“坡”、“场”因素对大型滑坡运动特征的影响
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摘要
以滑坡的最大水平距离(Lmax)和视摩擦因数(Hmax/Lmax)为评价指标,探讨"坡"(滑坡体积(V)、滑坡高度(H)、滑坡坡度(α))和"场"(坡脚约束角(θ)、场地条件(X))因素对大型地震滑坡和降雨滑坡运动的影响特征。研究结果表明:在滑坡最大水平距离(Lmax)的影响上,滑坡高度(H)是降雨滑坡的主要因素,影响因素大小的顺序为H,α,θ和X。而对于体积为106~107 m3的地震滑坡,场地条件的影响比降雨滑坡大,其影响因素从大到小的顺序依次为H,X,α和θ。当地震滑坡体积大于107 m3时,滑坡坡度(α)则是Lmax的主要因素,影响因素从大到小的顺序依次为α,H,θ和X。显著性分析结果表明,滑坡高度(H)是大型降雨滑坡和体积为106~107 m3的地震滑坡的最大水平距离Lmax的显著性影响因素。在滑坡的视摩擦因数(Hmax/Lmax)的影响上,滑坡坡度(α)是地震滑坡的主要因素,影响因素从大到小的顺序依次为α,H,X和θ。而对于降雨滑坡,体积为106~107 m3时影响因素从大到小的顺序依次为α,H,θ和X;体积大于107 m3时,则影响因素从大到小的顺序依次为H,α,X和θ。显著性分析结果表明,H,α,X是体积大于107 m3的地震滑坡Hmax/Lmax的显著性影响因素。
The maximum horizontal distance(Lmax) and apparent coefficient of friction(Hmax/Lmax) are considered as the evaluation criteria of landslide movement.In order to analyze the landslide movement,five influence factors of large-scale seismic and rainfall landslide are considered including landslide volume(V),landslide height(H),landslide slope gradient(α),constraint angle of slope toe(θ) and ground type(X).The results show that,at the landslide maximum horizontal distance(Lmax),the landslide height H is the most important factor of rainfall landslides;and it follows by slope gradient(α),constraint angle of slope toe(θ) and ground type(X) in turn.When the volume is from 106 to 107 m3,the influence of ground type(X) on the seismic landslide is larger than rainfall landslide;and the influence factors of seismic landslides are H,X,α,θ in sequence.When the volume is larger than 107 m3,the landslide slope gradient α is the most important factor of seismic landslide;and it follows by landslide height(H),constraint angle of slope toe(θ) and ground type(X) in turn.By significant analysis,the landslide height(H) is significant influence factor of Lmax of large-scale rainfall landslide and seismic landslide with the volume from 106 to 107 m3.At landslide apparent coefficient of friction(Hmax/Lmax),the landslide slope gradient(α) is the most important factor of seismic landslides,it follows by landslide height(H),ground type(X) and constraint angle of slope toe(θ) in turn.The influence factors of rainfall landslide with the volume from 106 to107 m3 and larger than 107 m3 are α,H,θ,X and H,α,X,θ respectively.The H,α,X are significant influence factors of Hmax/Lmax of seismic landslide with the volume larger than 107 m3 by significant analysis.
引文
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