Identifying the basic properties of mining fissure elliptic paraboloid zone and gas delivery law governing goaf represents an effective measure to control gas.
研究采动裂隙椭抛带的基本性质及其采空区瓦斯运移的规律，可以采取有效措施进行瓦斯治理。
After raining, a dynamic Elliptic Paraboloid Zone distribution would be formed if the bed-separated fissures and broken fissures of the overlying stratum were connected.
综放开采后，上覆岩层中的离层裂隙和破断裂隙相互贯通后会形成一个动态变化的椭抛带分布。
After raining, a dynamic Elliptic Paraboloid Zone distribution would be formed if the bed-separated fissures and broken fissures of the overlying stratum were connected.
综放开采后，上覆岩层中的离层裂隙和破断裂隙相互贯通后会形成一个动态变化的椭抛带分布。
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