Rock mass and intact rock
WebRock material is the term used to describe the intact rock between discontinuities; it might be represented by a hand specimen or piece of drill core examined in the laboratory. The rock mass is the total in-situ medium containing bedding planes, faults, joints, folds and other structural features. Web21 Jun 2024 · The modelled strength of the intact granite is 360 MPa at a depth of 1400 m and increases to 455 MPa at 2200 m (using our estimate for the empirical m i term of 30, …
Rock mass and intact rock
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Web16 Feb 2024 · For the intact rock, the peak strength is 94.3 MPa and the peak strain is 0.0112, while for the jointed rock mass, the peak strength is reduced to 85.2 MPa and the … WebFractured rock mass: The shear strength of a fractured rock mass, in which the rupture surface partially lies on fracture surfaces and partially passes through intact rock, can be expressed as a curved envelope (Figure 14-2). At low normal stresses where there is little confinement of the fractured rock and the indi-
Web12 Apr 2024 · Almost all conventional discrete fracture network (DFN) models embedded within rock masses are discontinuities with zero tensile strength and mean values of geomechanical parameters. However, the spatial variability and networks of weak and strong potential failure planes and discontinuities have a significant effect on rock mass … Web5 Mar 2024 · 2.1 Rock Specimen Configuration. Arzúa et al. and Alejano et al. carried out extensive uniaxial and triaxial compression tests on intact rocks and jointed rock masses to investigate the strength and deformation responses of jointed granitic rock specimens with two joint sets.The tested rock is bright, white-colored and coarse-grained granite
WebIt has been established that rock fails in compression by shearing along a ‘failure’ plane oriented at an angle . θ. with respect to . σ. 1. that is specific for a particular rock. • The M-C linear strength criterion implies that . θ. stays the same regardless of the confining pressure applied. Rock cylinder. σ. 1,p. σ. 2= σ. 3. 0 ... Webrock mass as: a sc =sci.s (2) Consider an example in which a rock mass is defined by the following parameters: Uniaxial compressive strength of intact rock sci = 100 MPa Geological Strength Index GSI = 40 Constant mi = 10 Using the program RocLab1, the uniaxial compressive strength of the rock mass is
Web15 Jun 2024 · Rock mass refers to any in situ rock with all inherent geomechanical discontinuities. Rock Material or Intact Rock. The consolidated aggregate of mineral …
WebRock Mass Properties - Rocscience monachon pharmacieWeb10 Nov 2024 · The stability of underground excavations is influenced by discontinuities interspaced in surrounding rock masses as well as the stress condition. In this work, a numerical study was undertaken on the failure behavior around a circular opening in a rock mass having non-persistent open joints using PFC software package. A parallel-bond … monachium robert harrisWeb9 Sep 2024 · where UCS is the compressive strength of rock blocks (MPa) and K v is the rock mass intactness index. The BQ system is described in GB/T 50218-2014, 2014. Rock quality designation (RQD) Rock quality designation (RQD) was developed to provide a quantitative estimate of rock mass quality from drill core logs (Deere 1963, 1989; Deere et … ian poffWebAlthough intact rock is considered to be a continuum, its behaviour is often heterogeneous and anisotropic related to its fabric and mineral micro-structure. In mechanical terms, it is characterized by its specific weight, strength and deformability. Diagram showing the transition from intact rock to heavily jointed rock mass with increasing ... ian ponomorenko twittermonachon ollonWeb13 Apr 2024 · The engineering properties of the intact rock are listed in Table 2. The uniaxial compressive strength of rock is 87 MPa. On Deere–Miller classification chart, the intact rock is classified as CM, i.e. rock having medium strength and medium modulus ratio. The photographs of some failed specimens are presented in Fig. 2. Specimens of ... monachium airport hotelRock mass is a matrix consisting of rock material and rock discontinuities. Its characterization and classification aim to determine the rock mass characteristics by assigning values to a set of rock parameters. The behavior of intact rock material can be determined by continuum mechanics but rock masses are … See more To derive the overall behavior of a rock mass, both the engineering properties of the rock material and the fractures should be taken into … See more Most of the multi-parameter rock mass classification systems were developed from civil engineering case histories. Those that are … See more ian poiner aims