Discussion

Match the following site investigation in-situ test on the rocks according to their characteristics :

Test	Characteristics
(a) Schmidt Hammer test	(1) It is carried out to assess deformation ability inside a borehole
(b) Point load test	(2) It is carried out to estimate the angle of friction of discontinuities or basic angle of friction for smooth discontinuities to allow calculation of the residue angle of friction and joints roughness coefficients
(c) Till test	(3) Measures the strength index of rock sample classification and for correlation with uniaxial compressive strength of the rock
(d) Pressuremeter test	(4) It is used to obtain an approximate estimation of uniaxial compressive strength of rocks

Answer: D

The correct match is a-4, b-3, c-2, d-1.

The Schmidt hammer gives a rebound value from which an approximate uniaxial compressive strength is estimated (a-4).
The point load test gives a strength index used to classify rock and to correlate with uniaxial compressive strength (b-3).
The tilt test (printed 'Till test') tilts a block until its upper part slides, giving the friction angle of a discontinuity and the basic friction angle used in calculating the residual friction angle and joint roughness coefficient (c-2).
The pressuremeter expands a probe against the walls of a borehole to measure the deformability of the rock (d-1).

Every other code mismatches at least two of these pairs.

No comment is present. Be the first to comment.

Loading…