中文摘要：

采用室内模型试验,研究了无黏性土堆积体在无侧限条件下沿斜面的滑动和堆积运动过程。探索了堆积体体积、粒径、形状,坡高,启动区坡度,坡脚约束角,滑面摩擦系数等指标对滑坡运动最终堆积参数（冲程,宽度,厚度,面积）的影响。试验结果表明：随着堆积体体积、颗粒粒径、坡高、启动区坡度、坡脚约束角变大和滑面摩擦系数减小,滑坡的最终堆积范围均会变大。无黏性土在斜面上的横向扩展运动有两种形式：一种是保持一定角度下滑,直至到达坡底;另一种是横向扩展到一定宽度后,沿垂直于坡脚线的方向向下滑动。堆积体体积、滑面摩擦系数、颗粒形状、坡脚约束角对冲程和堆积面积的影响比较显著,而坡高和体积对堆积宽度的影响比较显著。试验研究成果为深入研究滑坡冲程及堆积形态提供了初步的依据。

英文摘要：

By using laboratory model tests, the unconstrained sliding and accumulation of gravel on an inclined board are studied. The influences of various parameters of volume, gravel size, shape of accumulation, height of slope, angle of initiation region, constraint angle of slope toe and friction coefficient of sliding surface on the characteristics of final accumulation（run-out, width, thickness, and area） are investigated. The results show that with the increase of volume of accumulation, grain size, height of slope, angle of initiation region and constrained angle of slope toe and the decrease of friction coefficient of sliding surface, the scope of the final accumulation is expanded. The lateral extension motion of gravel on the slope has two different mechanisms： sliding to the slope toe with a certain angle, and sliding downward along the direction perpendicular to the slope toe when the lateral extension reaches a certain width. It is confirmed that the volume of accumulation, friction coefficient of sliding surface, gravel shape and constrained angle of slope toe are the most significant factors to influence the run-out and accumulation area, and the height of slope and volume of accumulation have significant influences on the width. Finally, the test results may provide a preliminary basis for further studies on landslide run-out and accumulation characteristics.