Fuzzy comprehensive evaluation on multiple constraint factors of city underground space development and utilization

According to constraint elements more and more appearing in the comprehensive forms, and at present it only considers that single constraint element of city underground space development and utilization has been unable to reflect the actual situation. On the basis of the main characteristics of city underground space development and utilization, this paper aims to analyze various factors which may cause the consequence and the frequency of appearance, and to construct evaluation index system of city underground space development and utilization which is composed of 5 one-level indexes, 20 two-level indexes of evaluation index system of multiple constraint factors of city underground space development and utilization, and to use the analytic hierarchy process and fuzzy comprehensive evaluation method to analyze and evaluate the influence on city underground space development and utilization. Analysis of the example application shows that, it only considers single constraint element of city underground space development and utilization is not comprehensive, and not science, and it needs to consider the correlation between various constraint elements.

The aggregate gradation of asphalt mixture is one of the most important factors affecting the service life of asphalt pavement. In order to study the gradation of asphalt mixture with the best comprehensive performance, this study puts forward a new method of mineral aggregate gradation optimization based on the fuzzy analytic hierarchy process and comprehensive evaluation method, aiming at the multi-level and multi-index evaluation of the road performance of asphalt mixture. First, the orthogonal test design method is applied to design nine target gradations with coarse aggregate (>4.75 mm) and fine aggregate (<4.75 mm) of AC-20 (asphalt concrete) mixture serving as two factors and the upper, middle, and lower positions of the gradation curve as three levels, and then the road performance test research is carried out. Second, a comprehensive model for evaluation of road performance of mineral aggregate gradation is established. A fuzzy complementary judgment matrix is constructed, and the index weights of each level and the hierarchical total ranking weight are calculated. Then, the membership function is introduced into the comprehensive evaluation model for the road performance of mineral aggregate gradation, and the membership values of each index of asphalt mixture road performance are obtained. Finally, the fuzzy comprehensive evaluation method is used to find out the comprehensive evaluation value of the road performance of the nine graded asphalt mixtures, and the mineral aggregate gradation is optimized. The research results show that the 1# gradation of the asphalt mixture has the highest comprehensive road performance evaluation value, and the combination of the fuzzy hierarchical analysis process and comprehensive evaluation method can more objectively and comprehensively evaluate the comprehensive road performance of the asphalt mixture and provide a useful reference for the optimal selection of asphalt mixture mineral gradation.

Vegetation restoration in abandoned mines is crucial for ecosystem recovery and sustainable development. However, the assessment of restoration effectiveness and long-term sustainability through appropriate methods remains a significant challenge. This study aims to evaluate the vegetation restoration effectiveness of the Mianshan abandoned mine in Dongzhi County, China, three years after the completion of the restoration project, using the analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE) methods. Drone oblique photography and field survey transects were applied to determine vegetation growth and geological conditions across different habitats, including the base, terrace, and slope behind the terrace. An evaluation indicator system was developed to assess restoration effectiveness. Results indicated that the overall vegetation restoration was moderately effective, with vegetation coverage and recovery rate (restored-to-native vegetation coverage ratio) of 62.0% and 66.7%, respectively. The terrace habitat exhibited the highest, while the base and slope showed fair restoration effectiveness. Vegetation coverage was the highest on the terrace, but species diversity was the lowest. The base had lower coverage but greater species diversity, with more planted species and invasive species. The slope exhibited low coverage and species diversity, with poor growth of planted species. The terrace had more conservative species than the base and slope. Key factors influencing vegetation restoration effectiveness across habitats included topography (e.g., slope gradient), soil texture (clay or gravelly soil), soil moisture, species selection, and planting strategies. This study evaluated vegetation restoration effectiveness in the Mianshan mine using AHP and FCE methods, highlighting the influence of topography, soil conditions, and species selection on restoration outcomes across diverse habitats.

With international practice and needs of business own development, it' s has become more and more common to carry out EPC project general contract in enterprises' contract. The EPC model covers basically the entire project construction process and comparing with the traditional contract model, the risk of general contactor is the biggest undoubtedly. To the ambiguity and uncertainty of risk assessment information, this paper presents the fuzzy comprehensive risk evaluation method for EPC general contractor risk assessment. Through the analysis of the EPC model to determine the risk source and loss of general contractor and then use the fuzzy comprehensive evaluation method to realize the quantization of the possibility of risk occurrence and risk loss. By the quantified possibility of risk occurrence and loss consequences to calculate the risk gene and get the risk quantized valve ultimately. The example shows that fuzzy comprehensive risk evaluation method can realize quantitative treatment of fuzzy and uncertain information and can practically and effectively evaluate the EPC general contractor's risk.

Social progress and environmental deterioration calls for the development of Green Logistics, which entails sustained efforts. In this paper, a fuzzy comprehensive evaluation model has been proposed based on the analysis of the hierarchic structure of Green Logistics system using the combined evaluation method of analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE). This model can be used to judge the satisfaction degree of Green Logistics' performance by quantifying the performance evaluation indicators.

