苏宝河流域地震滑坡运动特征研究

Study on motion characteristics of seismic landslides in Subao River Basin

以苏宝河流域地震滑坡统计数据为基础,运用数理统计知识,以滑坡最大水平运动距离(Lmax)和视摩擦因数(Hmax/Lmax)为评价指标,探讨影响因子(滑坡面积S、滑坡高度H、滑坡坡度α、运动区坡度β、场地类型X)对不同规模的地震滑坡运动的影响特征。在Lmax的影响上,当S>1 000 m2时,影响因子的大小顺序为H,α,β和X;当S≤10 000 m2时,影响因子的大小顺序为H、X、α和β。显著性分析表明,H是影响Lmax的决定性因素且不受滑坡规模大小的限制。在Hmax/Lmax的影响上,当S>10 000 m2时,影响因子的大小顺序为α,H,β和X;当S≤10 000 m2时,影响因子的大小顺序为H,α,β和X;显著性分析表明,当S≤10 000 m2时,H、α、β对H max/L max的影响特别显著;当S>10 000 m2时,各影响因子对H max/L max均无显著影响。

Based on the statistic data of seismic landslides in Subao River basin and with the maximum horizontal displacement （ Lmax） and the apparent friction coefficient （ Hmax/Lmax ） as the evaluation indexes, mathematical statistic methods were used to discuss the impact on various seismic landslide movement by four influential factors including landslide height （ H ）, landslide slope （ α ）, motion area slope （ β ） and site type （ X ）. In terms of the impact on L when the landslide area is over 1000 m2 , the order of influence from high to low is： H,α,β, X ; when the landslide area is smaller than 1000 m2 , the order of influ- ence is： H,α,β. The significance analysis shows that H is the decisive factor influencing Lmax and not constrained by the area of landslide. In terms of the impact on Hmax/Lmax, when the landslide area is over 1000 m2 , the order of influence from high to low is： H,α,β, X ; when the landslide area is smaller than 1000 m2 , the order of influence is： H,α,β, X. The significance a- nalysis shows that H,α,β have significant impact on Hmax/Lmax, when the landslide area is smaller than 1000 m2; the four influen- tial factors do not have significant impact on Hmax/Lmax, when the landslide area is over 1000 m2.