scholarly journals Ground Subsidence Evolution from 1000 m Deep Mining: A Case Study in Fengfeng Mining Area

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yueguan Yan ◽  
Ming Li ◽  
Jibo Liu ◽  
Weitao Yan ◽  
Jinman Zhang ◽  
...  
Keyword(s):  
Eastern China ◽  
Mining Area ◽  
Ground Subsidence ◽  
Small Displacement ◽  
Deep Mining ◽  
Deep Mine ◽  
Surface Movement ◽  
Mining Depth ◽  
Movement And Deformation ◽  
Influence Radius

The mining of coal resources in eastern China has entered the stage of deep mining, and many mines have reached the depth of 1000 meters. Different from shallow and moderate depth mining, the temporal and spatial evolution regulation of surface movement and deformation under deep mining has its particularity. Combining with the geological and mining conditions of Fengfeng mining area, this paper systematically studies the characteristics of surface movement under the condition of shallow, moderate, and near kilometer mining depth. By means of field measurement, InSAR monitoring, we get the subsidence data under different mining depth and get the relevant subsidence parameters by inversion. Through comparative analysis, the special law of subsidence under the mining depth of 1000 meters is obtained. The results show that under the condition of nearly 1000 meters mining depth, the surface movement and deformation have the characteristics of large displacement angle, small displacement deformation value, and large main influence radius. The regulation of small proportion of active period of maximum subsidence point, gentle shape of surface movement basin, and low mining adequacy are obtained. The research results provide technical references for deep mining under buildings, railways, and water bodies and provide basis and reference for scientific mining and safe recovery of coal pillars in kilometer deep mine.

Study on the Regularity of Surface Movement and Deformation in Long Coal Face with Large Mining Height

2012 ◽  
Vol 594-597 ◽  
pp. 86-91
Author(s):  
Zu Qiang Xiong ◽  
Jun He ◽  
Lei Lei Zhao
Keyword(s):  
Horizontal Displacement ◽  
Mining Area ◽  
Coal Seams ◽  
Coal Face ◽  
Abscission Layer ◽  
Surface Movement ◽  
Face Length ◽  
Large Mining Height ◽  
Movement And Deformation ◽  
Space Range

It is an important way to realize mine intensive production by increasing of the coal face length. During the transformation period of mining methods about thick coal seams, the character parameters of surface movement and deformation will be provided to guarantee scientifically mining of thick coal seams in Jincheng mining area. In this paper, numerical simulation, theoretical analysis and field measurement are used for studying the influence of coal face length on surface movement and deformation in the condition of large height mining. The results show that the separated strata space range extended with the increasing of coal face length and advancing distance, the surface movement and deformation become more violent, the mining influenced range also gradually expands, and the maximum surface subsidence and horizontal displacement increases gradually in form of linear relationship. In the condition of fast mining, the duration of abscission layer reduces, and the surface movement and deformation shows obviously hysteretic and zonal characteristic.

Analysis on Ground Subsidence in Underground Mining

2011 ◽  
Vol 383-390 ◽  
pp. 2201-2205
Author(s):  
Xin Xi Liu ◽  
Xue Zhi Wang
Keyword(s):  
Underground Mining ◽  
Ground Deformation ◽  
Coal Pillar ◽  
Mining Area ◽  
Ground Subsidence ◽  
Recovery Coefficient ◽  
Mining Width ◽  
Movement And Deformation ◽  
Relationship Of ◽  
The Relationship

Analysis on the characters of ground subsidence of Yangjiaping mining area, with same excavation depth and recovery coefficient, the numerical simulations to nonlinear large deformation using finite-difference method(FLAC) are achieved on the different strip extraction schemes that adopted different mining and reservation width. The result indicates that the subsidence values and horizontal deformation increases with the increasing of the strip extraction width on condition of the same recovery rate. Based on probability density function (PDF) method, the relationship of the coal pillar width, the mining width and ground deformation is acquired, which is some useful reference for using the strip extraction method to control the surface movement and deformation.

Study and Entironmental Impact Evaluation on an Expanding Project of Coal Mine

2012 ◽  
Vol 518-523 ◽  
pp. 1278-1281
Author(s):  
Rong Jun Su
Keyword(s):  
Coal Mine ◽  
Prediction Models ◽  
Point Of View ◽  
Ground Subsidence ◽  
Land Occupation ◽  
Surface Movement ◽  
Biomass Loss ◽  
Movement And Deformation ◽  
Regional Landscape ◽  
Technical Features

To asses entironmental feasibility of Expanding and Improving Project on Xihe Coal Mine (EIPXCM) and predict it’s influence on entironment, according to related regulations and technical features of the project, prediction models and parameters of surface movement and deformation were determined. Its influence evaluation was down. The results shows that the largest value of ground subsidence in whole mine field is 1.219 m, and corresponding affected scope of surface movement and deformation is 42673 m2. Then the appraisals of entironmental impact on land sink, soil erosion, land occupation, biomass loss, wild animals and landscape ecology were done. The results indicates that only a little land occupied, there will not be big change on regional landscape situation and the project will affect ecosystem very little. Finally, relieving measures of entironmental influence were proponed. Therefore, on the conditions of taking proponed measures, this project is feasible from the point of view of entironment.

