scholarly journals Stability Evaluation of an Expressway Construction Site above an Abandoned Coal Mine Based on the Overlay and Index Method

2019 ◽  
Vol 11 (19) ◽  
pp. 5163 ◽  
Author(s):  
Qingbiao Guo ◽  
Guangli Guo ◽  
Yingming Li ◽  
Lei Wang ◽  
Xingwang Zhao
Keyword(s):  
Coal Mine ◽  
Traffic Safety ◽  
Evaluation Model ◽  
Scoring Functions ◽  
Construction Site ◽  
Stability Evaluation ◽  
Index Method ◽  
Expressway Construction ◽  
The Stability ◽  
Abandoned Coal Mine

In recent years, more and more expressways pass through the abandoned coal mine, while the surface residual subsidence of the abandoned coal mine threatens the operation safety of the expressway. It is of significance to evaluate the stability of the construction site and take reasonable managements for effectively guaranteeing the traffic safety. How to accurately evaluate the stability of the construction site is the primary problem. This study proposes a stability evaluation model using the overlay and index method and points out that the evaluation scores and weights of evaluation indices are key parameters to determine the reliability of evaluation results. To reasonably determine the evaluation score, the scoring criteria of qualitative indices is obtained by the equidistant method, while the scoring criteria of quantitative indices is obtained by establishing scoring functions. The weights of evaluation indices are got by adopting the FAHP (fuzzy analytic hierarchy process). Then the built model is applied to evaluate the stability of the Wuyun Expressway construction site, and the results show that the Wuyun Expressway construction site is basic stable. Finally, the sensitivity of indices weights on the evaluation result is analyzed with the maximum C k ( C m , p c ) of 5.9% far lower than the weight change of ±30%, and the average residual subsidence velocity of the maximum subsidence point is 0.0456 mm/d using a high-resolution leveling, proving the credibility of the proposed model. Research results provide new ideas and systematic technical references for the stability evaluation of the construction site above an abandoned coal mine.

Sustainability evaluation model of geothermal resources in abandoned coal mine

2018 ◽  
Vol 144 ◽  
pp. 804-811 ◽  
Author(s):  
Pingye Guo ◽  
Liange Zheng ◽  
Xiaoming Sun ◽  
Manchao He ◽  
Yanwei Wang ◽  
...  
Keyword(s):  
Coal Mine ◽  
Evaluation Model ◽  
Sustainability Evaluation ◽  
Geothermal Resources ◽  
Abandoned Coal Mine

scholarly journals The Stability Evaluation of Shaft during Drastic Drawdown Dewatering of Alluvium

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Mingze Du ◽  
Yanchun Xu ◽  
Heng Duan ◽  
Wen Li
Keyword(s):  
Coal Mine ◽  
Load Level ◽  
Stability Evaluation ◽  
Early Prevention ◽  
Discriminant Model ◽  
Fisher Discriminant ◽  
The Stability ◽  
And Control ◽  
Shaft Failure ◽  
Shaft Wall

The hydrophobicity of the aquifer at the bottom of the porous alluvium will affect the stability of the shaft. According to the changes of water level and the compressive amount of alluvium, we can evaluate the shaft stability and predict the shaft failure. In this work, the simulation model of the auxiliary shaft in the Zhuxianzhuang Coal Mine is generated by using the Nsdc software to evaluate the stability of the shaft during drastic drawdown dewatering. Based on the measured hydrophobic compression ratio in an adjacent coal mine, the compressive amounts of the strata near the main and auxiliary shafts in the Zhuxianzhuang Coal Mine are predicted under the condition of drastic drawdown dewatering, which will be 249.69 mm and 302.75 mm, respectively. It is more likely that the shaft wall may fracture in the 15th day (fourth load level) under the condition of drastic drawdown dewatering. The formation compressive amount near the auxiliary shaft is approximately 320 mm, which is close to the measured predicted value. At the same time, the Fisher discriminant model is established, and it is predicted that the state of the main and auxiliary shafts will be failure under the conditions of drastic drawdown dewatering in the Zhuxianzhuang Coal Mine. Based on the simulating results, the technical means of using the ground grouting for early prevention and control is proposed.

scholarly journals Research on the Stability Evaluation Model of Composite Support Pillar in Backfill-Strip Mining

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Xiaojun Zhu ◽  
Guangli Guo ◽  
Hui Liu ◽  
Xueni Peng ◽  
Xiaoyu Yang
Keyword(s):  
Evaluation Model ◽  
Limit Equilibrium ◽  
Coal Pillar ◽  
Earth Pressure ◽  
Strip Mining ◽  
Stability Evaluation ◽  
Composite Support ◽  
Filling Materials ◽  
Support Pillar ◽  
The Stability

