scholarly journals Stability Assessment of Ground Surface along Tunnels in Karst Terrain Using Improved Fuzzy Comprehensive Evaluation

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Kai Zhang ◽  
Zelin Zhou ◽  
Shougen Chen
Keyword(s):  
Comprehensive Evaluation ◽  
Ground Surface ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment System ◽  
Stability Assessment ◽  
Karst Terrain ◽  
Surface Stability ◽  
Ground Collapse ◽  
The Stability ◽  
Assessment Results

The stability of ground surface along tunnels in karst terrain is influenced by complex factors, among which the karst features are the significant ones. Under the influence of karst, the ground surface along tunnels is very easy to collapse, thus causing great casualties and economic losses. To provide guidance for maintaining the stability of ground surface along tunnels, an analysis system is proposed for assessing the stability of ground surface along tunnels in karst terrain based on an improved fuzzy comprehensive evaluation. Based on the case analysis of ground collapse along tunnels in karst terrain and the review of the related researches, the evaluation index system for ground surface stability assessment was established. The ridge-shaped membership functions were constructed to calculate the membership degree for the evaluation indices. The comprehensive weighting method combining the Fuzzy Analytical Hierarchy Process and correlation analysis was applied to determine weights for evaluation indices. And the ground surface stability level was recognized based on the maximum membership principle. The proposed assessment system was applied to assess the ground surface stability along the tunnels of Guiyang Metro Line 1, and the assessment results agreed well with the regional ground collapse history, verifying the effectiveness and reliability of the assessment system. Combining with the assessment results, a series of measures were conducted to promote the ground surface stability before tunnel excavation. This system provides a valuable tool for assessing and guiding to improve stability of the ground surface along tunnels in karst terrain.

Analysis and Design of Intelligent Assessment System for Supplier Service Quality

2013 ◽  
Vol 712-715 ◽  
pp. 2686-2691
Author(s):  
Lian Jie Wang
Keyword(s):  
Service Quality ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Research Result ◽  
Fuzzy Comprehensive Evaluation ◽  
Relevant Information ◽  
Assessment System ◽  
Index Set ◽  
Analysis And Design ◽  
Paper Form

Through the study of the multiple dimensions of supplier, this paper comes up with an index system of evaluating the quality of supplier service quality and studies the analysis and design of intelligent assessment system for supplier service quality. Based on the extensive collection of survey research result, the paper form an index set with the KPI method, then form the fuzzy comprehensive evaluation model. This intelligent assessment system map all relevant information of supplier that an earlier entered to the evaluating indicator, then output the assessment result. With the help of this system, the purpose of providing reference for that managers make decisions is attain.

Study on the Maintenance Capacity of “Man-Machine System” Based on Fuzzy Comprehensive Evaluation

2012 ◽  
Vol 203 ◽  
pp. 479-483
Author(s):  
Yong Jun Sun ◽  
Yi Qu
Keyword(s):  
Complex System ◽  
Quantitative Analysis ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Fuzzy Mathematics ◽  
Machine System ◽  
The Core ◽  
Evaluation Algorithm ◽  
The Stability ◽  
Index Weight

This paper, in accordance with the maintenance capacity of “Man-Machine System”, holds the core of the “Man-Machine System” and employs the analysis methods of the complex system, brings forward the model of the three-layer comprehensive evaluation based on fuzzy mathematics, then brings out the methods of the index weight and studies the maintenance capacity’s evaluation algorithm on the foundation of the quantitative analysis. In the last it gives the application of the model and algorithm by using the instances and studies the changing maintenance capacity including the stability and the undulation, which provides one thought for scientifically evaluating the maintenance capacity of “Man-Machine System”.

Fuzzy comprehensive evaluation method for integral stability of box girder with corrugated steel webs

2021 ◽  
pp. 1-14
Author(s):  
Bo Xu ◽  
Chuanxi Li ◽  
Yiqing Zhang
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Box Girder ◽  
Fuzzy Comprehensive Evaluation Method ◽  
Comprehensive Evaluation Method ◽  
Overall Stability ◽  
Corrugated Steel Web ◽  
The Stability ◽  
Index Weight

The traditional stability evaluation method of corrugated steel web box girder ignores the calculation of evaluation index weight, which leads to large deviation of evaluation results. Therefore, a new fuzzy comprehensive evaluation method for the overall stability of box girder with corrugated steel webs is proposed. According to the structural characteristics of corrugated steel web box girder, the stability coefficient of corrugated steel web box girder is calculated, and the stability calculation index of corrugated steel web box girder is obtained. In this paper, the constraint equation of bridge instability process is introduced, and Midas civil software is used to simulate the instability of box girder with corrugated steel webs during bridge construction. Based on this, the instability of the bridge is analyzed, the index weight of the anti-instability ability of the box girder with corrugated steel webs under different loads is calculated, and the overall stability of the box girder with corrugated steel webs is evaluated by fuzzy comprehensive evaluation. The test results show that this method can accurately evaluate the overall stability of box girder with corrugated steel webs, and the calculation accuracy is increased by 32.7% and the calculation speed is increased by about 1.62 seconds. It has high credibility and authenticity.

