scholarly journals Wide Strip Backfill Mining for Surface Subsidence Control and Its Application in Critical Mining Conditions of a Coal Mine

2018 ◽  
Vol 10 (3) ◽  
pp. 700 ◽  
Author(s):  
Wenhao Cao ◽  
Xufeng Wang ◽  
Peng Li ◽  
Dongsheng Zhang ◽  
Chundong Sun ◽  
...  
Keyword(s):  
Coal Mine ◽  
Surface Subsidence ◽  
Wide Strip ◽  
Mining Conditions ◽  
Backfill Mining ◽  
Surface Subsidence Control

Research on the Belt Loader Waste Rock Gravity Backfill Mining Technology

2012 ◽  
Vol 253-255 ◽  
pp. 1036-1039
Author(s):  
Wen Yu Lv ◽  
Zhi Hui Zhang
Keyword(s):  
Environmental Protection ◽  
Surface Subsidence ◽  
Waste Rock ◽  
Labor Intensity ◽  
Mining Technology ◽  
Application Condition ◽  
Filling System ◽  
Backfill Mining ◽  
Surface Subsidence Control

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.

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

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.

The survey on surface subsidence around Xinglongzhuang coal mine based on remote sensing

2013 ◽  
pp. 141-146
Author(s):  
Haiqing Wang ◽  
Xiaohong Wang ◽  
Jinzhong Yang ◽  
Yingjie Zhou ◽  
Jie Wang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Coal Mine ◽  
Surface Subsidence

scholarly journals Surface Subsidence Prediction Method for Coal Mines with Ultrathick and Hard Stratum

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Hongkai Han ◽  
Jialin Xu ◽  
Xiaozhen Wang ◽  
Jianlin Xie ◽  
Yantuan Xing
Keyword(s):  
Coal Mining ◽  
Coal Mine ◽  
Prediction Method ◽  
Prediction Equation ◽  
Arbitrary Cross Section ◽  
Surface Subsidence ◽  
Strong Impact ◽  
Subsidence Prediction ◽  
Movement Characteristics ◽  
Mining Condition

Overburden conditions consisting of ultrathick and hard stratum (UTHS) are widespread in China and other countries, but existing surface subsidence prediction methods ignore the strong impact of UTHS on surface subsidence. They are thus not applicable for surface subsidence prediction for coal mining with the presence of UTHS. We conducted actual measurements of surface and UTHS subsidence in the Tingnan Coal Mine. The results showed that under the UTHS mining condition, the required gob dimension is much larger than the empirical value when the surface reaches sufficient mining and that the actual measured maximum value of surface subsidence is much smaller than the empirical value. The UTHS subsidence is approximately equal to the surface subsidence. The movement of UTHS has a strong impact on surface subsidence and has a controlling function for it. It was proposed that surface subsidence could be approximately predicted by calculating the UTHS subsidence. The UTHS movement characteristics were studied using Winkler’s theory of beams on an elastic foundation, the subsidence prediction equation of the main sections in the strike and dip directions was obtained under different mining dimensions, and the subsidence prediction equation of any arbitrary cross section parallel to the two main sections was established. Then, the surface subsidence prediction method for coal mining with the presence of UTHS was developed, and the influences of UTHS thickness, strength, and layer position on the surface subsidence were discussed. The Tingnan Coal Mine was taken as an example, and the subsidence curves of the strike and dip main sections were calculated using different mining dimensions. Subsequently, the surface subsidence after the mining of working faces 204, 205, 206, and 207, respectively, was predicted, and the prediction method was verified by comparing the results with the measured surface subsidence results of working faces 204, 205, and 206.

scholarly journals Deflection Mechanism and Safety Analysis of Coal Mine Shaft in Deep Soil Strata

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Jihuan Han ◽  
Jiuqun Zou ◽  
Chenchen Hu ◽  
Weihao Yang
Keyword(s):  
Coal Mine ◽  
Rational Design ◽  
Coal Pillar ◽  
Design Parameters ◽  
Deep Soil ◽  
Mine Shaft ◽  
Dynamic Prediction ◽  
Probability Integral Method ◽  
Mining Conditions ◽  
Shaft Deflection

The main shaft and auxiliary shaft in the Guotun Coal Mine underwent large deflections, with deflection values of 359 mm and 322 mm, respectively. These two deflections represent the first occurrence of such large vertical shaft deviations in the soil strata in China. The deflection problem has seriously affected the hoisting safety and lining safety and has become a serious impediment to the sustainable production of mines. Therefore, the deflection mechanism must be determined. For this purpose, based on mining subsidence theory, the spatial probability integral method and a more accurate time function were used to establish a model, called 3D dynamic prediction model, for predicting the shaft movement. The formulas for calculating the lining stress caused by coal mining were based on established models. With measured shaft deflection data, the prediction parameters for deep soil strata were calculated on the basis of an inversion analysis. A comparative analysis of measured and calculated deflection values revealed that the reason for shaft deflection in Guotun Coal Mine is the insufficient size of the protection coal pillar (PCP); namely, the design parameters of the PCP in current codes are not applicable to the deep soil strata. As a result, under the asymmetric mining conditions, mining causes the shaft to deflect without damage and under the symmetric mining conditions, mining causes the lining to fracture. The results have an extremely important significance for the prevention and control of shaft deflection, for the rational design of PCP, and for the sustainability of mine production.

