Axial extensometer and circumferential strain gages were used to measure the axial and circumferential strains respectively. σ c σ ucs 0 88 0 222 d l where σ c is the corrected uniaxial compressive strength. A comparison study deep learning based classification of rock structure of tunnel face tunneling and deep excavations in spatially variable soil and rock masses slope failure incidents and other stability concerns in surface lignite mines in greece some challenges of deep mining.
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