The Quantitative Evaluation of Coal Seam Stability Based on Component GIS

2012 ◽  
Vol 500 ◽  
pp. 168-174
Author(s):  
Long Quan Chen ◽  
Run Yuan Kuang
Keyword(s):  
Coal Seam ◽  
Quantitative Evaluation ◽  
Spatial Data ◽  
Theoretical Basis ◽  
Assessment System ◽  
Current Status ◽  
Stability Assessment ◽  
Stability Evaluation ◽  
Component Gis ◽  
The Stability

The stability of the mining is important for coal, and stability of the current status of coal was analyzed, selecting appropriate indicators that evaluate the importance of stability of the coal seam is so significant. Using GIS Spatial database to achieve a unified data management for spatial data and attributes, and analyze of coefficient of variation of coal thickness and correlation dimension of coal thickness, and use of these two indicators of a coal mine in the coal seam to analyze stability evaluation. Finally, developed stability assessment system of coal based on component-based GIS MapX. The results show that quantitative evaluation of the stability of the coal is reliable, can provide a theoretical basis for coal mining.

scholarly journals Key Factors Identification and Risk Assessment for the Stability of Deep Surrounding Rock in Coal Roadway

2019 ◽  
Vol 16 (15) ◽  
pp. 2802 ◽  
Author(s):  
Dongmei Huang ◽  
Weijun Li ◽  
Xikun Chang ◽  
Yunliang Tan
Keyword(s):  
Risk Assessment ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Mining Area ◽  
Surrounding Rock ◽  
Risk Level ◽  
Affecting Factors ◽  
Key Factors ◽  
The Stability

In order to evaluate the stability of deep surrounding rock, all of the affecting factors should be theoretically identified. However, some factors have slight impacts on the stability of deep surrounding rock compared with others. To conduct an effective risk assessment, key factors should be first extracted. The analytic hierarchy process (AHP) and grey relation analysis (GRA) methods are integrated to determine the key factors. First, the AHP method is applied to sort the factors by calculating the weights of them. Seven out of fifteen factors are extracted as the key factors, which account for 80% of the weights. Further, the GCA method is used to validate the effects of these key factors by analyzing the correlation between the performance of each factor and that of the reference. Considering the influence of these key factors and experts’ judgements, the multilevel fuzzy comprehensive evaluation method is adopted to obtain the risk level of the deep surrounding rock stability. Finally, the risk assessment of the deep surrounding rock in the E-Zhuang coal mine of Chinese Xinwen Mining Area illustrates the operability of the proposed method.

Study on the Enrichment Degree of Coalbed Methane Based on the Fuzzy Comprehensive Evaluation

2010 ◽  
Vol 34-35 ◽  
pp. 815-819
Author(s):  
Xiang Zhen Yan ◽  
Bao Hui Wang ◽  
Xiu Juan Yang
Keyword(s):  
Coalbed Methane ◽  
Reference Model ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment System ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Fuzzy Mathematics ◽  
Mathematics Model ◽  
Fuzzy Mathematics Model

Considering the various influencing factors of enrichment of coal bed methane, the evaluation indexes of enrichment for coal bed methane are determined. The weight values of all factors indexes are given and the fuzzy mathematics model is established on the basis of the fuzzy mathematics. As a case study, the fuzzy mathematics model is applied to the assessment of enrichment of coal bed methane. The results show that the No.5 coal seam of Shan 2 of Shanxi formation in Daning-Jixian is a better enrichment area. The evaluation result performed on the basis of the fuzzy mathematics model is in good agreement with the measured result. The example indicates that the method is credible and has high precise. The assessment system established in the paper can be regarded as a reference model in coal bed methane exploitation potential assessment.

A Study on the Quality Assessment System of Substructure Reinforcement Method

2013 ◽  
Vol 351-352 ◽  
pp. 1358-1363
Author(s):  
Wen Da Zhang ◽  
Yang Jian Xiao ◽  
Jun Cheng
Keyword(s):  
Quality Assessment ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment System ◽  
Application Process ◽  
Analytic Hierarchy ◽  
Actual Application ◽  
Practical Engineering ◽  
Reinforcement Quality

For substructure reinforcement method, corresponding quality assessment system is established based on analytic hierarchy process (AHP). At the same time, the actual application process of the system was found. Structure of judgment matrix, synthetic weight and for each layer of element and fuzzy comprehensive evaluation was figured out. Finally, the system is verified by practical engineering. Something is obvious as the result shows. Firstly, the comprehensive assessment system for reinforcement quality of bridges is reasonable and practical. Secondly, this system takes some advantages to the systematization, standardization and theorization for the assessment to reinforcement quality of bridges.

Analysis of the Surrounding Rock's Stability Based on Fuzzy Comprehensive Evaluation Model

2012 ◽  
Vol 226-228 ◽  
pp. 1390-1395
Author(s):  
Xia Zhong Zheng ◽  
Qiao Ling Chen ◽  
Hua Fei Li ◽  
Peng Fei Shi
Keyword(s):  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Surrounding Rock ◽  
Underground Engineering ◽  
Rock Classification ◽  
Engineering Construction ◽  
Comprehensive Evaluation Model ◽  
Hydropower Engineering ◽  
The Stability

In underground engineering construction of water conservancy and hydropower engineering, determining surrounding rock excavation and supporting construction measures and parameters according to the classification of surrounding rock's stability is an effective method. In hydropower engineering field, it made some achievements of surrounding rock classification through the engineering geological mechanics parameters. but there are some problems in the application. After the study, this paper established a fuzzy comprehensive evaluation model to determine the stability of surrounding rock. Practice has proved it to be more reasonable.

Sign in / Sign up

Export Citation Format

Share Document