Research on the Design for Strip-Partial Mining Method under Villages at Xiaotun Colliery

2011 ◽  
Vol 361-363 ◽  
pp. 217-221 ◽  
Author(s):  
Rui Min Feng ◽  
Jin Long Zhang ◽  
Hui Fu ◽  
Lei Pei
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Coal Pillar ◽  
Field Measurements ◽  
Mining Method ◽  
Pillar Stability ◽  
Surface Movement ◽  
Mining Condition ◽  
Movement And Deformation ◽  
Mining Scheme

Basing on the geological mining condition under villages at Xiaotun Mine, according to the existing theories of the strip-partial mining, using the method of analyzing the field measurements date and calculating by empirical formula, the safe range of mining and retained widths can be confirmed, the mining schemes for different widths of coal pillar can be designed, and the optimum scheme can be worked out; and then the coal pillar stability of each mining scheme will be calculated through numerical simulation analysis, providing the basis for appropriately selecting the optimum scheme; on this basis, through simulation prediction of the surface movement and deformation, the surface movement and deformation laws of strip-partial mining is revealed to guide production of Xiaotun colliery.

Application of Neural Network in Surface Movement and Deformation Analysis

2012 ◽  
Vol 524-527 ◽  
pp. 531-534
Author(s):  
Zhong Ping Guo ◽  
Dao Zhi Chen ◽  
Tao Zhang
Keyword(s):  
Neural Network ◽  
Ground Surface ◽  
Deformation Analysis ◽  
Coal Seams ◽  
Surface Movement ◽  
Probability Integral Method ◽  
Rock Movement ◽  
Movement And Deformation ◽  
Mining Scheme ◽  
Selection Of

In order to make a comprehensive and accurate prediction of surface movement and deformation in the thin coal seams mining under buildings, mathematical model of the selection of rock movement parameter is established by the way of artificial neural network; ground surface movement and deformation is predicted and analyzed through probability integral method, mining scheme of the thin coal seams mining under buildings in a coal mine is determined.

Short Wall Box Style Mining Method of Strip Coal Pillar under Town

2011 ◽  
Vol 121-126 ◽  
pp. 4146-4150 ◽  
Author(s):  
Zhong Ping Guo ◽  
Jia Zhuo Li ◽  
Chang Hua Li ◽  
Hai Bin Ge
Keyword(s):  
Integration Method ◽  
Plate Theory ◽  
Coal Pillar ◽  
Economic Advantage ◽  
Ground Movement ◽  
Strip Mining ◽  
Mining Method ◽  
Environmental Benefit ◽  
Support Plate ◽  
Movement And Deformation

To recover strip coal pillar and reduce cost after strip mining, the short wall box style mining method was presented. Strata stability was analyzed based on support plate theory, mechanical model of the second strata movement was created, and safety factor was deduced .The ground movement and deformation were predicted, with probability integration method. The application demonstrates that this mining method can protect buildings on earth’s surface, improve the recovery ratio of coal and reduce cost. This mining method has a good economic advantage and environmental benefit.

Research on Numerical Simulation of Mining Subsidence

2011 ◽  
Vol 148-149 ◽  
pp. 384-387 ◽  
Author(s):  
Hong Ji ◽  
Xue Yi Yu
Keyword(s):  
Numerical Simulation ◽  
Mining Subsidence ◽  
Strip Mining ◽  
Mining Method ◽  
Surface Movement ◽  
Mining Conditions ◽  
The Law ◽  
Project Data ◽  
Mechanical Dynamics ◽  
Overlying Strata

The strip mining method is proposed to prohibit overlying strata and surface moving. The law of displacement and deformation damage of overlying strata and surface which is a sophisticated process of physical and mechanical dynamics is analyzed in theory. Based on the actual project data, the law is obtained by the numerical simulation with FLAC3D. Moreover, the strip reasonable mining method and interrelated parameters is presented according to the specific geology and mining conditions of coal. It is proved that the strip mining method can avoid geological damage effectively for overlying strata and surface movement in practice.

