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| | Abstract | | We have studied rock physics models for developing a new method to rationally estimate the uniaxial compressive strength(UCS) of rocks from seismic velocity. The shaly sand model as a bimodal mixture model of effective medium models is used in modeling. With mechanical properties of sandstone and shale, the modified Voigt-Reuss-Hill average(VRH model) is employed for modeling uniaxial compressive strength-porosity relationship, and the Hertz-Mindlin and Hashin-Shtrikman models as well as VRH model are employed for modeling the seismic velocity-porosity relationship. These two models are combined for modeling the UCS-seismic velocity relationship. This model is applied to UCS and ultrasonic velocity measurement data in the laboratory for various types of rocks sampled in dam sites in Japan for evaluating its applicability. This application proves that the proposed model can be utilized for estimating the uniaxial compressive strength of rocks from seismic velocity. |
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