地貌类型对边坡倾倒变形的贡献率影响

Influence of Geomorphic Types on the Contribution Rate of Slope Toppling Deformation

准确分析影响边坡倾倒变形的各因素贡献率,对于防控滑坡灾害意义重大。通过对收集的32处实际倾倒变形样本案例分析,将所处不同地貌类型的边坡倾倒变形数量、面积、体积及厚度等因素贡献率定量化并计算综合贡献率,为不同地貌类型下的边坡灾害防治提供辅助决策参考。研究表明:32处实际边坡样本所处地貌类型主要有丘陵、盆地、山地、高原和平原。从不同地貌的边坡倾倒变形数量贡献率来看,山地边坡数量最多,平原边坡数量最少;从不同地貌的边坡倾倒变形面积、体积贡献率来看,高原边坡面积贡献率最大,平原面积贡献率最小;从不同地貌的边坡倾倒变形厚度贡献率来看,高原边坡厚度贡献率最大,盆地边坡厚度贡献率最小。从4个要素综合贡献率分析,得出高原与山地的边坡对其倾倒变形的贡献率最高,数量约占总体的69%;地貌类型为平原的边坡对其倾倒变形贡献率最低,数量约占总体的3%。该研究为防止边坡灾害发生提供辅助决策支持。

Accurate analysis of the contribution rate of various factors affecting the slope collapse deformation is of great significance to prevent and control landslide disaster. Through the collection of 32 actual toppling deformation cases analysis, the contribution rate of the number, area, volume and thickness of slope dumping deformation of different geomorphic types was quantified, then the comprehensive contribution rate was obtained to provide an auxiliary decision-making reference for the disaster prevention and control of different geomorphic types slopes. The research shows that there are 5 types of landform in 32 actual slope samples: hill, basin, mountain, plateau and plain. In terms of the contribution rate of slope toppling deformation of different landforms, the number of mountain slope is the highest and the number of plain slope is the lowest. In terms of the toppling deformation area and volume contribution rate of the slope of different landforms, the contribution rate of the plateau slope area is the largest, and that of the plain area is the smallest. In terms of the thickness contribution rate of slope toppling deformation of different landforms, the thickness contribution rate of plateau slope is the largest, and that of basin slope is the smallest. From the analysis of the comprehensive contribution rate of the four factors, it is concluded that the slopes of plateau and mountainous have the highest contribution rate to toppling deformation, accounting for about 69% of the all toppling deformation. Plain slopes have the lowest contribution rate of toppling deformation, accounting for about 3% of the all toppling deformation. This study provides supplementary support to prevent the occurrence of slope hazards.