scholarly journals Coalmine Green Mining with Gangue Backfilling Technique

2011 ◽  
Vol 10 ◽  
pp. 1205-1209 ◽  
Author(s):  
Yang Guo-liang ◽  
Yang Ren-shu ◽  
Tong Qiang ◽  
Huo Chuan
Keyword(s):  
Gangue Backfilling

scholarly journals Movement Laws of Overlying Strata above a Fully Mechanized Coal Mining Face Backfilled with Gangue: A Case Study in Jiulishan Coal Mine in Henan Province, China

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Zhengkai Yang ◽  
Zhiheng Cheng ◽  
Zhenhua Li ◽  
Chunyuan Li ◽  
Lei Wang ◽  
...  
Keyword(s):  
Coal Mining ◽  
Main Roof ◽  
Surrounding Rock ◽  
Surface Subsidence ◽  
Key Strata ◽  
Key Stratum ◽  
Mining Face ◽  
Failure Depth ◽  
Gangue Backfilling ◽  
Overlying Strata

The aim of this study is to obtain movement laws of overlying strata above a fully mechanized coal mining face backfilled with gangue and solve the problem of surface subsidence during coal mining. This study was carried out based on gangue backfilling mining of Jiulishan Coal Mine (Jiaozuo City, Henan Province, China) from the perspectives of deformation of backfilled gangue under compaction, surrounding rock of a stope, and activities of key strata. The method combining with rock mechanics, viscoelastic mechanics, control theory of rock mass under mining, and numerical simulation was used based on physical and mechanical characteristics of backfilled gangue. On this basis, the research analyzed the temporal-spatial relationships of activities of surrounding rock of the stope, compressive deformation of backfilling body, failure depth of the floor, deformation characteristics of the main roof with laws of surface subsidence. The movement characteristics of overlying strata above the fully mechanized coal mining face backfilled with gangue and the traditional fully mechanized mining face were compared. It is found that, under the same conditions of overlying strata, movement laws of overlying strata are mainly determined by the mining height of coal seams and the heights of a caving zone and a fracture zone are nearly linearly correlated with the mining height. Through analysis based on thin-plate theory and key stratum theory, the location of the main roof of the fully mechanized coal mining face backfilled with gangue in coal seams first bending and sinking due to load of overlying strata was ascertained. Then, it was determined that there are two key strata and the main roof belongs to the inferior key stratum. By using the established mechanical model for the main roof of the fully mechanized coal mining face backfilled with gangue and the calculation formula for the maximum deflection of the main roof, this research presented the conditions for breaking of the main roof. In addition, based on the theoretical analysis, it is concluded that the main roof of the fully mechanized coal mining face backfilled with gangue does not break, but bends. The numerical simulation results demonstrate that, with the continuous increase of strength of backfilled gangue, the stress concentration degree of surrounding rock reduces constantly, so does its decrease amplitude. Moreover, the compressive deformation of backfilling, failure depth of the floor, and bending and subsidence of the main roof continuously decrease and tend to be stable. The mechanical properties of backfilling materials determine effects of gangue backfilling in controlling surface subsidence. Gangue backfilling can effectively control movement of overlying strata and surface subsidence tends to be stable with the increase of elastic modulus of gangue.

Coupling mechanism of roof and supporting wall in gob-side entry retaining in fully-mechanized mining with gangue backfilling

2011 ◽  
Vol 21 (6) ◽  
pp. 829-833 ◽  
Author(s):  
Zhanguo Ma ◽  
Peng Gong ◽  
Jinquan Fan ◽  
Minmin Geng ◽  
Guowei Zhang
Keyword(s):  
Coupling Mechanism ◽  
Gangue Backfilling

scholarly journals Similar material and numerical simulation of strata movement laws with long wall fully mechanized gangue backfilling

2009 ◽  
Vol 1 (1) ◽  
pp. 1089-1094 ◽  
Author(s):  
Guo Guang-li ◽  
Zha Jian-feng ◽  
Miao Xie-xing ◽  
Wang Qiang ◽  
Zhang Xian-ni
Keyword(s):  
Numerical Simulation ◽  
Similar Material ◽  
Strata Movement ◽  
Gangue Backfilling

scholarly journals The mining pressure in mixed workface using a gangue backfilling and caving method

2018 ◽  
Vol 16 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Yang Tai ◽  
Xiaole Han ◽  
Peng Huang ◽  
Baifu An
Keyword(s):  
Mining Pressure ◽  
Gangue Backfilling

scholarly journals Surface Subsidence Control Mechanism and Effect Evaluation of Gangue-Backfilling Mining: A Case Study in China

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Huaizhan Li ◽  
Guangli Guo
Keyword(s):  
Surface Deformation ◽  
Material Model ◽  
Simulation Method ◽  
Surface Subsidence ◽  
Deformation Characteristics ◽  
Resource Exploitation ◽  
Similar Material ◽  
Surface Subsidence Control ◽  
Gangue Backfilling ◽  
Overlying Strata

Comprehensive mechanization solid backfilling mining is a new technology developed in China for coal mining and surface subsidence control. Based on a gangue-backfilling project in the Yangzhuang Coal Mine, the characteristics of underlying strata and surface deformation were studied by similar-material simulation method. When the ratio of the sponge to foam was 1 : 3, the mixture can simulate well the deformation characteristics of gangues in the similar-material model. On this basis, the movement and deformation characteristics of the overlying strata caused by gangue-backfilling mining were studied. The findings indicate that compared with caving mining, the expansion coefficient of overlying strata, the interlayer fracture, and the subsidence value were smaller in backfilling mining, with the integral overlying strata subsidence occurring. Meanwhile, the reduction ratio of surface subsidence after backfilling mining was more than 85%, verified by the subsidence-monitoring results. The research outcomes in this paper have significance for coal resource exploitation of similar mines around the world.

