地震滑坡地形剖面线多重分形特征及其在稳定性判别中的应用

Multifractal of terrain profiles of seismic landslides and its application to stability assessment

"5.12"汶川地震诱发了大量的滑坡和不稳定斜坡体,这些滑坡和不稳定斜坡体的稳定性影响到灾区社会经济发展和灾后重建。地震滑坡的不同稳定性状态孕育了滑坡地形剖面线的演化特征,并且地震滑坡地形剖面线直接地反映了在地震力作用下坡体的演变过程和演化机制。根据实测的汶川地震诱发的滑坡地形剖面线特征,研究了相对稳定滑坡、蠕滑阶段滑坡和不稳定斜坡的地形剖面线的分布特征,以及地震滑坡不同稳定状态下的地形剖面线的多重分形维数演化特征。研究结果表明相对稳定滑坡的多重分形维数演化特征的具有明显的有序性,处于蠕滑状态的滑坡和不稳定斜坡的多重分形维数演化出现明显的特征性拐点。

A mass of landslides and instable slopes was induced in '5.12' Wenchuan earthquake.The stability of the landslides and instable slopes would influence the development of society and economy and reconstruction in the affected area of the earthquake.The different stability states of the seismic landslides determine the different evolvement characteristics of the terrain profiles and the terrain profile traces directly reflect the evolvement process and mechanism of slopes in the seismic excitation.Based on the measured terrain profile traces of landslides induced by the Wenchuan earthquake,the distributive characters of terrain profile traces of the relative stable landslides and landslides in slow sliding and instable phases,and their multifractal dimension evolution characters were studied.Results show that the evolvement of multifractal dimensions of relative stable landslides has evident orders,and landslides in slow sliding and instable phases have obvious characteristic inflexions.