Investigation of dynamic coupled behavior of rock materials under combined compression and shear loading

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (10) : 9-17.

XU Song-lin, ZHOU Li-jiang, HUANG Jun-yu, ZHANG Chao, HU Shi-sheng

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Abstract

Since rocks are with complex structures at the micro and meso scale, they exhibit obvious load-path dependency and strain rate effect. Employing the modified split Hopkinson Pressure Bar (SHPB)device, series of experiments are conducted in the present paper to investigate the mechanical behaviors of three rocks, e.g. granite, marble, and sandstone, under quasi-static and dynamic combined compression and shear loading with five oblique angles. The load-path dependency and strain rate effect of slopes of stress strain relationship curves at the quasi-linear loading stage and strength of rocks are analyzed in details. The results show that normal modulus modulus, shear modulus and failure strength of rocks exhibit obvious the strain rate effect and certain coupled compression-shear effect, which also known as path-load dependency; Among then, dependence of shear stress on normal modulus is stronger than that of normal stress on shear modulus. The Drucker-Prager(D-P) criterion and the modified D-P criterion, which considering the coupled compression and shear effect, are employed to fit the quasi-static and dynamic failure surfaces. The results show that inner cohesion of rock exhibit certain strain rate effect, but inner friction angle takes on little strain rate effect. Further discussion focus on the subsequent yield surfaces of marble and description of stress strain relationship of rocks under combined compression and shear loading. These investigations provide a powerful method to determine strength parameters of rock materials under dynamic loading, and it is helpful to use the combined compression and shear experiments to investigate quasi-static and dynamic behaviors of rocks under complicated stress states.

Key words

Impact dynamics / Split Hopkinson Pressure Bar (SHPB) / combined compression- shear loading / load-path dependency / rock material

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XU Song-lin, ZHOU Li-jiang, HUANG Jun-yu, ZHANG Chao, HU Shi-sheng. Investigation of dynamic coupled behavior of rock materials under combined compression and shear loading[J]. Journal of Vibration and Shock, 2016, 35(10): 9-17

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