Question: 2.1. A rock mass is transacted by 3 intersecting joint sets. J1 has 30cm joint mean spacing, is continuous, with moderately rough unweathered surfaces, no

2.1. A rock mass is transacted by 3 intersecting joint sets. J1 has 30cm joint mean spacing, is continuous, with moderately rough unweathered

2.1. A rock mass is transacted by 3 intersecting joint sets. J1 has 30cm joint mean spacing, is continuous, with moderately rough unweathered surfaces, no infill and is dry. J2 has a spacing of 20cm, is planar and discontinuous, with signs of water and is moderately rough with some iron staining. J3 is undulating and continuous, spaced 20-30 cm apart, relatively smooth, no infill and dry, but with iron staining. Intact rock uniaxial compressive strength is 80MPa, and overburden density is 2720kg/m3. March 2023 2.1.2. Calculate number of joints per unit volume of the rock mass (2) 2.1.3. Estimate the RQD of the rock mass. 2.1.4. List the six variables in Barton's Q. Determine their values and calculate the Q rating of the rock mass using the attached tables ANNEXTURE A

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