Pier-column backfill mining technology for controlling surface subsidence

Backfill mining is an important technology of surface subsidence control and green mining. This paper analyzes the application condition and filling effect of waste rock gravity backfill mining, it also introduces a new waste rock gravity backfill mining technology which utilizes belt loader to transport waste rock to goaf. Belt loader waste rock gravity backfill mining can consume waste rock and achieve environmental protection, it also has the advantages of low filling cost, simple filling system, low labor intensity and safety, etc, so it can be promoted and applied in collieries widely.

Download Full-text

Current Situation and Prospect of Coal Backfill Mining Technology

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.524-527.421 ◽

2012 ◽

Vol 524-527 ◽

pp. 421-425 ◽

Cited By ~ 1

Author(s):

Wen Yu Lv ◽

Zhi Hui Zhang

Keyword(s):

Mining Method ◽

Abscission Layer ◽

Mining Technology ◽

Backfill Mining ◽

Paste Backfill ◽

Rock Movement ◽

Mining Capacity ◽

Mining Design

This paper introduces the classification of the coal backfill mining method and analyzes current technology statuses of several coal backfill mining technologies: waste backfill mining technology, paste backfill mining technology and abscission layer grouting backfill mining technology. Based on the analysis of current backfill mining technology statuses, this paper puts forth that the backfill mining technology should focus on the problem of the lack of coal backfill mining capacity, research on the role of backfill mining rock movement needing to be strengthened, filling efficiency and economy needed to improved through reasonable optimization of backfill mining parameter, so it can provide the theoretical basis for backfill mining design.

Download Full-text

Constitutive Model of Solid Backfill Materials and Numerical Simulation of Overburden Movement and Deformation in Backfill Mining

Shock and Vibration ◽

10.1155/2021/6619532 ◽

2021 ◽

Vol 2021 ◽

pp. 1-14

Author(s):

Chao Ma ◽

Lianying Zhang ◽

Bing Li ◽

Xianbiao Mao

Keyword(s):

Constitutive Model ◽

Surface Subsidence ◽

Compaction Process ◽

Compaction Rate ◽

Key Strata ◽

Mining Depth ◽

Backfill Mining ◽

Backfill Materials ◽

Initial Compaction ◽

Mining Height

Solid backfill mining is an efficient and environmental-friendly coal mining technology, which can effectively solve the problems of coal gangue pollution, water resource loss, and surface subsidence. Based on the mechanical behavior of backfill materials in the compaction process, volume strain was used to express the deformation modulus, and a constitutive model of backfill materials was proposed in this study. The ABAQUS UMAT was used to develop the numerical calculation subroutine of the model. Finally, the rationality of the model was verified that simulated stress-strain curves of the backfill materials during the compaction process agree well with experiments. Based on the proposed constitutive model, the influence of three factors (the initial compaction rate of the filling body, the mining height, and the mining depth) on the key strata and surface subsidence was analyzed systematically. The results show that the initial compaction rate and the height of coal seams have significant influences on surface subsidence. When the thickness of topsoil is only changed and the structural composition and lithology of overburden are not changed, the mining depth has little influence on surface subsidence, but a significant influence on surface subsidence range. The influence of mining height and mining depth on the deformation of key strata of overburden and surface subsidence is approximately linear, while the influence of the initial compaction rate is nonlinear.

Download Full-text

A Method of Backfill Mining Crossing the Interchange Bridge and Application of a Ground Subsidence Prediction Model

Minerals ◽

10.3390/min11090945 ◽

2021 ◽

Vol 11 (9) ◽

pp. 945

Author(s):

Shuaigang Liu ◽

Jianbiao Bai ◽

Gongyuan Wang ◽

Xiangyu Wang ◽

Bowen Wu

Keyword(s):

Prediction Model ◽

Dynamic Change ◽

Simulation Software ◽

Surface Subsidence ◽

Ground Subsidence ◽

Mining Method ◽

Subsidence Prediction ◽

Probability Integral Method ◽

Backfill Mining ◽

Step Distance

The traditional backfill mining method is a technology developed by the general trend of green coal mining, but with a high cost and an impact on production efficiency. This paper proposes a structured backfill mining method with high-water materials and pillars. The evolution of roof pressure appearance is assessed through the sensor and monitoring system in the hydraulic support. The main roof fracture step distance is determined based on the roof structure characteristics of backfill mining, and the backfill step distance of underground structural backfill is 22.7 m considering the safety factor. Through the simulation results of Abaqus commercial simulation software, the roof subsidence evolution of different backfill schemes under temporary load and permanent load is compared, and the rationality of the backfill step distance is verified. Based on the probability integral method, the surface subsidence prediction model is proposed, then the final value and the maximum dynamic change value of the surface subsidence at the north and south ends of the interchange bridge by traditional mining and backfill mining are analyzed, which verifies the rationality of the structural backfill mining method.

