WORKER WAS STANDING ON LEVEL SURFACE PULLING ON ROPE TO COVER LOAD WITH TARP. THE ROPE/TARP CONNECTION BROKE AND WORKER FELL BACKWARDS, LANDING ON HIS BACK AND STRIKING HIS HEAD ON GRAVEL, RES ULTING IN SEVERAL SMALL CUTS TO HEAD AND ONE ON ELBOW. WORKER LATER COMPLAINED OF DIZZINESS AND DR. DIAGNOSED BLOOD CLOT AT BACK OF BRAIN.