scholarly journals An Innovative Method for Placement of Gangue Backfilling Material in Steep Underground Coal Mines

Minerals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 107 ◽  
Author(s):  
Yanchun Yin ◽  
Tongbin Zhao ◽  
Yubao Zhang ◽  
Yunliang Tan ◽  
Yue Qiu ◽  
...  
Keyword(s):  
Coal Seam ◽  
Large Scale ◽  
Small Scale ◽  
Underground Coal Mining ◽  
Long Distance ◽  
Subsidence Area ◽  
Working Face ◽  
Underground Coal Mines ◽  
Gob Area ◽  
Gangue Backfilling

Using gangue backfilling in underground coal mining not only controls the roof deformation in the gob area but also reduces the amount of mining waste rock. However, due to the limitations of the complicated engineering conditions, backfilling mining in the steep coal seam is not widely applied. In this study, a long-distance backfilling technology with a scraper winch for a steep coal seam was proposed and applied in a flexible shield supporting working face in Datai Mine, Beijing. Aiming at the problem of the decreasing backfilling ratio in field practice, numerical simulation was carried out to research the moving law of gangue in the goaf. The gangue mainly experienced four stages: gangue landslide stage, small-scale subsidence stage, funnel-shaped subsidence stage, and large-scale subsidence stage. The moving area of the gangue could be divided into five areas including a motionless area, a landslide area, a subsidence area, a funnel-shaped subsidence area, and a to-be-backfilled area. With the increase of the inclined length of the working face, the moving time of the gangue increased gradually. Based on the simulation results, the scheme of backfilling and mining in Datai Mine was optimized, for which the inclined length of the working face was shortened, and a higher backfilling ratio was obtained.

scholarly journals An Experimental Investigation on the Mechanical Properties of Gangue Concrete as a Roadside Support Body Material for Backfilling Gob-Side Entry Retaining

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Peng Gong ◽  
Zhanguo Ma ◽  
Xiaoyan Ni ◽  
Ray Ruichong Zhang
Keyword(s):  
Compressive Strength ◽  
Carrying Capacity ◽  
Waste Utilization ◽  
Experimental Results ◽  
Utilization Rate ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Low Costs ◽  
Application Requirements ◽  
Gangue Backfilling

Development of a safe and economical roadside support body (RSB) material is the key to successful backfilling gob-side entry retaining (GER). By means of laboratory tests, this paper studied the effects of the water-cement ratio, aggregate content, and age on the contractibility and resistance increasing speed, compressive strength, and postpeak carrying capacity of the concrete with gangues as an aggregate. It also discussed the rationality and adaptability of gangue concrete as a RSB material for backfilling GER. The experimental results show that the compressive strength of gangue concrete increases with age, and that the strength of gangue concrete demonstrates a nonlinear decreasing trend with the increase of the cementing material’s water-cement ratio. The water-cement ratio in the range of 0.46–0.60 has the most significant regulation effect on the strength of gangue concrete. Mixing with a certain amount of coal gangue enhances the postpeak carrying capacity of concrete, preventing the sample from impact failure. The field experimental results report that as a RSB material, gangue concrete can meet the design and application requirements of GER with gangue backfilling mining. A RSB material featuring high safety, high waste utilization rate, fast construction speed, and low costs is provided.

scholarly journals Experimental Study on Gangue Backfilling Materials Improved by Soda Residue and Field Measurement of Surface Subsidence

2021 ◽  
Vol 9 ◽  
Author(s):  
Wei Yin ◽  
Kun Zhang ◽  
Shenyang Ouyang ◽  
Xiaomin Bai ◽  
Wenjie Sun ◽  
...  
Keyword(s):  
Solid Waste ◽  
Reference Group ◽  
Surface Subsidence ◽  
Hydration Reaction ◽  
Control Effect ◽  
Bleeding Rate ◽  
Working Face ◽  
Slurry System ◽  
Early Strength ◽  
Gangue Backfilling

In coal mining, the problems of massive discharge of solid waste, environmental pollution, and surface subsidence disaster are urgent to be solved. Based on this engineering background, the feasibility of using solid waste soda residue to improve gangue cemented backfilling material was discussed, and the surface subsidence of the test working face was measured in this study. Besides, the influence of soda residue on the performance of gangue cemented backfilling materials was analyzed through laboratory tests. The experimental results show that 1) as the content of soda residue increases within the range of 0–12%, the slump of the soda residue gangue backfilling material (SRGBM) slurry gradually increases, and the bleeding rate increases. The early strength and later strength of SRGBM increase first and then decrease with the increase in soda residue content. 2) The optimal ratio of the soda residue cemented backfilling material is soda residue: fly ash: lime: cement: gangue = 6%: 34%: 10%: 2.5%: 47.5%. Compared with the reference group, the slump of the material is increased by 12.7%, the bleeding rate is only 3.8%, and the early strength and later strength are increased by 449 and 187%, respectively. 3) The addition of soda residue promotes the hydration reaction of the slurry system of soda residue cemented materials. The coexistence of C-S-H gel and N-A-S-H gel reduces the connectivity of pores and improves the strength of the material. 4) The maximum surface subsidence of the test working face is only 245 mm, and the surface subsidence control effect is good. Therefore, the preparation of SRGBM with soda residue can achieve energy saving and emission reduction, with significant technical, economic, and social benefits, and has good promotion and application value.

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