Download Full-text

A New Thin Seam Backfill Mining Technology and Its Application

Energies ◽

10.3390/en10122023 ◽

2017 ◽

Vol 10 (12) ◽

pp. 2023 ◽

Cited By ~ 5

Author(s):

Hengjie Luan ◽

Yujing Jiang ◽

Huili Lin ◽

Yahua Wang

Keyword(s):

Mining Technology ◽

Backfill Mining ◽

Thin Seam

Download Full-text

The Application Research on Backfill Mining Technology of Gangue for Coal Pillar Mining in Xingtai Mining Village

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.156-157.225 ◽

2010 ◽

Vol 156-157 ◽

pp. 225-231 ◽

Cited By ~ 2

Author(s):

Li Ma ◽

Zi Wei Ding

Keyword(s):

Fly Ash ◽

Coal Pillar ◽

Maximum Level ◽

Application Research ◽

Feed System ◽

Mining Technology ◽

Hydraulic Mining ◽

Backfill Mining ◽

The Face ◽

Pillar Mining

Gangue and fly ash combined mining technology is the direct filling of the gangue and fly ash to the surface by the feed delivered to the face well, and then filling is in gob areas, while ensuring under the premise of the safe use of surface buildings subjects to the normal maximum level for achieving Coal Mining under the buildings. In the paper, gangue and fly ash on the exploitation of the feed system were designed for filling and compaction equipment, the hydraulic mining was developed on the backfill mining, the conveyor was modified, and the gangue and fly ash mining technology were designed. As the result, the filling rate and surface subsidence was controlled effectively, the service life of the mine was extended, and the good economic and social benefits were achieved.

Download Full-text

Study on Deformation of Tunnel with Underlying Coal Mining

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.105-107.1295 ◽

2011 ◽

Vol 105-107 ◽

pp. 1295-1298

Author(s):

Zhi Gang Yan

Keyword(s):

Numerical Simulation ◽

Coal Seam ◽

Coal Mining ◽

Calculation Method ◽

Surface Subsidence ◽

Mining Technology ◽

Deformation Law ◽

Coal Block ◽

Dip Angle ◽

Seam Mining

Coal mining can cause the strata distortion and surface subsidence. With infrastructure construction scale in our country enlargement, the case of approaching excavation caused by coal mining is increasing and more complicated. The calculation method of current regulations is too simple and don't conform to the present coal mining technology, so it will cause serious waste of resources. By using numerical simulation, this paper regards the influence of coal mining on the above tunnel as approaching excavation problem and studies the tunnel deformation law with three different coal mining mode. Based on the analysis and calculation, this paper proposes measures to ensure that the coal seam mining and tunnel's safety. The result indicates the more smaller the dip angle of coal block the more larger the displacement and the deformation range of tunnel. The most effective method for decrease deformation is the backfill method. If the conditions are permitted, backfill method is the preferred method and longwall caving method is last.

Download Full-text

Implementation of Paste Backfill Mining Technology in Chinese Coal Mines

The Scientific World JOURNAL ◽

10.1155/2014/821025 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 11

Author(s):

Qingliang Chang ◽

Jianhang Chen ◽

Huaqiang Zhou ◽

Jianbiao Bai

Keyword(s):

Coal Mining ◽

Underground Mining ◽

Coal Mines ◽

Practical Implementation ◽

Widespread Application ◽

Mining Technology ◽

Backfill Mining ◽

Paste Backfill ◽

Chinese Coal ◽

Specific Implementation

Implementation of clean mining technology at coal mines is crucial to protect the environment and maintain balance among energy resources, consumption, and ecology. After reviewing present coal clean mining technology, we introduce the technology principles and technological process of paste backfill mining in coal mines and discuss the components and features of backfill materials, the constitution of the backfill system, and the backfill process. Specific implementation of this technology and its application are analyzed for paste backfill mining in Daizhuang Coal Mine; a practical implementation shows that paste backfill mining can improve the safety and excavation rate of coal mining, which can effectively resolve surface subsidence problems caused by underground mining activities, by utilizing solid waste such as coal gangues as a resource. Therefore, paste backfill mining is an effective clean coal mining technology, which has widespread application.

Download Full-text

Surface Subsidence Control during Deep Backfill Coal Mining: A Case Study

Advances in Civil Engineering ◽

10.1155/2020/6876453 ◽

2020 ◽

Vol 2020 ◽

pp. 1-12

Author(s):

Baiyi Li ◽

Nan Zhou ◽

Wenyue Qi ◽

Ailing Li ◽

Zhizhong Cui

Keyword(s):

Coal Mining ◽

Mining Area ◽

Filling Ratio ◽

Surface Subsidence ◽

Integral Model ◽

Resource Exploitation ◽

Machine Material ◽

Deep Mining ◽

Backfill Mining ◽

Surface Subsidence Control

Deep resource exploitation is imperative, but it is facing with more complicated mining environment and more dangerous mining disturbances to induce the potential catastrophe process. Solid backfill technology, which can control the strata movement and prevent potential hazards, has been used as the primary method in deep mining for surface subsidence control and ecosystem protection. In this study, taking backfill mining area no. 930 in the Tangkou coal mine as background, the probability integral model was adopted to predict the surface subsidence at different mining depths and filling ratios. The filling ratio was designed for deep mining based on the regression analysis of the predicted surface subsidence results. The study shows that the backfilling ratio at the Tangkou deep coal mining area should be controlled at a level greater than 82.5%, and the mining damage to the surface under this condition was analyzed. Furthermore, control strategies for deep backfill mining are proposed in which the backfill density can be enhanced by optimizing the tamping machine, material composition, and tamping process. Finally, the measurement of the backfill mass and surface subsidence showed that the actual filling ratio was controlled at 82.57%, which ensures adequate protection of the surface buildings during the mining process.

Download Full-text