scholarly journals Research on Slope Stability Evaluation Based on Improved Set Pair Analysis Method: A Case of Tonglvshan Open-Pit Mine

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xiaojie Yang ◽  
Zhenli Hao ◽  
Gaotong Ma ◽  
Gan Li
Keyword(s):  
Slope Stability ◽  
Evaluation Method ◽  
Fuzzy Comprehensive Evaluation ◽  
Open Pit Mine ◽  
Evaluation Index ◽  
Open Pit ◽  
Set Pair Analysis ◽  
Stability Evaluation ◽  
Pair Analysis ◽  
Spa Model

In this paper, combined with fuzzy analytic hierarchy process (FAHP), information entropy theory, and set pair analysis (SPA) theory, an improved set pair analysis model (EFAHP-SPA) for open-pit mine slope stability evaluation based on entropy method and FAHP is proposed. Taking the east-side slope of Tonglvshan north open-pit mine in Daye as an example, the proposed method is verified. First, an open-pit mine slope stability evaluation index system with 14 indicators in 4 categories, namely the topography and geomorphology, geological structure, hydrogeology, and other factors, have been constructed. Second, the objective weight and subjective weight of each evaluation index are calculated by entropy and fuzzy analytic hierarchy process, and then the comprehensive weight of the evaluation index is estimated based on subjective weight and objective weight. Afterward, the single-index connection degree between the evaluation index and the evaluation standard of the secondary subsystem is evaluated considering the improved set pair analysis theory, and the comprehensive connection degree of the system is obtained by combining it with the comprehensive weight of each evaluation index. Finally, the confidence criterion is established to discern the risk grade of slope stability in the east-side slope of the north open pit in Daye Tonglvshan mine. Moreover, case studies and comparisons of the proposed model with fuzzy comprehensive evaluation method and Entropy-SPA model were performed to confirm the validity and reliability. The results show that the evaluation results of the proposed EFAHP-SPA model are consistent with the actual situation of open-pit mines and the evaluation results of entropy-SPA model and are somewhat different from those of fuzzy comprehensive evaluation method. It indicates that the proposed EFAHP-SPA evaluation model can objectively evaluate the slope stability of the open-pit mine.

Fuzzy Comprehensive Evaluation on the Projects Risk Based Set Pair Analysis

2012 ◽  
Vol 490-495 ◽  
pp. 1221-1225
Author(s):  
Gao Yang Li
Keyword(s):  
Risk Assessment ◽  
Risk Evaluation ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Qualitative Assessment ◽  
Set Pair Analysis ◽  
Pair Analysis ◽  
Spa Model

This paper builds projects risk evaluation index system, and makes the projects risk evaluation from a qualitative assessment to a quantitative evaluation; Then, Making use of the advantage about SPA and fuzzy comprehensive evaluation, index weights are made by the set pair analysis (SPA) model and projects risk of fuzzy comprehensive evaluation is built; Lastly, a case is used to show the combine of set pair analysis and fuzzy comprehensive evaluation for projects risk assessment feasible.

scholarly journals A Heuristic Projection Pursuit Method Based on a Connection Cloud Model and Set Pair Analysis for Evaluation of Slope Stability

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2016
Author(s):  
Mingwu Wang ◽  
Yan Wang ◽  
Fengqiang Shen ◽  
Juliang Jin
Keyword(s):  
Slope Stability ◽  
Evaluation Method ◽  
Cloud Model ◽  
Projection Pursuit ◽  
Convergence Speed ◽  
High Dimensional ◽  
Fruit Fly Optimization Algorithm ◽  
Set Pair Analysis ◽  
Multiple Uncertainties ◽  
Pair Analysis

Determining the projection direction vector (PDV) is essential to the projection pursuit evaluation method for high-dimensional problems under multiple uncertainties. Although the PP method using a cloud model can facilitate interpretation of the fuzziness and randomness of the PDV, it ignores the asymmetry of the PDV and the fact that indicators are actually distributed over finite intervals; it quickly falls into premature defects. Therefore, a novel PP evaluation method based on the connection cloud model (CCM) is discussed to remedy these drawbacks. In this approach, adaptive numerical characteristics of the CCM are adopted to represent the randomness and fuzziness of the candidate PDV and evaluation indicators. Meanwhile, to avoid complex computing and to accelerate the convergence speed of the optimization procedure, an improved fruit fly optimization algorithm (FOA) is set up to find the rational PDV. Alternatively, candidate PDVs are mutated based on the mechanism “pick the best of the best” using set pair analysis (SPA) and chaos theory. Furthermore, the applicability and reliability are discussed based on an illustrative example of slope stability evaluation and comparisons with the neural network method and the PP evaluation method based on the other FOAs and the genetic algorithm. Results indicate that the proposed method with simpler code and quicker convergence speed has good global ergodicity and local searching capabilities, and can better explore the structure of high-dimensional data with multiple uncertainties and asymmetry of the PDV relative to other methods.

scholarly journals Evaluation of the suitability of human settlements in Qingpu district, Shanghai

2021 ◽  
pp. 341-341
Author(s):  
Yu-Kun Luo ◽  
Xiao-Hua Yang
Keyword(s):  
Logistic Model ◽  
Evaluation Method ◽  
Evaluation Model ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Set Pair Analysis ◽  
Human Settlements ◽  
Dynamic Evaluation ◽  
Exploratory Stage ◽  
Pair Analysis

In recent decades, people's attention to human settlements has been increasing. However, the research on the evaluation method of the suitability of human settlements is still in the exploratory stage, and there is no universally accepted evaluation method worldwide. Considering the uncertainty in the evaluation index system, this paper combines the set pair analysis (SPA) theory and the Logistic model to construct a new evaluation model of the suitability of human settlements and applies the model to the dynamic evaluation of the suitability of human settlements in Qingpu district from 2007 to 2016. The evaluation results show that the overall suitability of human settlements in Qingpu district is on the rise. Based on the analysis of the evaluation results, this paper puts forward some opinions on the development plan of Qingpu District and verifies the validity of the constructed model.

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