1 Rocks 1.1 Rock and its formation 1.2 Physical properties of rocks 1.3 Rock weathering 1.4 Scale effect of rocks New words and phrases 2 Rock Stresses 2.1 Stress state 2.2 Mohr's circle for stresses 2.3 Determination of in-situ stresses New words and phrases 3 Mechanical Properties of Rocks 3.1 Mechanical behavior of rocks 3.2 Standard mechanical tests on rocks 3.3 Rock failure criteria 3.4 Influencing factors of rock behavior New words and phrases 4 Rock Mass Classification 4.1 Introduction 4.2 Broken rock zone (BRZ) 4.3 Rock quality designation (RQD) 4.4 Rock mass rating (RMR) 4.5 Rock mass quality (Q) New words and phrases 5 Application of Rock Mechanics in Rock Tunnel Engineering 5.1 Introduction 5.2 Rock tunnel excavation 5.3 Rock tunnel stabilization New words and phrases References