Based on the analysis of thin sections by microscope , measurement of porosity and density , and geological setting , we tested the rock physical parameters of sandstone , siltstone , carbonate and other transitional sedimentary rocks by the mts system under formation conditions ( temperatures , pressures and pore fluid properties ) . the rocks we tested are from tertiary ( including zhujiang formation , zhuhai formation , enping formation , hanjiang formation ) of zhujiangkou basin in southern china sea . according to the analysis results , we studied the main ultrasonic wave velocity characters of rocks , which are compressive and shear wave velocity and poisson ' s ratio under different formation conditions
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The features of phase and group velocity were advanced by means of preparing samples with different shaping . the phenomenon of " cusp " in group surface of quasi - shear wave ( qsv ) was observed . the inversed velocity surface according to calculated elastic constants in real orthotropic media is consistent with practical measured velocity surface
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2 . studying the effects of soft layer and hard layer on seismic response . we further investigate the behavior of both the soft layers and the hard layers with the shear wave speed less than 500m / s effecting on the maximum acceleration and the shape of response spectrum , respectively
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This paper relates to some problems about the determination of design ground motion parameters , which include the choice of the attenuation relationship of rock horizontal acceleration response spectrum , the impact of focal depth to rock peak horizontal acceleration and rock response spectrum curves , the choice of intensity envelops function and random input phase , the choice of soil nonlinearity and shear wave velocity , scale of design ground motion response spectrum etc . in the researches of relative aspect , based on a typical section plane of the engineering site , influence of the change of some parameters on design ground motion parameters and the existing errors and corresponding rules are studied by using the method of one dimension model of equivalent linearization
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Adopting the deformation harmony theory , the numeric calculation of the curve of load versus settlement is made . the fitting results between the calculated curve of load - settlement and the measured one of piles with different construction process are illustrated . hence , under the condition of few or no static load test data , the performance of bearing capacity of single bored pile in loess may be predicted utilizing indexes of shear wave velocity , static cone penetration test and modification coefficient of depth , so it is remarkable to reduce the blindness of preliminary design of pile
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3 ) from the samples saturated completely by air to those saturated completely by brine , the velocities of compressive wave of the rocks increase obviously , with the extent of 11 . 73 % ; the velocities of shear wave change little or decrease slightly , with the average of decreasing extent of 1 . 21 % for shear wave 1 and 1 . 16 % for shear wave 2 . the difference of velocity between compressive wave and shear wave makes poisson ' s ratio increase obviously , with the average extent of 87 . 25 %
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Can influence directly the velocities of compressive wave and shear wave of rock . commonly , the higher the content of carbonate in rock , the higher the velocity of compressive wave and shear wave ; the higher the mud content , the lower the velocity of compressive wave and shear wave ; the higher the porosity of rock , the lower the velocity of compressive wave and shear wave ; the more compacted the rocks , the higher the velocity of compressive wave and shear wav
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Numerical results show that if appropriate delay times of sources are exerted on elements of phased array , direction of acoustic beam radiated from the phased array can be steered so that the refracted compressional wave and the refracted shear wave can be excited effectively
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5 ) the velocity of the compressive and shear wave for the samples saturated completely by brine increases with the increasing of confining pressure ( with the constant pore pressure ) , but poisson ' s ratio decreases . 6 ) some interior factors , such as the composition of rock , porosity , density and so on
