是较陡斜坡上的岩土体在重力作用下突然脱离母体崩落、滚动，最终在坡脚堆积形成的结构松散、杂乱、无层理、多孔隙的石堆。Rock masses on the steep slope suddenly break away from the mother rock, fall or roll down to the toe of the slope and form the loose, disordered, non-bedded and interspaced pile of rocks.