As coal burst normally occurs in the area of high stress concentration,it is of significance to study the features of regional stress field in coal mines.Primitive stress field,mining-induced stress field and their co...As coal burst normally occurs in the area of high stress concentration,it is of significance to study the features of regional stress field in coal mines.Primitive stress field,mining-induced stress field and their coupling effect are investigated through the methods of theoretical analysis,field measurement,numerical simulation and wave velocity CT inversion,and the relationship among regional stress field,high-energy seismic events and coal bursts are analyzed.Investigation of the 3#mining district in Xingcun coal mine shows that:(1)Though stress concentration changes in the mining process,several special areas witnesses stress concentration in the whole mining process,such as the rise pillar area,several syncline axis areas and large fault areas;(2)Coal burst occurrence and high-energy seismic events have a close relationship with regional stress field.Coal bursts and high-energy seismic events tend to occur in areas of stable stress concentration,such as the rise area,several syncline axis areas and large fault areas.Targeted control of stress field for coal burst prevention is developed based on stress field detection.The process of targeted control of stress field for coal burst prevention is:detection of regional stress field based mainly on wave velocity CT,identification of stress concentration,implementation of destress measures to control the identified stress concentration.This method of stress field control was applied to LW3306 working face in Xingcun coal mine and coal burst hazards were effectively controlled in LW3306.展开更多
Presented in this manuscript are conventional electrical engineering tools to model the earth as a rotating electrical machine. Calculations using known parameters of the earth and measured field data has resulted in ...Presented in this manuscript are conventional electrical engineering tools to model the earth as a rotating electrical machine. Calculations using known parameters of the earth and measured field data has resulted in new understanding of the earth’s electrical system and gyroscopic rotation. The material makeup of the inner earth is better understood based on derived permeability and permittivity constants. The planet has been modeled as simple coils and then as a parallel impedance circuit which has led to fundamental insight into planetary speed control and RLC combination for Schumann Resonance of 7.83 Hz. Torque and Voltage Constants and the inverse Speed Constant are calculated using three methods and all compare favorably with Newton’s Gravitational Constant. A helical resonator is referenced and Schumann’s Resonant ideal frequency is calculated and compared with others idealism. A new theory of gravity based on particle velocity selector at the poles is postulated. Two equations are presented as the needed links between Faraday’s electromagnetism and Newtonian physics. Acceleration and Deceleration of earth is explained as a centripetal governor. A new equation for planetary attraction and the attraction of atomic matter is theorized. Rotation of the earth’s electrical coil is explained in terms of the Richardson effect. Electric power transfer from the sun to the planets is proposed via Flux Transfer Events. The impact of this evolving science of electromagnetic modeling of planets will be magnified as the theory is proven, and found to be useful for future generations of engineers and scientists who seek to discover our world and other planets.展开更多
基金funded by the National Key Research and Development Program of China(2020YFB1314200)the National Natural Science Foundation of China(51874292,51804303,51934007)the Natural Science Foundation of Jiangsu Province(BK20180643).
文摘As coal burst normally occurs in the area of high stress concentration,it is of significance to study the features of regional stress field in coal mines.Primitive stress field,mining-induced stress field and their coupling effect are investigated through the methods of theoretical analysis,field measurement,numerical simulation and wave velocity CT inversion,and the relationship among regional stress field,high-energy seismic events and coal bursts are analyzed.Investigation of the 3#mining district in Xingcun coal mine shows that:(1)Though stress concentration changes in the mining process,several special areas witnesses stress concentration in the whole mining process,such as the rise pillar area,several syncline axis areas and large fault areas;(2)Coal burst occurrence and high-energy seismic events have a close relationship with regional stress field.Coal bursts and high-energy seismic events tend to occur in areas of stable stress concentration,such as the rise area,several syncline axis areas and large fault areas.Targeted control of stress field for coal burst prevention is developed based on stress field detection.The process of targeted control of stress field for coal burst prevention is:detection of regional stress field based mainly on wave velocity CT,identification of stress concentration,implementation of destress measures to control the identified stress concentration.This method of stress field control was applied to LW3306 working face in Xingcun coal mine and coal burst hazards were effectively controlled in LW3306.
文摘Presented in this manuscript are conventional electrical engineering tools to model the earth as a rotating electrical machine. Calculations using known parameters of the earth and measured field data has resulted in new understanding of the earth’s electrical system and gyroscopic rotation. The material makeup of the inner earth is better understood based on derived permeability and permittivity constants. The planet has been modeled as simple coils and then as a parallel impedance circuit which has led to fundamental insight into planetary speed control and RLC combination for Schumann Resonance of 7.83 Hz. Torque and Voltage Constants and the inverse Speed Constant are calculated using three methods and all compare favorably with Newton’s Gravitational Constant. A helical resonator is referenced and Schumann’s Resonant ideal frequency is calculated and compared with others idealism. A new theory of gravity based on particle velocity selector at the poles is postulated. Two equations are presented as the needed links between Faraday’s electromagnetism and Newtonian physics. Acceleration and Deceleration of earth is explained as a centripetal governor. A new equation for planetary attraction and the attraction of atomic matter is theorized. Rotation of the earth’s electrical coil is explained in terms of the Richardson effect. Electric power transfer from the sun to the planets is proposed via Flux Transfer Events. The impact of this evolving science of electromagnetic modeling of planets will be magnified as the theory is proven, and found to be useful for future generations of engineers and scientists who seek to discover our world and other planets.
