Chapter Four Blasting Engineering GeologyMain content:4.1Thebasicnatureoftherock4.4Geologicalconditioneffectonblasting4.2Stressshockwaveinrock4.5effectof geological conditiononBlasting4.3Classificationofrock4.6Blastinggeologicalprospecting(omission)2016/11/9ChapterFour Blasting Engineering Geology
2016/11/9 Chapter Four Blasting Engineering Geology 2 Main content: Chapter Four Blasting Engineering Geology 4.1 The basic nature of the rock 4.2 Stress shock wave in rock 4.3 Classification of rock 4.4 Geological condition effect on blasting 4.5 effect of geological condition on Blasting 4.6 Blasting geological prospecting （ omission）
Section OneBasicProperties.ofRockPdensitySBulkdensityYPhysicalpropertiesporousnessrockweatheringdegreewaveimpedanceCharacteristicimpedanceofrockistheproductofvelocityoflongitudinawave (C)anddensity ofrock Pintherock32016/11/9ChapterFour Blasting Engineering Geology
2016/11/9 Chapter Four Blasting Engineering Geology 3 Section One Basic Properties of Rock wave impedance porousness Bulk density rock weathering degree density s Characteristic impedance of rock is the product of velocity of longitudinal wave（C）and density of rock in the rock. s Physical properties
MechanicalPropertiesofRocksDeformationAElasticitycharacteristicsoftherock②PlasticMechanical③BrittlenessBpropertiesThe strengthcharacteristicsof the rockC@UniaxialCompressiveStrengthElastic modulus②UniaxialtensilestrengthDShearStrengthLPoisson'sratio2016/11/9Chapter FourBlasting Engineering Geology
2016/11/9 Chapter Four Blasting Engineering Geology 4 Mechanical Properties of Rocks 岩石风化程度 A Mechanical properties B D Deformation characteristics of the rock C The strength characteristics of the rock ① Uniaxial Compressive Strength ②Uniaxial tensile strength ③Shear Strength ①Elasticity ②Plastic ③Brittleness Elastic modulus Poisson’s ratio
SectionTwoStressWaveintheRockStresswaveRock intherapidlychanging loads,both produce movementand deformation.The particlewould losethe original balanceand produce deformation and displacement,form a disturbance.Thedisturbance of aparticleisbound to causedisturbanceoftheadjacentparticles.Thisdisturbance is called the wave propagation; At the same time, the deformation will cause thestressandstrainbetweenthe particle.The propagation ofthis changein stress,strain,is calledthestressorstrainwaveDeformation produced by impactface2016/11/9Chapter Four Blasting Engineering Geology
2016/11/9 Chapter Four Blasting Engineering Geology 5 Section Two Stress Wave in the Rock Stress wave Rock in the rapidly changing loads, both produce movement and deformation. The particle would lose the original balance and produce deformation and displacement, form a disturbance. The disturbance of a particle is bound to cause disturbance of the adjacent particles. This disturbance is called the wave propagation; At the same time, the deformation will cause the stress and strain between the particle .The propagation of this change in stress, strain, is called the stress or strain wave . Deformation produced by impact face
Types of WavewaveVolumewaveSpread insidethe mediathe propagationSpread along the boundaryposition of waveSurface waveofthe mediaMediumbodysurfaceparticlemakeshorizontalvibrationLove waveperpendiculartothewavepropagationdirectionParticle movesalongRayleigh waveThevibration directiontheelliptical trajectoryofmediumparticleWiththesamedirectionlongitudinal waveof wavepropagation.Withperpendiculartotransversewavethedirection ofdisturbances propagation2016/11/96ChapterFour Blasting Engineering Geology
2016/11/9 Chapter Four Blasting Engineering Geology 6 Love wave Rayleigh wave longitudinal wave transverse wave Types of Wave the propagation position of wave Volume wave Surface wave Spread inside the media Spread along the boundary of the media The vibration direction of medium particle wave With perpendicular to the direction of disturbances propagation With the same direction of wave propagation. Particle moves along the elliptical trajectory Medium body surface particle makes horizontal vibration perpendicular to the wave propagation direction