Numerical Simulation of Breaking Arch Evolution Rule of Coal Seams Mining

2013 ◽  
Vol 734-737 ◽  
pp. 777-780
Author(s):  
Jian Quan Tang ◽  
Yu Ting Hou ◽  
Chao Zhang ◽  
Jian Hao
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Coal Pillar ◽  
Superposition State ◽  
Coal Seams ◽  
Independent State ◽  
Evolution Rule ◽  
Length Changes

Numerical simulation analysis were done on breaking arch developing and evolving process of both single stope and coal seams mining field by FLAC3D. Results show that in single strope's advancing process, breaking arch's height would be different as strope's length changes, and breaking arch's height was decided by strope's length; in composite strope, as the coal pillar increasing, composite strope's breaking arch gradually develops from superposition state to independent state; as the strope's length changing composite strope's superposition state tend to balance

Optimization Coal Pillar Size of Top Coal Caving Face with Dynamic Pressure Impact

2014 ◽  
Vol 675-677 ◽  
pp. 1395-1400 ◽  
Author(s):  
Wen Zhou Li
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Simulation Analysis ◽  
Dynamic Pressure ◽  
Coal Pillar ◽  
Large Error ◽  
Working Face ◽  
Pressure Impact ◽  
Mine Depth ◽  
Pillar Size

AH Wilson coal pillar was used widely as it’s simply, but it’s appeared large error for field implementation as its difference assume conditions, mine depth H and mine thickness m. AH Wilson coal pillar formula was studied precisely by in-site stresses test and numerical simulation analysis for N3-5 top coal caving working face of CHANGCUN coal mine in Lu’an coal district of China, then modified AH Wilson formula was put forward as L = 0.008mH + 8.4,then the precise coal pillar size 18m was used in filed implementation, filed testing proved coal pillar size was reasonable.

Modeling and Numerical Optimal Simulation of Coal Pillar’s Failure Process on Longwall Leaving Coal Pillar Mining

2011 ◽  
Vol 88-89 ◽  
pp. 285-290 ◽  
Author(s):  
Xiao Ping Shao ◽  
Yu Cheng Xia
Keyword(s):  
Optimization Design ◽  
Design Research ◽  
Failure Process ◽  
Coal Pillar ◽  
Shaanxi Province ◽  
Mining Method ◽  
Pillar Stability ◽  
Plastic Failure ◽  
Mining Methods ◽  
Coal Pillars

To further optimize mining methods and parameters at regions of “protecting water mining”, this paper has made modeling and numerical optimal simulation of coal pillar’s failure process under two kinds of mining method including “taking 8 remaining 7” leaving the region pillars and “taking 12 remaining 8” leaving strip coal pillars for Yubojie coal mine in northern Shaanxi province in China. Simulation showed that the stability of strip coal pillars is better than the region coal pillars at the same advancing distance. The region coal pillars first appeared corner plastic failure and maybe become hexagonal pillars. Plastic failure of the rectangular pillar extended and penetrated from the corner along the edge. Plastic damage of pillars showed tendency from the middle to the roadway side of the face along the length direction of face. Stability of central elastic core of coal pillar is the basis of pillar stability. Simulation results showed that it is feasible to optimize mining methods and parameters of “protecting water mining" areas based on modeling and numerical simulation of pillar failure process. The method has provided a useful reference to mining method and optimization design research for other regions with same type of domestic and international coal mines.

Numerical Simulation Analysis on Stability of Coal Pillar of Empty Mine Goaf in North of Shanxi Province

2013 ◽  
Vol 470 ◽  
pp. 205-210
Author(s):  
Hao Tang ◽  
Zi Guang He ◽  
Hai Bo Lian
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Coal Pillar ◽  
Shanxi Province ◽  
Analysis Model ◽  
Term Stability ◽  
Long Term Stability ◽  
The Law ◽  
The Stability

The analysis model of coal pillar of a empty mine goaf in north of Shanxi province was constructed and the process of coal pillar from formation to weathering was simulated through the application of software of FLAC3D in this article. The stressstrain and the law of plasticity transformation of coal pillar from formation to weathering were analyzed and the long-term stability of coal pillar was forecasted. The result showed that the stability of coal pillar was bad for excessive excavated and weathering and the coal pillar will be broken easier for pressure and shear.

