Abstract: The lateral pressure of caved ore-rock in metal mine has a significant effect on supporting the surrounding rock and controlling the rock mass movement. Taken the caved ore in Gongchangling Iron Mine as an example， the distribution law of the granular lateral pressure in the caved ore-rock with the limited width was studied. The experiment results show that the static lateral pressure was nonlinear increase with granular buried depth increase， the formula of granular pressure changed with buried depth and angle was obtained by regression based on the theory of dimensional harmonious principle. In the case of no backfill， the granular lateral pressure decreases with the increase of the discharge amount， the range of drawing increasing can accelerate the decreased speed of granular lateral pressure. The pressure values of the lower four measuring points decrease with the drawing amount， and the pressure values of the upper four measuring points increase. The break variable of lateral pressure at hanging wall is lower than the value at footwall， and the drawing amount has less influence on the lateral pressure of hanging wall. That is to say that the drawing amount has limited influence range on the granular lateral pressure in height and width under the condition of backfill. This achievement has guiding significance for revealing the pressure bearing mechanism and application in the mine engineering of granular.

Key words: caving, rock mass displacement, granular lateral pressure, Rankine earth pressure, classical Janssen theory