高烈度地震区岩土体边坡崩塌动力学特性研究

Research on Dynamical Characteristics of Collapse of Rock and Soil Slope in High Seismic Intensity Areas

摘要:

"5·12"汶川特大地震引发的次生山地灾害中以山体崩塌数量最多。本文在对国道213线都江堰至映秀段以及水磨支线公路边坡地震崩塌调查研究的基础上,分析总结了岩土体边坡的崩塌成灾模式、崩塌作用机理以及崩塌自组织临界(SOC)动力学特性。调查范围包括Ⅸ～Ⅺ度地震区,工点105个。对崩塌体方量、崩塌深度进行统计分析后发现,在Ⅸ度区崩塌体方量和崩塌深度都符合负幂律分布,呈现出明显的自组织临界动力学特性;而Ⅹ、Ⅺ度地震区不呈现该崩塌特性,其崩塌动力学性质受地震的强扰作用控制。

Abstract:

Among the secondary mountain disasters triggered by the ＂5·12＂ Wenchuan great earthquake,most were collapses of rock and soil slope.Based on the field investigation along State Road G213 from Dujiangyan to Yingxiu and its Shuimo branch road,the collapse disaster mode,failure mechanism and self-organized criticality（SOC） dynamical characteristics of rock and soil slope are analyzed and summarized in detail.The investigation area covers Ⅸ,Ⅹ,Ⅺ seismic intensity zones,and collapse site numbers are 105.By statistical analyzing the volume and depth of the collapses,it is found that in Ⅸ zone volumes and depths of collapses obey negative power law distribution,display self-organized criticality（SOC） dynamical characteristics,but in Ⅹ,Ⅺ zones the collapse dynamical characteristics does not show self-organized criticality,it is controlled by earthquake intensity.