Prediction of rockbursts in a typical island working face of a coal mine through microseismic monitoring technology

Zhang, Chao; Jin, Gaohan; Liu, Chao; Li, Shugang; Xue, Jianyang; Cheng, Renhui; Wang, Xinglong; Zeng, Xiangzhen

doi:10.1016/j.tust.2021.103972

Cited by 47 publications

(18 citation statements)

References 53 publications

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“…In the process of underground coal resource recovery, the retrieval of the working face disrupts the original stress balance of the surrounding rock, and the redistribution of the rock stress causes deformation and destruction of the surrounding rock 1 – 3 . Before destroying the rock body, energy is inevitably released, resulting in acoustic emissions and microseismic phenomena 4 . In the process of back mining at the working face, the rock stress around the mining void area and hydraulic pillar is adjusted, and the surrounding rock is deformed and destroyed 5 .…”

Section: Introductionmentioning

confidence: 99%

Study on the damage characteristics of overburden of mining roof in deeply buried coal seam

Long

Hou

Xie

et al. 2022

Sci Rep

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The study of water-conducting fracture zone development height is key to the scientific prevention and control of water damage in mines. Based on the geological conditions of the Wenjiapo coal mine in Binchang, China, this paper investigates the development of water-conducting fracture zone in overlying bedrock during mining under large buried depth and huge thick aquifer by combining on-site well-location microseismic monitoring and laboratory similar material simulation. To overcome the limitation of the " limited outlook " of water-conducting fracture zone investigation, the spatial development characteristics of roof fissures in coal seam mining were determined by on-site " the underground - ground" combined microseismic monitoring and follow-up monitoring, and the development of overlying rock fracture under the large depth of burial was concluded. The fractures were mainly distributed in the upper part of the protective coal pillar on both sides of the working face, but less in the upper part of the working face, and primarily distributed in the protective coal pillar on the side of the working face and the adjacent mining area. To verify the accuracy of the conclusion, the overlying bedrock movement and deformation characteristics and the development process of the hydraulic fracture zone during coal seam mining were analyzed by simulating similar materials in the laboratory, using the monitored area as a prototype. The results show that the development height of the mining fracture zone obtained from microseismic monitoring is basically consistent with the simulation results of similar materials. The research finding have significant implications for the study of fracture distribution characteristics and the evolution law of mining overburden, and provide a foundation for scientific prevention and control of water damage on the roof.

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Section: Introductionmentioning

confidence: 99%

Study on the damage characteristics of overburden of mining roof in deeply buried coal seam

Long

Hou

Xie

et al. 2022

Sci Rep

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“…The energy loss caused by the moving fluid overcoming the frictional resistance along the pipe is called the friction loss. Its calculation equation is shown in Equation (1).…”

Section: Principle Of the Increasing Resistance And Reducing Pressure...mentioning

confidence: 99%

“…With the increasing depletion of shallow resources, the mining of deep resources has increased at home and abroad [1]. The number of mines over 1000 m is increasing both in China and in other countries [2,3].…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient

Wang

Mei

et al. 2022

Metals

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To solve the high slurry pressure and severe wear at some sections in backfilling pipelines, this study investigates the solution of using an auxiliary pipe to increase the resistance and reduce the pressure of the mine backfilling pipeline. Using computational fluid dynamics, three auxiliary pipe models, a Z-shaped pipe, a S-shaped pipe and a spiral pipe were constructed and the velocity and pressure distribution characteristics of the filling slurry in the auxiliary pipes were analyzed. The function of friction loss in spiral pipes with different pitches and spiral diameters was established, and the amendment equation for calculating the effective stowing gradient was studied when using spiral pipes to increase resistance and reduce pressure. The results show that, compared with the Z-shaped pipe and the S-shaped pipe, the velocity and pressure in the spiral pipe change continuously and steadily, and there is no obvious sudden change in the local velocity and pressure. Therefore, it is difficult to burst the pipe. When the velocity is 2.5 m/s and the vertical height of the pipe is 2.5 m, the friction loss of the filling slurry in the spiral pipe can reach 3.87~21.26 times that in the vertical pipe, indicating that the spiral pipe can effectively play the role of increasing resistance and reducing pressure. The relationship between the friction loss and spiral diameter is a linear function, and the relationship between the friction loss and pitch is a quadratic function. The three are binary quadratic function relationships. The equation for calculating the effective stowing gradient is obtained, which provides a convenient method for engineering applications and industrial design.

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“…Then, error analysis was carried out for the purpose of verifying the effectiveness and accuracy of the method presented in this study. In the three-dimensional homogeneous velocity model, the P-wave velocity (v) was a random value between 2000 m/s and 4000 m/s, and the source point S was randomly generated and irregularly distributed within the velocity model at a scale range of 50 m 3 .…”

Section: Homogeneous Velocity Modelmentioning

confidence: 99%

“…Microseismic monitoring technology is a geophysical technology used to evaluate the impacts, effects, and underground state of production activities through the observations and analyses of microseismic events [1]. This type of technology has been widely used in mining [2,3], tunnel construction [4,5], slope [6,7], hydraulic fracturing [8,9], reservoirs [10,11], and other fields. Accurate microseismic localization methods are the basis of stability analysis and the study of microseismic monitoring technology.…”

Section: Introductionmentioning

confidence: 99%

Microseismic P-Wave Travel Time Computation and 3D Localization Based on a 3D High-Order Fast Marching Method

Wang

et al. 2021

Sensors

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The travel time computation of microseismic waves in different directions (particularly, the diagonal direction) in three-dimensional space has been found to be inaccurate, which seriously affects the localization accuracy of three-dimensional microseismic sources. In order to solve this problem, this research study developed a method of calculating the P-wave travel time based on a 3D high-order fast marching method (3D_H_FMM). This study focused on designing a high-order finite-difference operator in order to realize the accurate calculation of the P-wave travel time in three-dimensional space. The method was validated using homogeneous velocity models and inhomogeneous layered media velocity models of different scales. The results showed that the overall mean absolute error (MAE) of the two homogenous models using 3D_H_FMM had been reduced by 88.335%, and 90.593% compared with the traditional 3D_FMM. On that basis, the three-dimensional localization of microseismic sources was carried out using a particle swarm optimization algorithm. The developed 3D_H_FMM was used to calculate the travel time, then to conduct the localization of the microseismic source in inhomogeneous models. The mean error of the localization results of the different positions in the three-dimensional space was determined to be 1.901 m, and the localization accuracy was found to be superior to that of the traditional 3D_FMM method (mean absolute localization error: 3.447 m) with the small-scaled inhomogeneous model.

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Prediction of rockbursts in a typical island working face of a coal mine through microseismic monitoring technology

Cited by 47 publications

References 53 publications

Study on the damage characteristics of overburden of mining roof in deeply buried coal seam

Study on the damage characteristics of overburden of mining roof in deeply buried coal seam

The Characteristics of Spiral Pipe Increasing Resistance and Reducing Pressure and the Amendment Equation of Stowing Gradient

Microseismic P-Wave Travel Time Computation and 3D Localization Based on a 3D High-Order Fast Marching Method

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