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The slope controlled by weak structural plane is prone to slip failure under the influence of blasting strong earthquake disturbance, and its failure mechanism is an important part of landslide disaster protection. Combined with the self-developed blasting stress wave disturbance shear strength instrument of structural plane, the deterioration law of shear strength was obtained, the quantitative relationship between dynamic stress of structural plane and shear strength after disturbance was constructed, and the failure model of internal shear strength of structural plane was proposed. The study shows that the transmission coefficient of P wave generated by the calculation model at the two interfaces decreases with the increase of incident angle. After loading, the shear strength of the weak structural plane was obviously deteriorated. When the loading amplitude was 0.2 mm, the cohesion decreased from 68.75 kPa to 9.69 kPa. Combined with the established shear strength failure model and the shear strength degradation law obtained from the test, the safety of the weak structural plane can be guaranteed when the amplitude is within 0.15 mm.
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