With the increasing depletion of coal resources in China and the gradual increase of coal mining near corner coal and faults, there is an urgent need for more rational coal mining. For example, the "trial value m...With the increasing depletion of coal resources in China and the gradual increase of coal mining near corner coal and faults, there is an urgent need for more rational coal mining. For example, the "trial value method" is used to reserve fault coal pillars for coal mine faults, which can not only prevent the threat of coal mine water damage, but also reduce the stagnant coal resources. Therefore, the position of coal pillar line (the width of fault safety water barrier coal pillar) should be reasonably determined. It is imperative for aging or resource exhausted mines. At the same time, it also provides a powerful guarantee for prolonging the service life of the mine. The definition of fault coal pillar is that in order to reduce coal loss and avoid poor roadway stability caused by construction in fault zone, some necessary coal pillars of coal mine are arranged in fault (such as horizontal coal pillar and section coal pillar), which is called fault coal pillar. Water drainage coal pillar is to separate aquifer or goaf and other water bearing space from the workplace. This paper describes in detail the selection of the target layer of waterproof coal pillar, the basis and calculation method of waterproof coal (rock) pillar reservation, and the specific steps of calculating fault waterproof coal (rock) pillar by "trial value method", and describes in detail the quoted specific formula, corresponding parameters and the selection of the best point of "trial value method" by drawing method, which provides an effective reference basis for everyone.展开更多
A necessary big step up in the modern water wave theories and their widespread application in ocean engineering is how to obtain 6-wave resonance conditions and to prove it. In the light of the existing forms and char...A necessary big step up in the modern water wave theories and their widespread application in ocean engineering is how to obtain 6-wave resonance conditions and to prove it. In the light of the existing forms and characteristics of 3-wave, 4-wave and 5-wave resonance conditions, the 6-wave resonance conditions are proposed and proved for currently a maximum wave-wave resonance interactions of the ocean surface gravity waves in deep water, which will be indispensable to both the Kolmogorov spectrum of the corresponding universal wave turbulence and a synthetic 4-5-6-wave resonant model for the ocean surface gravity waves.展开更多
文摘With the increasing depletion of coal resources in China and the gradual increase of coal mining near corner coal and faults, there is an urgent need for more rational coal mining. For example, the "trial value method" is used to reserve fault coal pillars for coal mine faults, which can not only prevent the threat of coal mine water damage, but also reduce the stagnant coal resources. Therefore, the position of coal pillar line (the width of fault safety water barrier coal pillar) should be reasonably determined. It is imperative for aging or resource exhausted mines. At the same time, it also provides a powerful guarantee for prolonging the service life of the mine. The definition of fault coal pillar is that in order to reduce coal loss and avoid poor roadway stability caused by construction in fault zone, some necessary coal pillars of coal mine are arranged in fault (such as horizontal coal pillar and section coal pillar), which is called fault coal pillar. Water drainage coal pillar is to separate aquifer or goaf and other water bearing space from the workplace. This paper describes in detail the selection of the target layer of waterproof coal pillar, the basis and calculation method of waterproof coal (rock) pillar reservation, and the specific steps of calculating fault waterproof coal (rock) pillar by "trial value method", and describes in detail the quoted specific formula, corresponding parameters and the selection of the best point of "trial value method" by drawing method, which provides an effective reference basis for everyone.
基金Project supported by the National Natural Science Foundation of China(Grant No.11772180)the State Key Laboratory of Ocean Engineering of China(Grant No.1503)
文摘A necessary big step up in the modern water wave theories and their widespread application in ocean engineering is how to obtain 6-wave resonance conditions and to prove it. In the light of the existing forms and characteristics of 3-wave, 4-wave and 5-wave resonance conditions, the 6-wave resonance conditions are proposed and proved for currently a maximum wave-wave resonance interactions of the ocean surface gravity waves in deep water, which will be indispensable to both the Kolmogorov spectrum of the corresponding universal wave turbulence and a synthetic 4-5-6-wave resonant model for the ocean surface gravity waves.