Backfill-strip mining, which combines the advantages of strip mining and backfill mining, is proposed to overcome high cost and shortage of filling materials in coal mines at present. The composite support pillar (CSP) is a combined support pillar of the filling body and coal pillar for supporting the overlying strata and achieving subsidence control. The stability of CSP is the key to the success of subsidence control in backfill-strip mining engineering. A stability evaluation model of the CSP mechanical model was proposed. First, the lateral stress between the coal pillar and filling body is calculated in consideration of their interaction relation in CSP based on the earth pressure theory. Then, the width calculation models of the broken and plastic zones of three types of CSPs are established on the basis of limit equilibrium theory. On this basis, the mathematical model of the safety design width of the three types of CSPs is proposed to ensure the stability of CSP. Meanwhile, an engineering case of stability width design of CSP is shown. This study can provide theoretical reference and technical support for the engineering design of backfill-strip mining.

Water Traffic Safety Evaluation Based on the Grey Correlation Grade Analysis

2014 ◽  
Vol 571-572 ◽  
pp. 295-298
Author(s):  
Ying Xiang Teng ◽  
Hu Gang Zhao ◽  
Jie Yang ◽  
Jin Lu Sheng
Keyword(s):  
Traffic Safety ◽  
Evaluation Method ◽  
Evaluation Model ◽  
Safety Evaluation ◽  
Economic Loss ◽  
Original Data ◽  
General Level ◽  
Index Method ◽  
Grey Correlation ◽  
Grey Relational Grade

Aiming at the deficiency of the water traffic safety evaluation method in our country, the water traffic safety evaluation model was established after full discussing, which is based on grey relational grade analysis. The water traffic safety status of shipping companies was evaluated through their correlation, which is on the basis of the Five index method, after the original data in a reasonable manner of dimensionless processing. Through a case of a shipping group, it is proved that the grey correlation greed analysis method can evaluate enterprise's security situation simply and effectively on the basis of original index of death toll, the number of accidents above General level, the number of ship destroyed and direct economic loss. Additionally, the evaluation is more objective and scientific.

Slope Stability Evaluation by the Improved AHP and Extenics Theory

2013 ◽  
Vol 405-408 ◽  
pp. 106-110 ◽  
Author(s):  
Guo Song Liu ◽  
Chun Ming Qi ◽  
Chun Long Nie ◽  
Jie Hu
Keyword(s):  
Correlation Function ◽  
Slope Stability ◽  
Evaluation Model ◽  
Stability Evaluation ◽  
Analytic Hierarchy ◽  
Judgment Matrix ◽  
The Stability ◽  
Hierarchy Process ◽  
The Relationship ◽  
Element Theory

According to the improved 3 scales (0, 1, 2) Analytic Hierarchy Process (E-AHP) and Extenics theory, an evaluation model is built to evaluate the slope stability. The model takes into account nine indexes that affect the slope stability. The classical matter element and extensional matter elemen are established by collectting actural data. And combined with the specific example, this model accurately calculated the stability state of the slope. The results shown that it not only can take advantage of Extenics Matter-Element theory and the correlation function to study the relationship between index and slope stability, but also can avoid the shortcomings of the traditional AHP judgment matrix inconsistent. It is a new model to evaluate the slope stability.

The Fuzzy Matter-Element Comprehensive Evaluation Model for Erosion Stability of Geocell Protection of Slope and its Application

2012 ◽  
Vol 594-597 ◽  
pp. 2945-2950
Author(s):  
Guang Yue Wang ◽  
Jan Wu Zhao
Keyword(s):  
Index System ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Element Model ◽  
Stability Evaluation ◽  
Correlation Degree ◽  
Comprehensive Evaluation Model ◽  
The Index System ◽  
The Stability ◽  
Matter Element Model

To solve the existing fuzziness in the grading of stability evaluation of geocell protected slope and inconsistent between evaluation result by single index and the fact, this paper establishes index system of the stability evaluation of geocell protection of slope and propose a method. First, two-grade Fuzzy Matter-element Model is established based on the index system. Second, factor weights of evaluation index are calculated by AHP. Finally, the grade of the stability of geocell protection of slope is obtained based on Correlation Degree. Analysis results show that based on comprehensive consideration of subjective factors and objective factors, this method is effective and agrees well with engineering practical.

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