure mode and mechanical behavior of composite samples" 8 (8): 4527-4539, 2015

27 Krasnovskii AA, "Determination of boundary conditions in rocks under compression" 45 (45): 315-325, 2009

28 Chen YL, "Deformation failure characteristics of coal–rock combined body under uniaxial compression : Experimental and numerical investigations" 78 (78): 3449-3464, 2018

29 Feng WK, "Deformation analysis of a soft-hard rock contact zone surrounding a tunnel" 32 : 190-197, 2012

30 Khazaei C, "Damage quantification of intact rocks using acoustic emission energies recorded during uniaxialcompression test and discrete element modeling" 67 : 94-102, 2015

31 Hu B, "Cyclic loading–unloading creep behavior of composite layered specimens" 67 (67): 449-464, 2019

32 Mirenkov VE, "Contact problems in rock mechanics" 43 (43): 370-381, 2007

33 Liangxiao Xiong, "Biaxial Compression Creep Test on Green-schist Considering the Effects of Water Content and Anisotropy" 대한토목학회 18 (18): 103-112, 2014

34 Zhang GH, "Alterationcharacteristics of granite contact zone and treatment measures for inrush hazards during tunnel construction-A case study" 235 : 64-80, 2018

35 Cawood AJ, "3D mechanical stratigraphy of a deformed multi-layer : Linking sedimentary architecture and strain partitioning" 106 : 54-69, 2018