Solution-Estimate of the point load strength index

Estimate of the point load strength index

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Reference no: EM13508531

1. Triaxial tests were carried out on 54-mm-diameter (NX core) intact rock specimens. The applied confining nressures and the principal stress differences at failure are summrised below.

Confining pressure (MPa)	0	5.0	10.0	15.0	20.0	25.0
Principal stress difference (MPa)	59.5	87.5	I 16.0	139.5	167.5	192.5

Plot σ₁, against σ₃ at failure and determine the uniaxial compressive strength and the friction angle of the intact rock.

2. The intact rock that follows the Mohr-Coulomb failure criterion has c = 15 MPa and Φ = 27°. Estimate the uniaxial compressive strength;, the uniaxial tensile strength σ, and the Brazilian indirect tensile strength σ'_t. Give an estimate of the point load strength index I_s₍₅₀₎ and suggest a realistic range for the Youngs modulus E.

Reference no: EM13508531

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Estimate of the point load strength index

Reference no: EM13508531

Reference no: EM13508531

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