Research on Surface Deformation with Increasing Mine Depth

2011 ◽  
Vol 243-249 ◽  
pp. 5890-5893
Author(s):  
Gang Chen ◽  
Qiong Wang
Keyword(s):  
Surface Deformation ◽  
Large Range ◽  
Reference Value ◽  
Mining Area ◽  
Deep Mining ◽  
Mining Depth ◽  
Practical Engineering ◽  
Original Rock ◽  
Mine Depth ◽  
The Relationship

After ore mined, the equilibrium state of original rock stress around mining area is damaged, causing surface deforming at large range. With the increasing resource needing and mining intensity, the mines all over the world are gradually in a stage of deep mining, so it is important to study the principle of surface deformation under the condition of deep mining. Finite element method is used to simulate mine process with increasing depth, and the relationship between mining depth and surface deformation is achieved. The result has important reference value to practical engineering.

scholarly journals The Formation Mechanism of Surface Landslide Disasters in the Mining Area under Different Slope Angles

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Chi Mu ◽  
Xueyi Yu ◽  
Bingchao Zhao ◽  
Dongdong Zhang ◽  
Xuwei Mao ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Formation Mechanism ◽  
Slope Angle ◽  
Mining Area ◽  
Rock Stratum ◽  
Effective Prevention ◽  
Surface Movement ◽  
Working Face ◽  
Geological Conditions ◽  
Movement And Deformation

Slope stability analysis is important for the safe mining of mineral resources. The collapse of goafs in loess gullies can lead to natural disasters such as surface landslides. In this context, this study analyzes monitoring data obtained from surface observation in the Shendong mining area of the Hanjiawan coal mine based on the geological conditions therein. The monitoring results show that the working face experiences a starting period, an active period, and a declining period, from the start of mining to the end of the working face. At the initial mining stage, there is no evident surface movement or deformation in the mining area. When the advance distance of the 12106 working face is between 13 m and 109 m, the surface movement and deformation vary significantly, and the maximum subsidence reaches 1963 mm, which is enough to cause landslides. We select the physical and mechanical parameters of the rock and soil in the mine and then simulate the formation mechanism of surface landslides under different slope angles of the mining area using FLAC3D software. Because of the collapse of the mined-out area, the overlying strata structure is destroyed, the subsidence basin is shifted to the center as a whole, and the slope mass is subjected to tensile and compression deformation, resulting in plastic damage, which develops downward along the crack and leads to a collapse because of the discontinuous movement and deformation of the surface; moreover, step-type ground fissures are produced. The results also show that when the slope angle is greater than 60°, the displacement of the slope mass is not uniform, and the rock stratum in a position with large displacement loses its support, leading to landslides; when the slope angle is less than 30°, the bedrock surface forms a sliding surface and develops to the surface, thus decreasing the possibility of landslides. Based on the stability analysis of the collapsed slope in the goaf of the loess gully, a scientific basis is provided for the effective prevention and control of geological disasters in the Shendong mining area.

scholarly journals Case Study of the Characteristics and Mechanism of Rock Burst near Fault in Yima Coalfield, China

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Zhenhua Jiao ◽  
Qiupeng Yuan ◽  
Peng Zou ◽  
Benjun Shi
Keyword(s):  
Rock Burst ◽  
Impact Damage ◽  
High Stress ◽  
Mining Area ◽  
Deep Mining ◽  
High Stress Concentration ◽  
Near Fault ◽  
Mining Depth ◽  
Time Space ◽  
Deep Rock

Deep mining near faults may easily cause rock bursts, which seriously threaten mining safety. Based on the engineering background of deep mining near fault in Yima coalfield, by collecting the rock burst events that happened near fault during deep mining, the correlation between fault structure and time-space features of rock burst was analyzed. The results show that the deep rock burst accounts for 84% in Yima coalfield at 600 m and 93% in the mining area within 1000 m from F16 fault. The risk of rock burst is positively correlated with mining depth and negatively correlated with the distance between mining area and F16 fault, and the frequency and intensity of rock burst near F16 fault increase significantly. Rock burst occurs in high stress concentration area, mainly in roadway, releasing energy level of 1.1 × 104 J–3.5 × 108 J, with impact damage range of 60–500 m. The mechanism of rock burst was explained from the view of the distribution of mining stress in surrounding rock. The stress of coal seam in deep mining near fault increases, and the disturbance effect of fault is obvious. Rock burst is easy to be induced under static and dynamic loads. The occurrence and mechanical characteristics of fault have different effects on rock burst and should be considered when evaluating the risk of rock burst.

