Rock debris is used in reclaimed land of quay wall for liquefaction countermeasure, because it is a highly permeable material. However, rock debris ground has the potential for settlement by cyclic shearing due to earthquake motions because it is reclaimed in water and loosely deposited. In the present study, in order to clarify such dynamic characteristics of rock debris, a comprehensive set of large simple shear tests and large triaxial tests ware carried out with various rock debris. As a result, it was found that the volume contraction characteristics of rock debris subjected to cyclic shearing depends on its density, confining stress, and cyclic shear stress ratio applied. Indeed, the residual volumetric strain developed markedly, when the confining stress was higher, and the relative density was lower, and the cyclic shear stress ratio was higher. In addition, we confirmed the wet density and void state of the rock debris ground when it was deposited in water by direct pouring. On the basis of the test results and their analysis, we presented a chart which can be used for assessment and prediction of the residual volumetric strain and settlement of rock debris ground under future earthquakes.