摘要
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。
Movement of collapsed stones on the slopes is affected by many factors, therefore, its analysis and prediction is very difficult. Determining the damage range of collapsed stones is very important to the prevention of collapse disaster. Based on site measurement and statistical analysis of 399 sections of collapse induced by the Wenchuan earthquake, the movement characteristics and hazard range parameters of collapsed stones on slopes are studied. The main conclusions are drawn as follows. （1） Movement of collapsed stones on slopes can be divided into three stages, that is, initiating stage, movement stage and depositing stage. The limit between free falling and sliding-rolling model in initiating stage is 56o;the maximum slope angle of deposition zone is 39.6o;and the slope angle of deceleration zone is below 26o. （2） Ratio between moving distance and the height of slope, increases with the increase of earthquake intensity and rock strength;and a statistical formula is given. （3） We get good linear relationship between the maximum moving distance and height slope, as well as between slope angle in the steep sections and spread angle. According to the proportion of deposition area in the whole slope, the slope shape is divided into two kinds;and the statistical diagram of the relationship between the maximum moving distance and spread angle is given which may be useful for determining the damage scope of collapsed stones.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2014年第3期772-776,共5页
Rock and Soil Mechanics
基金
交通运输部西部交通建设科技项目(No.2009318000095
No.2013318800020)
关键词
汶川地震
崩塌
滚石坡面运动
扩散角
Wenchuan earthquake
collapse
slope movement of collapsed stones
spread angle
