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문제 정의
- , 2012). Analysis of these case studies and test data can further improve our understanding of the mechanical properties of fault rocks.
제안 방법
- In this study, in situ and laboratory test data obtained on fault rocks were collected and analyzed to identify the mechanical properties of fault rocks in South Korea. Individual tests were conducted during the design and construction stages of 33 tunnels that pass through fault zones.
- The cohesion and friction angles were calculated from direct shear tests, triaxial compression tests, and in situ borehole shear tests.
- The data includes measurements of unit weight (n = 111), cohesion (n = 106), friction angle (n = 98), modulus of deformation (n = 125), modulus of elasticity (n = 45), uniaxial compressive strength (n = 41), and Poisson’s ratio (n = 58) (Fig. 1b).
- The data used for these analyses include the unit weight, cohesion, the friction angle, the modulus of deformation, the modulus of elasticity, uniaxial compressive strength, and Poisson’s ratio.
- The mechanical properties used in this analysis were the unit weight, cohesion, friction angle, modulus of deformation, and Poisson’s ratio.
- The uniaxial compressive strength and Poisson’s ratio were calculated from uniaxial compression tests, point load tests, and pressuremeter tests.
- Figure 2 shows histograms of the ranges of individual mechanical properties. The unit weights (moist unit weights) were calculated from laboratory tests, in situ gamma-gamma responses, and S-PS logging. The unit weights vary from 17.
- The mechanical properties of RMR V rock masses may be used in cases where fault rocks are not recognized during the investigation and design stages. Therefore, in this study, the design geotechnical parameters applied to RMR V rock masses in 88 tunnels were compiled and analyzed along with the mechanical properties of the fault rocks. The mechanical properties used in this analysis were the unit weight, cohesion, friction angle, modulus of deformation, and Poisson’s ratio.
- Given that the components that constitute fault zones are diverse and range from gouge to rock, their mechanical properties vary. Therefore, the specimens used in the tests were divided into groups based on their components and mechanical properties. Figure 4 shows the mechanical properties according to the fault constituent components and rock types, and Table 1 lists the mean values of these mechanical properties.
대상 데이터
- In this study, in situ and laboratory test data obtained on fault rocks were collected and analyzed to identify the mechanical properties of fault rocks in South Korea. Individual tests were conducted during the design and construction stages of 33 tunnels that pass through fault zones. The data used for these analyses include the unit weight, cohesion, the friction angle, the modulus of deformation, the modulus of elasticity, uniaxial compressive strength, and Poisson’s ratio.
- The mechanical properties of fault rocks were investigated by compiling and analyzing data from 584 design and construction tests from 33 tunnels that pass through faults (Fig. 1a). The data includes measurements of unit weight (n = 111), cohesion (n = 106), friction angle (n = 98), modulus of deformation (n = 125), modulus of elasticity (n = 45), uniaxial compressive strength (n = 41), and Poisson’s ratio (n = 58) (Fig.
- 1b). The most data available was for shale and basement fault rocks consisting of six rock types, including schist, gneiss, phyllite, andesite, and granite (Fig. 1c). The fault rocks were classified into gouge, breccia, cataclasite, and damage zones according to their constituent components (Fig.
후속연구
- In addition, the stability and safety of construction work requires the mechanical properties of fault rocks to be constrained through reliable testing and analysis. The results of this study were obtained through analysis of test results conducted on many fault rocks in South Korea and design data, and can be used during future construction works.
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