Microseismic source location is the essential factor in microseismic monitoring technology, and its loca- tion precision has a large impact on the performance of the technique. Here, we discuss the problem of low-prec...Microseismic source location is the essential factor in microseismic monitoring technology, and its loca- tion precision has a large impact on the performance of the technique. Here, we discuss the problem of low-precision location identification for microseismic events in a mine, as may be obtained using conven-tional location methods that are based on arrival time. In this paper, microseismic location characteristics in mining are analyzed according to the characteristics of the mine＇s microseismic wavefield. We review research progress in mine-related microseismic source location methods in recent years, including the combination of the Geiger method with the linear method, combined microseismic event location method, optimization of relative location method, location method without pre-measured velocity, and location method without arrival time picking. The advantages and disadvantages of these methods are discussed, along with their feasible conditions. The influences of geophone distribution, first arrival time picking, and the velocity model on microseismic source location are analyzed, and measures are proposed to influence these factors. Approaches to solve the problem under study include adopting information fusion, combining and optimizing existing methods, and creating new methods to realize high-precision microseismic source location. Optimization of the velocity structure, along with applications of the time-reversal imaging technique, passive time-reversal mirror, and relative interferometric imag-ing, are expected to greatly improve microseismic location precision in mines. This paper also discusses the potential application of information fusion and deep learning methods in microseismic source location in mines. These new and innovative location methods for microseismic source location have extensive prospects for development.展开更多
with the rapid development of China's information technology, China's urban construction rail transit is becoming more and more developed. Rail transit is one of the important tools to relieve the pressure of ...with the rapid development of China's information technology, China's urban construction rail transit is becoming more and more developed. Rail transit is one of the important tools to relieve the pressure of urban traffic, and its role in urban development is very important. The construction of smart stations in rail transit can not only better relieve urban traffic pressure, but also realize diversified smart station management, and ensure that people can take rail transit more conveniently, and improve travel efficiency and quality. Based on this, this paper focuses on the analysis of the development prospects of smart stations in urban rail transit for reference.展开更多
Mineral resources have played a very important role in promoting the development of Chinese society. Due to the continuous development of society and economy, Chinese demand for mineral resources is also increasing, a...Mineral resources have played a very important role in promoting the development of Chinese society. Due to the continuous development of society and economy, Chinese demand for mineral resources is also increasing, and mining technology is also improving. Open-pit mining technology, as the main operation mode in mining industry, has been widely used. However, due to the excessive development and utilization of resources, the former open-pit mining site has already entered the deep concave mining stage, which further leads to the worse working environment. Therefore, it is necessary to further improve the mining technology. Next, this paper mainly studies the current development of opencast mining technology in China, and briefly expounds the future prospect.展开更多
基金This research was supported by the National Key Research and Development Program of China （2016YFC0801405 and 2017YFC0804105）, and the National Natural Science Foundation of China （51574250）. The authors also greatly indebted to Dr. Ye Chen, who is now working at the Research Centre of Photonics and Instrumentation at City, University of London, for his rigorous suggestions for this paper.
文摘Microseismic source location is the essential factor in microseismic monitoring technology, and its loca- tion precision has a large impact on the performance of the technique. Here, we discuss the problem of low-precision location identification for microseismic events in a mine, as may be obtained using conven-tional location methods that are based on arrival time. In this paper, microseismic location characteristics in mining are analyzed according to the characteristics of the mine＇s microseismic wavefield. We review research progress in mine-related microseismic source location methods in recent years, including the combination of the Geiger method with the linear method, combined microseismic event location method, optimization of relative location method, location method without pre-measured velocity, and location method without arrival time picking. The advantages and disadvantages of these methods are discussed, along with their feasible conditions. The influences of geophone distribution, first arrival time picking, and the velocity model on microseismic source location are analyzed, and measures are proposed to influence these factors. Approaches to solve the problem under study include adopting information fusion, combining and optimizing existing methods, and creating new methods to realize high-precision microseismic source location. Optimization of the velocity structure, along with applications of the time-reversal imaging technique, passive time-reversal mirror, and relative interferometric imag-ing, are expected to greatly improve microseismic location precision in mines. This paper also discusses the potential application of information fusion and deep learning methods in microseismic source location in mines. These new and innovative location methods for microseismic source location have extensive prospects for development.
文摘with the rapid development of China's information technology, China's urban construction rail transit is becoming more and more developed. Rail transit is one of the important tools to relieve the pressure of urban traffic, and its role in urban development is very important. The construction of smart stations in rail transit can not only better relieve urban traffic pressure, but also realize diversified smart station management, and ensure that people can take rail transit more conveniently, and improve travel efficiency and quality. Based on this, this paper focuses on the analysis of the development prospects of smart stations in urban rail transit for reference.
文摘Mineral resources have played a very important role in promoting the development of Chinese society. Due to the continuous development of society and economy, Chinese demand for mineral resources is also increasing, and mining technology is also improving. Open-pit mining technology, as the main operation mode in mining industry, has been widely used. However, due to the excessive development and utilization of resources, the former open-pit mining site has already entered the deep concave mining stage, which further leads to the worse working environment. Therefore, it is necessary to further improve the mining technology. Next, this paper mainly studies the current development of opencast mining technology in China, and briefly expounds the future prospect.
