Search Method for Irregular Sliding Surface of Rock Slope Based on GeoSMA-3D

doi:10.12068/j.issn.1005-3026.2024.08.012

Abstract

Abstract:

Given the uncertainty in the development characteristics of rock discontinuities， a method for searching for irregular sliding surfaces in rock slopes was proposed. Using the rock masses of rock discontinuities III and IV as research objects， and utilizing the block cutting and key block identification modules in the GeoSMA-3D （geotechnical structure and model analysis-3D） system， the sliding mass is set as a geometric polyhedron. The internal block combinations of the rock mass form the polyhedron， with the surface of the polyhedron representing the sliding surface. The analytic hierarchy process is introduced to establish semi?quantitative evaluation criteria for the sliding surface. Using the Xiaopanling slope as a case study， the criteria for determining the irregular sliding surface were integrated into the GeoSMA-3D system. The study identifies six key blocks and three combined sliding surfaces. The potential sliding surface has a safety factor of 1.046， and the geometric shape of the sliding surface aligns with the actual slope with a fitness of up to 95%. This validates the rationality of the proposed method for searching sliding surfaces in rock slopes.

Key words: rock slope, sliding surface, GeoSMA-3D, key block, analytic hierarchy process（AHP）

CLC Number:

TU 457

Shu-hong WANG, Zhong LI, Qin-kuan HOU, You-ming LI. Search Method for Irregular Sliding Surface of Rock Slope Based on GeoSMA-3D[J]. Journal of Northeastern University(Natural Science), 2024, 45(8): 1159-1166.

Figures/Tables 13

Fig. 1 Schematic diagram of natural rock slope and structural plane

Fig. 2 Schematic diagram of wedge landslide

Fig. 3 Schematic diagram of search in closed area of slope

Fig. 4 Flow chart of determining block weights

Fig. 5 Schematic diagram of AHP sliding surface area

Table 1 Scale system

量化标准	因子重要性比较
1	a_i 和a_j 同样重要
3	a_i 比a_j 稍微重要
5	a_i 比a_j 明显重要
7	a_i 比a_j 强烈重要
9	a_i 比a_j 极端重要
2，4，6，8	相邻标度的中值

Table 2 Contribution value of each region in Fig.5

区域	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ	Ⅵ	Ⅶ	Ⅷ	Ⅸ
贡献值	1	3	1	4	5	4	7	9	7

Table 3 Weight of blocks in each region

区域	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ	Ⅵ	Ⅶ	Ⅷ	Ⅸ
权重	0.024 5	0.073 6	0.024 5	0.098 1	0.122 6	0.098 1	0.171 9	0.214 9	0.171 9

Fig. 6 The site of Xiaopanling slope and trace map of screening structure planes[25]

Fig. 7 Area of key blocks and sliding masses of slopes

Fig. 8 3D model of sliding masses

Fig. 9 Safety factor and slider area distribution diagram of sliding mass

Table 4 Sliding surface information

坡面区域

滑动面编号

滑动面

面积/m²

ABFGH

ACEGH

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