This paper combines open porosity, P-wave velocity, Leeb hardness and micro-drilling resistance force to estimate USC for a wide range of carbonate sedimentary rock types with different petrographic characteristics. The estimation of UCS from a single non-destructive or minimally invasive technique (NDT) may result incomplete because each NDT is sensitive to different compositional and textural factors.
However, restrictions in sampling large volume of material, the need of very large set of results and onsite characterisation of UCS non-destructively are requirements in many scientific and engineering investigations. The research results can provide theoretical reference for stability analysis of surrounding rock in stope and tunnel.Uniaxial compressive strength (UCS) is the most used parameter to measure rock strength. This is because rock mass with multiple structural planes is relatively broken, the compression strength of rock mass is reduced. In the range of 25°-80°, with the increase of dip of structural plane, the compression strength curve of the rock mass shows a “U” shape, which decreases first and then increases, the change of numerical solution and theoretical solution is basically the same When dip of structural plane is fixed and the number of structural plane in the same group increases, the compression strength of rock mass decreases with the increase of the number of structural plane. The results show that for single structural plane rock mass, under the same axial pressure, when dip is in the range of 0°-25° and 80°-90°, the compression strength does not change with dip. Compression failure characteristic of layered rock mass under the condition of single structural plane and multiple structural planes are studied systematically, and numerical solution is compared with theoretical solution. The layered rock mass is regarded as discontinuous medium, and interface in FLAC3D is used to simulate layer.
Taking layered rock mass of coal series strata as the research object, numerical model of its uniaxial compression is established by FLAC3D software.
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