Study on the Law of Ground Subsidence for Shallow Buried and Thick Coal Seam by Fully Mechanized Caving Mining Method

2014 ◽  
Vol 1010-1012 ◽  
pp. 1554-1559 ◽  
Author(s):  
Gui Liu ◽  
Nai Zhong Xu ◽  
Kai Hua Sun
Keyword(s):  
Coal Seam ◽  
Ground Surface ◽  
Ground Movement ◽  
Active Period ◽  
Mining Method ◽  
Thick Coal Seam ◽  
Surface Movement ◽  
Movement And Deformation ◽  
The Law ◽  
Ground Surface Movement

In order to master the law of ground surface movement and deformation for shallow buried and thick coal seam under condition of fully mechanized caving mining method, and to gain experience of “mining under buildings, water body and railway”, a ground surface movement observation station was established above 14106 and 14107 working face of No.1 Well which belongs to China Coal Pingshuo Group co., Ltd. Then a series of observation was conducted according to the requirements of relevant technology. After that, process of sorting, calculating, analysis was conducted based on the observation data. As a result, characteristics of surface movement and deformation under this mining and geological condition were mastered by author, the surface subsidence calculation parameters and some surface movement angle parameters was calculated. Based on analysis of ground depression velocity and deflection in the period of ground movement, it is concluded that shallow buried depth with fully mechanized caving mining method has a shorter ground movement active period than that of deep mine, at the same time, its maximum subsidence velocity is big, ground movement and deformation is strenuous and subsidence during ground movement active period occupies a huge proportion of the total subsidence.

scholarly journals Simulation Research for the Influence of Mining Sequence on Coal Pillar Stability under Highwall Mining Method

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jing Huang ◽  
Fanbao Meng ◽  
Ge Wang ◽  
Yingkui Wu ◽  
Jinhao Wen
Keyword(s):  
Great Influence ◽  
Coal Pillar ◽  
Simulation Method ◽  
Mining Method ◽  
Pillar Stability ◽  
Simulation Research ◽  
Highwall Mining ◽  
Mining Sequence ◽  
Coal Pillars ◽  
Highwall Stability

Highwall mining, which is referred to the technique of extracting coal from the bottom of an exposed highwall, features safety, efficiency, and economy. According to existing highwall mining methods, the mining sequence has a great influence on highwall stability. Based on a highwall mining project in Australia, this study adopted the FLAC3D numerical simulation method to investigate the stability of coal pillars with different mining sequences. The results show that different mining sequences of boreholes exert a great effect on highwall stability. Compared with sequential mining, the skip mining method achieves higher speed of highwall stabilization and smaller plastic zone of coal pillar with its maximum strength decreasing by 12%. By adjusting the mining sequence scientifically, the coal pillar failure and roof collapse caused by the deviation of mining angle can be avoided. The results may provide a new angle for the studies on the coal pillar layout and stability design in highwall mining.

Study on Surface Movement and Deformation Characteristics and Pillar Stability of Large Strip Mining under Deep Mining

2013 ◽  
Vol 734-737 ◽  
pp. 531-534
Author(s):  
Jun Tao Chen ◽  
Kai Kai Sheng ◽  
Li Min Yin ◽  
Chuan Qiang Wu
Keyword(s):  
Practical Significance ◽  
Strip Mining ◽  
Deformation Characteristics ◽  
Mining Technology ◽  
Pillar Stability ◽  
Deep Mining ◽  
Surface Movement ◽  
Working Face ◽  
Movement And Deformation ◽  
Overlying Strata

Large strip mining technology could effectively control the surface subsidence inducing from overlying strata movement and realize green mining. Bored stress and deformation sensors were laid in 4301 working face pillar of Shandong energy zibo mining group tangkou coal, analyzing the strip pillar stress pre and post working face; numerical simulation was used to study the influence of overlying strata from reserved size of strip pillar. According to the observation results of surface movement and deformation, law of surface movement and deformation characteristics was studied, which contributed to the practical application of large strip mining technology under deep mining and had the important theoretical and practical significance for mining under buildings ,railways and water in Chinese.

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