Increasing traffic volume and insufficient road lanes often require municipal roads to be reconstructed and expanded. Where a road passes under a bridge, the reconstruction and expansion project will inevitably have an impact on the bridge. To evaluate the safety impact of road engineering projects on bridges, this paper evaluates the safety of the roads and ancillary facilities of highway bridges involved in municipal road engineering projects. Based on a comprehensive analysis of the safety factors of municipal roads undercrossing existing bridges, a fuzzy comprehensive analytic hierarchy process (AHP) evaluation method for the influence of road construction on the safety of existing bridges is proposed. First, AHP is used to select 11 evaluation factors. Second, the target layer, criterion layer, and index layer of evaluation factors are established, then a safety evaluation factor system is formed. The three-scale AHP model is used to determine the weight of assessment indexes. Third, through the fuzzy comprehensive AHP evaluation model, the fuzzy hierarchical comprehensive evaluation is carried out for the safety assessment index system. Finally, the fuzzy comprehensive evaluation method is applied to the engineering example of a municipal road undercrossing an existing expressway bridge. The comprehensive safety evaluation of the existing bridge reflects the practicability and feasibility of the method. It is expected that, with further development, the method will improve the decision-making process in bridge safety assessment systems.

With the accelerated pace of expressway construction and the increasing of expressway mileage in China, the competition among different expressways and between expressway transportation and other modes of transportation is increasingly fierce. So far, uniform expressway service quality evaluation and management indicator system has not been established in our country. In the context of Hebei Qingyin expressway service quality evaluation standard research project, from the expressway road conditions, traffic operations, management systems, information services, cultural services, safety performance, transportation environment and the quality of user perceived, a system to evaluate the service quality of expressway is accomplished with analytic hierarchy process and fuzzy comprehensive evaluation method. Test results show that the system can greatly improve the work efficiency, and give an objective, fair, and comprehensive evaluation report, and provide multi-level, multi-angle data statistics function according to the evaluation results which make managers analysing key factors affecting the quality of expressway service more convenient.

Battery inconsistency evaluation based on hierarchical weight fusion and fuzzy comprehensive evaluation method

The evaluation of burst-proneness risks has affected the coal and rock mining progress and development. The quality evaluation system framework of burst-proneness risks indexes is established. Fuzzy evaluation index system is proposed to take into account various factors. As to index system, comprehensive fuzzy evaluation model and methods are setup and used to check for practical example. Using comprehensive fuzzy evaluation model and case study, it is concluded that, based on burst-proneness risk evaluation index system, comprehensive fuzzy evaluation method is applied to evaluate and solve the unclear boundary of some burst-proneness risks indexes and inaccurate fuzziness, which is proved to be practicable and feasible.

Tourism industry has enormously flourished owing to the development in the economic conditions as well as with the improvement in the people's living standards. General aviation tourism has become a new form of tourism. This paper evaluated the factors which influence the general aviation tourism industry of Xi'an using Analytic Hierarchy Process (AHP) and Fuzzy Comprehensive Evaluation method, and the following primary factors are considered for evaluation, supply resources of the system, industrial policies, economic level and market demand. The main objective of this research is to promote the development of general aviation tourism industry.

Berthing is one of the most dangerous phases in the process of ship navigation, and its risk assessment is crucial for both ship safety and port scheduling. To effectively enhance the safety and reliability of the berthing process, a berthing risk assessment method based on the synergy of “human-ship-environment” has been established. First, the impact of the human, ship, and environmental factors on berthing risk was analyzed, and a risk assessment index system for ship berthing was constructed. Then, the analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE) methods were employed for a comprehensive risk assessment. AHP was used to determine the weight of each factor reasonably, while FCE was applied for the evaluation of the berthing risk. Finally, the proposed method was applied to evaluate the berthing operations of two ships, namely the KCS ship type and the S-175 large passenger ship type, at the Qingdao Intelligent Ship Testing Field, China. The experiment’s results indicate that the evaluation results of the method proposed here have good consistency with the expert survey method.

Urban underground space development and utilization of the city is an important step towards sustainable development. Gaining enough, fresh air with appropriate temperature and humidity and sufficient sunshine, reducing energy consumption and increasing environment quality are basic requirements for healthy underground space design. The paper puts forward building energy conservation design responses of urban underground space from natural lighting, ventilation and renewable energy utilization three aspects to provide the beneficial reference to sustainable development design of the urban public underground space.

Multi-station integration is an important support for achieving green environmental protection. At present, there are few studies on the evaluation system of multi-station location. Therefore, in this paper the influencing factors of location evaluation of single-station was analyzed in depth to sort out common factors and characteristic factors of multi-stations. Finally, a new evaluation indicator system for multi-station location was proposed, and analysis of candidate sites was conducted based on analytic hierarchy process (AHP) and fuzzy comprehensive evaluation method.

The maglev bogie is the key subsystem for maglev train security. To ensure life and property security, it is essential to evaluate its risk level before its operation. However, due to the complexity and uncertainties of maglev bogies, a comprehensive and effective risk analysis method is needed. In this paper, a combinational method of analytic hierarchy process and fuzzy comprehensive evaluation is proposed to assess hazards in a complex maglev bogie system associated with multiple subsystems' failures. Our results show that the degree of maglev bogie's risk is within the range of acceptability. The merits of this work facilitate finding the weak links and determining the maintenance of maglev bogie system.

Evaluating the electricity market’s service for the utilization of new energies lays an important foundation for the optimization of the electricity market mechanism. However, it has been a rarely studied topic so far. In this paper, a market evaluation model is built with the methods of analytic hierarchy process and fuzzy comprehensive evaluation, covering four dimensions, namely, cleanliness and low carbon, safety and reliability, economics and efficiency, and unification and coordination. An analysis of typical cases shows that the proposed evaluation model can effectively evaluate the level of the electricity market’s service for the utilization of new energies.