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滚石坡面运动影响因素众多,分析预测困难,确定崩塌滚石危害范围,对崩塌灾害防治具有重要意义。在实测汶川地震399条崩塌滚石剖面基础上,通过统计分析研究了滚石运动特征和危害范围参数,得出如下结论:(1)滚石坡面运动可划分为启动阶段、运动阶段和堆积阶段;56o为启动区滚石自由坠落模式和滑动、滚动模式界限,堆积区最大角度为39.6o,26o以下区域为减速带。(2)滚石运动距离与高度的比值,随着地震烈度以及边坡岩石强度的增高而增大,并给出了统计公式。(3)滚石最大运动距离与坡高之间以及陡坡段坡度与滚石运动扩散角之间有较好的线性关系,根据堆积区在边坡高度上所占比例,划分了两种坡面形态,给出了两种坡面形态边坡陡坡段坡度与滚石运动扩散角之间的统计关系图,可作为崩塌滚石危害范围判定的参考。
There are many influencing factors on the movement of the roller stone, which makes it difficult to analyze and predict, determine the damage range of the rock and roll, and is of great significance to the prevention and control of the collapse disaster. On the basis of 399 collapsestones of Wenchuan earthquake, statistical analysis of the characteristics of rolling stones and the parameters of hazardous area results in the following conclusions: (1) Rolling slope movement can be divided into start-up phase, movement phase and accumulation phase; 56o For the start area rolling stone free fall mode and sliding, rolling mode boundaries, the maximum deposition angle of 39.6o, 26o below the area for the deceleration zone. (2) The ratio of the moving distance and the height of the rolling stone increases with the increase of the seismic intensity and the rock strength of the slope, and the statistical formula is given. (3) There is a good linear relationship between the maximum movement distance of rock and slope and between the steep slope and the spreading angle of the rolling stone. According to the proportion of the accumulation area in slope height, the two slope forms are divided, The statistical relationship between the gradient of steep slope and the spreading angle of the rolling stone is given, which can be used as a reference for judging the damage range of the collapse rock.