Regression analysis and stability evaluation of the coal mine gateway roof abscission layer

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.

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The Stability Evaluation of Roadway Surrounding Rock in QingFeng Coal Mine

Proceedings of the 2014 International Conference on Mechanics and Civil Engineering ◽

10.2991/icmce-14.2014.3 ◽

2014 ◽

Cited By ~ 1

Author(s):

Pai-Ke WEN ◽

Yu-Jun ZUO ◽

Xiao-Yan PU ◽

Yue-Qin QIU ◽

Bo TANG

Keyword(s):

Coal Mine ◽

Surrounding Rock ◽

Stability Evaluation ◽

The Stability

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

Sustainability ◽

10.3390/su11195163 ◽

2019 ◽

Vol 11 (19) ◽

pp. 5163 ◽

Cited By ~ 2

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.

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Experimental Study on the Compression Rebound Modulus of Coal Gangue Mixture

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.608-609.1759 ◽

2012 ◽

Vol 608-609 ◽

pp. 1759-1763

Author(s):

Xian Hai Xu ◽

Ya Peng Zhang ◽

Zhi Fei Zhang ◽

Ju Jun Zhang

Keyword(s):

Experimental Study ◽

Regression Analysis ◽

Fly Ash ◽

Coal Mine ◽

Uniform Design ◽

Regression Equation ◽

Coal Gangue ◽

Analysis Model ◽

Mix Proportion ◽

Cement Mixture

This experiment was designed by making a coal gangue with coal gangue, fly ash, lime power and a small amount of cement mixture selected from Dongpang coal mine in Hanxing area.We tested the compressive rebound modulus strength of the mixture, and according to the method of uniform design, 8 groups mix ratio were designed and the experiments on the coal gangue mixture in various mix proportion have been conducted. The experimental results were analyzed by regression analysis model, and the regression equation between the compression rebound modulus of coal gangue mixture and the blending amount of each admixture was established. Finally, using this regression analysis model, the influence of the fly ash, calces, cement to strength on the compression rebound modulus of coal gangue mixture was analyzed.

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Development of modeling procedures for coal mine stability evaluation

Rock Mechanics Contributions and Challenges: Proceedings of the 31st U.S. Symposium ◽

10.1201/9781003078944-16 ◽

2020 ◽

pp. 85-92

Author(s):

H.N. Maleki

Keyword(s):

Coal Mine ◽

Stability Evaluation ◽

Mine Stability

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Prediction and Assessment of Back Break by Multivariate Regression Analysis, and Random Forest algorithm in hot strata/fiery seam of open-pit coal mine

10.21203/rs.3.rs-267513/v1 ◽

2021 ◽

Author(s):

Mukul Sharma ◽

Bhanwar Singh Choudhary ◽

Hemant Agrawal

Keyword(s):

Regression Analysis ◽

Random Forest ◽

Coal Seam ◽

Coal Mine ◽

Multivariate Regression ◽

Multivariate Regression Analysis ◽

Open Pit ◽

Design Parameters ◽

Random Forest Algorithm ◽

Blast Design

Abstract Coal seam in mines sometimes catches fire due to its property of spontaneous heating. Drilling and blasting techniques are the most economical operation for the removal of overburden and extraction of coal in an open-pit coal mine. Blasting in a fiery seam is one the most dangerous and risky operations and various environmental and technical problems are associated with it. While blasting in a fiery coal seam, it is essential to use the minimum amount of explosive in a hole and the blast should be taken quickly. As the amount of explosive to be used must be comparatively lesser; therefore, it becomes important to perform the blasting in a manner to maximize the utilization of explosive energy. Improper utilization of energy causes back break, which is one of the technical concerns for management due to the in-stability of high wall. This study is a unique attempt to predict back break, especially in fiery coal seam through the experimental blasts and their analysis by Multivariate Regression Analysis (MVRA), and Random Forest algorithm (RFA). Total 26 blasting were conducted at open pit mine. To obtain the most optimum blast design parameter, blast design parameters were varied. The observed back break during trial blasts varies from 1.4 to 10 m. The Sensitivity analysis performed with the collected data and it has been found that stiffness ratio and stemming length are the most influential parameters on generation of back break. The MVRA and RFA analysis have been adopted for accurate prediction of back break. The results show that the RFA analysis predicts the backbreak and achieved the RMSE of ± 0.59 m while in MVRA, RMSE achieved was ± 0.99 m, making RFA more suitable method to be used for backbreak prediction in fiery seam blasting.

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Stability Evaluation to Mined-Out Region

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.594 ◽

2012 ◽

Vol 204-208 ◽

pp. 594-598

Author(s):

Li Ying Peng ◽

Yu Ying Zeng ◽

Gui Cheng Su

Keyword(s):

Sustainable Development ◽

Coal Mine ◽

Comprehensive Analysis ◽

Development Research ◽

Stability Evaluation ◽

Analysis Model ◽

Geological Characteristics ◽

Multiple Factors ◽

Surrounding Environment ◽

Mining Conditions

Combined with the collected mining conditions and geological characteristics of coal mine mined-out areas, this paper analysed the present collapse situation of the coal mine mined-out area, the mechanism and influence of the surrounding environment. It puts forward the comprehensive analysis model considering multiple factors. And corresponding conclusions could provide theoretical guidance for urban planning, construction and sustainable development research.

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