反倾层状岩质边坡倾倒变形时空演化特征研究

为研究反倾层状岩质边坡倾倒变形时空演化特征,以硝洞槽岸坡为研究实例,首先在工程地质资料调查分析基础上对岸坡进行倾倒变形空间分区分析,然后基于地表位移监测资料分析岸坡不同区域倾倒变形随时域变化特征,最后对地表离散位移监测点采用距离反权重插值法得出岸坡倾倒变形位移演化云图,综合分析岸坡倾倒变形时空演化特征。研究结果表明:(1)岸坡前部以水平变形为主,后部以垂直变形为主,岸坡整体变形受控于前部水平变形;(2)岸坡中部条带区域变形控制着岸坡整体变形演化过程,岸坡整体变形滞后于岸坡中部变形,中部条带状变形区位移的增加会诱发后期岸坡整体位移的增加,推断该带状区为倾倒变形锁骨段。

Spatio-temporal Evolution of Toppling Deformation of Anti-dip Bedded Rock Slope

The spatio-temporal evolution of toppling deformation of an anti-dip bedded rock slope was researched in this article.On the basis of engineering geological survey data,the toppling deformation of bank slope was partitioned into many zones,and then the temporal variations of toppling deformation in different zones were analyzed based on surface displacement monitoring data.Furthermore,inverse distance weighting (IDW) interpolation method was employed to obtain the contours of toppling deformation.Results suggest that 1) the front part of the bank slope is dominated by horizontal deformation and the back part by vertical deformation;the global deformation of slope is controlled by the front part' s deformation;2) the belt-like deformation area in the middle of bank slope determines the evolution of global deformation of bank slope,which correspondingly lags behind the deformation in central area.Moreover,the increase in the displacement of central belt-like deformation area would induce the increase in the total displacement of the rear.The belt-like area is considered as collarbone section of the toppling deformation.