Numerical simulation of roof movement and fill strength of coal deep mining

Li, Tao; Yang, Bo; Zheng, Qi; Gu, Chengjin; Shan, Qiyuan; Chen, Weixin

doi:10.1007/s12517-021-07004-7

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…The conventional methods used in the previous studies for the simulation of meso-structural evolution included mesh-based methods and meshfree methods. As two common mesh-based methods, Finite Difference Method (FDM) and Finite Element Method (FEM) were often used in the simulation of meso-structural evolution [20,21], but the disadvantage of mesh distortion was difficult to solve when large material deformation occurred. Different from mesh-based methods, rock was regarded as a discontinuous medium in the discrete particle methods, such as the Discrete Element Method (DEM) [22][23][24][25], but it was computationally expensive and possibly failed for large-scale models.…”

Section: Introductionmentioning

confidence: 99%

Study on Meso-Structural Evolution of Bedrock Beneath Offshore Wind Turbine Foundation in Pressurized Seawater

Zhang,

Lin

et al. 2023

JMSE

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In recent years, offshore wind turbine technology has been widely developed, making a significant contribution to the advancement of renewable energy. Due to the predominant subsurface geological composition characterized by rocky formations in some marine areas, rock-socketed piles are commonly applied as offshore wind turbine foundations. Generally, rock-socketed piles need to be driven into rock layers that have not undergone significant weathering or erosion for optimal load-bearing capacity. This design is essential to ensure structural support for offshore wind turbines. However, during the long-term operation period of offshore wind turbines, the contact surface between the rock-socketed pile and the rock is prone to be detached under multiple dynamic loads. The generated channel makes seawater seep into the unweathered rock layer, resulting in the erosion of rock meso-structure and deterioration of mechanical properties. The reduced load-bearing capacity will adversely affect the operation of the offshore wind turbine. In this study, the meso-structural evolution of bedrock in pressurized seawater is investigated by X-ray CT imaging using tuff samples from the marine areas of an offshore wind farm in China. A cellular automata model is proposed to predict the long-term evolutionary process of tuff meso-structure. Results indicate that the porosity of the tuff sample in the pressurized seawater shows an upward trend over time. Based on the erosion rate of pores obtained from the CT scanning test, the proposed cellular automata model can predict the evolutionary process of tuff meso-structure and corresponding failure strength of the bedrock in the long term.

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Section: Introductionmentioning

confidence: 99%

Study on Meso-Structural Evolution of Bedrock Beneath Offshore Wind Turbine Foundation in Pressurized Seawater

Zhang,

Lin

et al. 2023

JMSE

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“…With the increasing proportion of complex coal seams [1][2][3][4], the efficiency of traditional mechanical coal mining methods is getting lower. Since most of the complex coal seams are harder, it is difficult to achieve good results by increasing the size or power of the cutting mechanism under such conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on Crushing Properties of Hard Coal Using Impacting-Cutting Technique

Zhang

Wang

Tian

2022

Shock and Vibration

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The reserves of high-quality coal seams have been greatly reduced in recent years, and the low efficiency of traditional cutting methods in hard coal seams has become a problem for the coal production industry. In order to improve the mining efficiency, an impacting-cutting technique was proposed in this study. A drum modification model with picks impact function was established, and crushing properties of the impacting-cutting drum at f4, f5, and f6 coal hardness were simulated using the discrete element method. The simulation results show that the impacting-cutting drum has higher coal crushing efficiency, lower drum force, and more stable cutting processes than the traditional drum. It shows that hard coal might be effectively reduced by the impacting-cutting technique to reduce the difficulty of mining, and reflected the applicability in hard coal seams. Meanwhile, a simplified test device for the impacting-cutting technique was designed. And the actual coal crushing performance was tested. The test results show that the force of the cutting mechanism in the impact mode is lower than that of the nonimpact mode, and the force is more stable. It proves that the impacting-cutting technique has a higher applicability of hard coal seams than the traditional technique.

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“…Energy and mineral resources are important factors restricting the national economic development of all countries in the world; with the reduction and depletion of shallow resources, the mining depth of coal all over the world is increasing year by year [1][2][3]. At present, the mining depth of coal mines in China is increasing at the rate of 8~12 m per year; the eastern mine develops at the rate of 100~250 m every ten years; it is estimated that in the next twenty years, many coal mines will enter a depth of 1000~1500 m. With the excavation and construction of underground space entering the deep mining, geological environment has become more complex; it makes the rock mechanics of deep underground engineering become the focus of international research in the field of mining and rock mechanics [4,5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Mine Earthquake Disturbance on the Principal Stress of the Main Roadway near the Goaf and Its Prevention and Control Measures

Guo

Hao

et al. 2021

Geofluids

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With the reduction and depletion of shallow energy, the mining depth of coal around the world is increasing year by year, and the mining depth of some coal mines in China has reached kilometers. The main roadway near the goaf with the deep high static stress is very easy to be damaged after being disturbed by the mine earthquake. Taking the main roadway in the no. 1 mining area of Gaojiapu coal mine in Binchang mining area, Shaanxi Province, China, as the engineering background, the high-energy mine earthquake monitored by the on-site microseism is equivalently simulated through the dynamic module of FLAC3D, and the spatial-temporal rotation characteristics of the principal stress of roadway surrounding rock under the disturbance of mine earthquake are studied and analyzed and put forward corresponding prevention and control measures. Research shows early stage of mine earthquake disturbance, roadway roof is first affected, and the principal stress of the roof has the trend of deflection to the side of the goaf. In the middle stage of mine earthquake disturbance, the main body of roof principal stress deflects to the side of goaf, and the deflection range is large. In the later stage of mine earthquake disturbance, the principal stress directions in the surrounding rock reverse rotation, and the reverse rotation angle of the principal stress direction in the roof is the largest. Finally, the asymmetric distribution characteristics of principal stress rotation are verified by using the asymmetric deformation phenomenon on both sides of roadway surrounding rock. Based on the rotation characteristics of principal stress under the dual influence of mine earthquake disturbance and goaf, optimize the layout scheme and blasting parameters of blasting pressure relief holes. The transmission direction of principal stress can be changed by blasting pressure relief method; meanwhile, the transmission of principal stress can be blocked; through the comparison of microseismic activity law before and after pressure relief, pressure relief effect is good. The research results can provide a certain reference basis for coal mine roadway pressure relief and reducing disaster conditions.

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Numerical simulation of roof movement and fill strength of coal deep mining

Cited by 3 publications

References 11 publications

Study on Meso-Structural Evolution of Bedrock Beneath Offshore Wind Turbine Foundation in Pressurized Seawater

Study on Meso-Structural Evolution of Bedrock Beneath Offshore Wind Turbine Foundation in Pressurized Seawater

Numerical and Experimental Study on Crushing Properties of Hard Coal Using Impacting-Cutting Technique

Influence of Mine Earthquake Disturbance on the Principal Stress of the Main Roadway near the Goaf and Its Prevention and Control Measures

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