边坡滚石运动轨迹分析及坡形坡率设计

在闽东南地区,因花岗岩球状风化诱发的边坡滚石灾害问题十分突出,通过研究滚石运动轨迹来确定合理的坡形坡率是防范边坡滚石灾害的基本对策。对边坡坡率、平台宽度和坡面特征三个基本参数变化条件下典型边坡滚石运动轨迹进行定量计算和对比分析,得到了以下结论:1植被覆盖的土质坡面较光滑坚硬的岩质坡面具有明显的"消能"效应;2加宽平台及增加平台植被可有效阻碍滚石运动;3放缓坡率能延缓滚石启动变形,并能明显控制滚石运动距离;4宽平台结合上缓下陡的坡形坡率设计是控制滚石灾害的优选方案。

The Failure Modes and Stability Analysis of Complicated Rock Slopes

In the southeast Fujian Province, the rockfall induced by the spherical weathering of granite rock mass is one of the most prominent geo-hazards. One of the methods to minimize the rockfall hazard is to study the rockfall movement and to determine the optimized slope shape. This paper presents the rockfall trajectory study results of three basic variables： slope angles; width of relief platforms and slope shapes. The main conclusions are： compared with rock slopes, soil slopes with vegetation cover have an obvious ＂energy dissipation＂ effect; increase the width of the relief platform and install vegetation on the relief platform will effectively impede the movement of rockfall. Flatten the slope will delay the initiation of the rock rolling and will control the distance of the rock movement. A wide relief platform with a flat upper slope, a steep lower slope is the optimized configuration for the rockfall hazard control.