Experimental Research on the Influence of Obliquity on the Mechanical Characteristics of a Fractured Rock Mass

Rock mass fracture data was collected from cement specimens to help solve engineering problems related to the digging and support of fractured rock masses.The specimens were made from cement and are intended to simulate rock masses that have different obliquities in cross-sectional fracture.The specimens were loaded with a static load or with a dynamic load using an electro-hydraulic servo test machine or a split Hopkinson pressure bar.The influence of obliquity on the mechanical characteristics of the fractured rock mass was analyzed.The results are that the fractured rock mass shows the characteristics of brittle failure.The strength is sensitive to the strain rate: the strength increase with an increase in the strain rate.There is difference between the static and dynamic fracture of the rock mass related to obliquity.The lowest and the highest compression strength of the fractured rock mass under static loads occurred when the obliquity was 45° and 0° or 90°.Under dynamic loads the lowest and highest strengths occurred at 30° and 90°.