Structural plane is one of the key factors controlling the local stability of rock mass engineering.It is a prerequisite for rock mass stability analysis to find out the occurrence and combination of structural planes.Geolog-ical survey is often used at present.However,a high-cost supplementary survey is often needed when there are omis-sions due to the limitation of this survey means.Therefore,the surface vibration response law of the structural plane model was studied by laboratory tests.The study shows that the amplitude of the particle in front of the structural plane increases for the single structural plane model.For a block model cut by two structural planes,the amplitude-amplification effect exists only in front of the structural plane far from the power input side.Furthermore,the rock mass models with different structural plane dip angles were simulated respectively.The results show that,when the angle θ between the structural plane and the ground in the direction of the explosion source is less than 90°,the par-ticle amplitude in the incident area of the vibration wave in front of the structural plane has an obvious amplification effect,and the particle amplitude behind the structural plane significantly attenuates.With the decrease of the angle θbetween the structural plane and the boundary plane,the increase rate of the peak vibration velocity of the particle in front of the structural plane gradually increases,and the amplitude of the wave amplifies 2.8 times when θ=20°.
关键词
节理岩体/岩石块体/临空面/振动响应/衰减特性
Key words
joint rock mass/rock block/free face/vibration response/attenuation characteristics
维普
万方数据