Soft Rock Properties and Strata Control

摘要: Publisher Summary This chapter describes soft rock properties and strata control. Soil mechanics can be defined as the study of behavior granular material. Cohesive forces between grains are small or nonexistent, stability is dependent on friction, which develops neighboring grains. In hard mechanics, ground considered continuous boundaries openings designed within yield limits rock. Stress levels predicted by theories elasticity, methods finite element difference applicable. The associated with coal measures highly laminated, slippage along their bedding planes frequently occurs if bent en masse. stronger rocks have well-developed joint patterns, while softer readily exhibit flowage. Around openings, zones yielded often present. Moisture content affect strength, for example, strength a saturated sandstone specimen only half that fully dried some mudstones completely disintegrate soaked in water. compressive increases degree confinement.