New Technology of Surface Subsidence Control and Environmental Protection Research in Coal Mining Region

2014 ◽  
Vol 675-677 ◽  
pp. 1385-1394
Author(s):  
Cheng Rong Jiang ◽  
Liu Yang ◽  
Hao Xie ◽  
Hua Yi Huang ◽  
De Ke Sun
Keyword(s):  
Coal Mining ◽  
New Technology ◽  
Mining Area ◽  
Industrial Test ◽  
Surface Subsidence ◽  
High Concentration ◽  
Geological Conditions ◽  
Surface Subsidence Control ◽  
Fissure Water ◽  
Overlying Strata

In combination with the geological conditions of Tie'er mining area in Tangshan coal mining, this paper not only analyzes the evolution of overlying strata structure in stope and the development law of overlying strata separation, also proposes a new continuous grouting technology with large flow and high concentration slurry. The industrial test showed that, when the grout-mining ratio of the whole mining area is 25.3%, the reducing subsidence ratio is 51.5%, the effect of reducing the surface subsidence is good. According to the chemical analysis of water quality ingredients of slurry, the test result showed, heavy metals contents in fly-ash slurry water do not exceed the standard, which has no bad effect on the fissure water in the bedrock.

Study on the Structure Model and Controlling Method of Subsidence in Flat Seam and Deep Mining

2006 ◽  
Vol 306-308 ◽  
pp. 1403-1408 ◽  
Author(s):  
Chong Ge Wang ◽  
Wei Zhong Chen ◽  
Liyou Pan
Keyword(s):  
Research Work ◽  
Surface Subsidence ◽  
Deep Mining ◽  
Global Positioning ◽  
Coal Wall ◽  
The Face ◽  
Surface Subsidence Control ◽  
The Common ◽  
And Control ◽  
Overlying Strata

The stratum movement and surface subsidence is considered as a whole system in the research work. The key of the surface subsidence control lies first in having thorough knowledge of the dynamic changeable of the overlaying strata movement as the face advances so as to establish the corresponding structure mechanics subsidence model in flat seam and deep mining. The common characteristic of stratum movement and the development procedure of crack arch are described in this paper. The structure constituents of subsidence and their influencing factors are also analyzed. Meanwhile, the surface subsidence is determined by the compressing of coal wall and the bending of the overlying strata. Based on the ground observation by the global positioning system, the boundary angle and the motion angle are determined. Furthermore, according to the research law, one can predict and control the surface subsidence damages for the special geologic conditions.

scholarly journals Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

2019 ◽  
Vol 11 (7) ◽  
pp. 2118 ◽  
Author(s):  
Qiang Zhang ◽  
Jixiong Zhang ◽  
Zhongya Wu ◽  
Yang Chen
Keyword(s):  
Coal Mining ◽  
Coal Mine ◽  
Surface Subsidence ◽  
Separation Method ◽  
Dense Medium ◽  
Research Progress ◽  
Coal Waste ◽  
Gas Extraction ◽  
Water Separation ◽  
Waste Separation

China is the world’s largest coal producer country. However, large-scale coal mining has led to severe environmental pollution issues such as surface subsidence and gangue piling up. The gangue discharging amount has ranked the first in the world and coal mine enterprises are facing enormous discharging reduction pressure. This paper summarizes the research progress of the solid backfilling mining technology and then illustrates the realistic demands and significance of implementing underground coal-waste separation. It also focuses on the technical principles, systems and key equipment of the common underground coal-waste separation methods, such as the selective crushing method, the dense medium shallow groove method, the vibro-assisted jigging method and full-size water separation method and ray identification method. In addition, the selection steps of underground coal-waste separation method, the design process of large section separation chamber and the design principle of separation and backfilling system are proposed, finally, the mining-separating-backfilling + X for coal mining is put forward. By combining the technology of mining-separating-backfilling with other technologies, such as gob-side entry retaining with non-pillar mining, gas extraction, solid waste treatment, water protection mining, mining under buildings, railways and water bodies, the integrated mining methods, mining-separating-backfilling + setting pillars, gas drainage, treatment, protection and prevention methods are formed. It also introduced the ‘mining-separating-backfilling + gas extraction’ technology’s whole idea, system arrangement, separation equipment and practical engineering application effects based on the specific engineering case of pingmei no. 12 coal mine. The results indicate that the integration of underground coal-waste separation and solid backfilling technology could achieve gangue discharging reduction, underground washing and surface subsidence control. It is effective at realizing green mining.

Study on Predictin of Surface Subsidence of an Exremely Shallow Large-Span Double-Arch Tunnel

2011 ◽  
Vol 396-398 ◽  
pp. 2245-2248
Author(s):  
Xin Zhi Li ◽  
Shu Cai Li ◽  
Shu Chen Li ◽  
Xian Da Feng ◽  
Chao Yuan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Surface Subsidence ◽  
Tunnel Construction ◽  
Geomechanical Model ◽  
Large Span ◽  
Geomechanical Model Test ◽  
Construction Methods ◽  
Surface Subsidence Control ◽  
Great Wall

The Qi-Great Wall tunnel which crossed the Qi -Great Wall ruins was a large span double-arch tunnel with two-way and six-lane and the maximum depth was less than 5 meters, in order to protect the safety of thr surface ruins in the tunnel construction progress, surface subsidence control was particularly important. Through comprehensive geomechanical model test and numerical simulation , the surface subsidence wich generated in the process of construction according to construction methods of excavation and support was studied, the distribution of surface subsidence got through two methods was fitted well,and research results could provide guidance for the construction.

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