The overlying strata of the coal bed roof are dominated by sedimentary rocks such as shale, sand stone and limestone, whose physical and mechanic properties differ greatly.
煤层顶板覆岩一般以页岩、砂岩、灰岩等沉积岩为主，其物理力学性质差异很大。
The major pay bed is low permeable ultra dense sandstone. Its permeability and pore throat texture are very sensitive to the net pressure of overlying strata.
主要产层为低渗透超致密砂岩，其渗透率和孔喉结构对上覆地层净压力很敏感。
The preconditioned fastest descent means in inversion achieves simultaneous in - versions of overlying-bed velocity and refractor depth.
反演过程中利用具先决的最速下降法，可解决覆盖层速度和折射界面深度同时反演问题。
Samples of overlying water, suspended particles and bed mud in the Inner Mongolia stretch of the Yellow River were collected systemically and their heavy metal element contents were analysed.
系统地采集黄河内蒙古段上覆水、悬浮物和底泥样品，分析其中重金属元素的含量。
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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