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.

scholarly journals Numerical Simulation Study of the Strata Movement Rule of Deep Mining with the Super-Thick and Weak Cementation Overburden: A Case Study in China

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Guojian Zhang ◽  
Guangli Guo ◽  
Shikai Shen ◽  
Qingkun Guo ◽  
Sifeng Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Eastern China ◽  
Critical Role ◽  
Mining Area ◽  
Central China ◽  
Maximum Difference ◽  
Surface Movement ◽  
Strata Movement ◽  
Coal Resources

As the national energy strategy is to mine westward, the deep coal resources under the super-thick and weak cementation overburden in the western mining area will play a critical role in China’s sustainable economic growth. The super-thick and weak cementation overburden has weaker lithology, thicker strata, no large joints, bedding development, and better integrity. Therefore, its movement rule is inevitably different from that of the weak overburden and the middle hard overburden in Central China and Eastern China. However, lack of studies on the movement of the super-thick and weak cementation overburden has led to severe constraints for the large-scale exploitation of coal resources under the super-thick and weak cementation overburden in the western mining area. This study explored the surface movement rule and the influence of overburden characteristics on strata movement with field measurement and numerical simulation. The findings indicate that the surface reaches full mining and the subsidence coefficient is about 0.9 when D1 (width in the dip direction) and D3 (length in the strike direction) are 3 times H0 (the mean mining depth) or more. The strike mining degree has a certain influence on the surface movement law, the maximum difference of the surface subsidence coefficient is 0.35, and the maximum difference of the horizontal movement coefficient is 0.05. In addition, the control effect of the Zhidan group sandstone is stronger. Thus, its first breaking results in surface sinking in a fractured manner when D1 is about 1.3 times H0 and D3 is 3 times H0 or more. The above results can provide reference for the safe mining and control of the super-thick weak cementation overburden.

scholarly journals Investigation of the Optimization of Unloading Mining Scheme in Large Deep Deposit Based on Vague Set Theory and Its Application

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jia Sheng ◽  
Wen Wan ◽  
Dongrui Liu ◽  
Feifei Jiang ◽  
Xiangdong Li ◽  
...  
Keyword(s):  
Set Theory ◽  
Large Scale ◽  
High Stress ◽  
Mining Area ◽  
Technical Problems ◽  
Deep Mining ◽  
Vague Set ◽  
Mining Depth ◽  
Metal Mines ◽  
Selection Of

With the development of shallow surface mineral resources in metal mines, it is gradually turning to the stage of deep mining. According to the current mining depth and the average annual depth, during the period of “14th Five-Year Plan,” one-third of the underground metal mines will reach or exceed the mining depth of 1,000 m, with the deepest being 2,000 m. In the stage of deep mining, mines will face the conditions of high stress, high temperature, high well depth, and strong mining disturbance, which will greatly increase the difficulty of large-scale deep mining. Among them, the high ground stress environment is the principal problem of many technical problems in deep mining. The selection of mining method has become a prerequisite for solving the problem of efficient and safe mining of deep deposits. In this paper, the vague set theory was introduced into the selection of mining methods and a vague set model for deep unloading mining schemes was established. Taking the Jinchuan No. 2 mining area as the engineering background, four unloading schemes for deep mining were proposed, and the Vague set model was used for optimization. It is concluded that the mining approach with large-section unloading is the optimal unloading mining plan. The application shows that it has the advantages of high unloading efficiency, large production capacity, and low loss index. It has been fully promoted in the deep mining of the mining area. It is feasible and effective to use the vague set theory in the selection of deep unloading mining schemes, which provides a proper approach in the selection of deep unloading mining schemes.

The Characteristics of Collapse Columns in Duanwang Minefield and their Influences on Gas Emission Quantities of Coal Faces

2013 ◽  
Vol 634-638 ◽  
pp. 3537-3540
Author(s):  
Xin Xian Zhai ◽  
Xiao Ju Li ◽  
Yan Wei Zhai
Keyword(s):  
Coal Mine ◽  
Production Capacity ◽  
Mining Area ◽  
Mine Safety ◽  
Shanxi Province ◽  
Free Form ◽  
Karst Collapse ◽  
Coal Face ◽  
Gas Emission ◽  
Mining Depth

Duanwang Coal Mine is located at north of Qinshui coalfield in Shanxi province, China, which gently inclined and thick seams have been mined. Authorized production capacity of the coal mine is 1.8Mt/a. With the increase of mining depth, the mine gas emission quantity increased. Karst collapse columns are very developed in the minefield, and the phenomenon of abnormal gas emission always occurred at the coal face and driving gateway around the collapse columns, then the mine became high gassy one from low gassy mine. Using field measurement and theoretical analysis methods, the following conclusion can be drawn. Karst collapse columns have significant influences on gas emission of the coal face and driving gateway. Here are large amount of free form gas into and around the collapse columns, the collapse columns were disclosure while driving gateway, a large amount of the free gas into collapse column would be instantly released, which caused abnormal gas emission at driving gateway, even leading to gas density exceeding limitation by Coal Mine Safety Regulation of China. However, during mining area of the collapse columns, gas emission quantity at coal face was relatively smaller.

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