Which rock property primarily affects the stability of a tunnel face?

What does UCS stand for in rock mechanics?

A. Ultimate Compression Shear

B. Uniaxial Compressive Strength

C. Uniform Core Strength

D. Unconfined Compression Standard

Which test is commonly used to determine tensile strength of rock?

A. Point load test

B. Slake durability test

C. Brazilian test

D. UCS test

Rock mass rating (RMR) system is used for:

A. Water quality classification

B. Rock load estimation

C. Soil permeability analysis

D. Slope stability in soils

What does the term �anisotropy� in rock mechanics refer to?

A. Isolated fractures

B. Uniform grain structure

C. Direction-dependent properties

D. Complete randomness