thin and medium seam 薄及中厚煤层
medium-thick seam 中厚煤层
medium thick seam 中厚煤层
medium-steep seam 中倾斜矿层
medium-thickness coal seam [矿业] 中厚煤层
medium-thickness seam mining method [矿业] 中厚煤层采煤法
medium soft seam 中软煤层
However, coal is usually assumed to be an isotropic medium in the traditional coal seismic exploration, and the impacts of fractures on seam are not taken into account.
传统的煤田地震勘探将煤层假设为单一的各向同性介质，没有考虑其中裂隙对煤层的影响。
On the basis of probability integration method for flat coal seam, the paper discusses surface subsidence random medium model for mining inclined seams with an Angle of a.
在水平煤层概率积分法的基础上，讨论了开采倾角为口的倾斜煤层的地表下沉随机介质模型。
This paper summarizes the organization and key technology of rapid construction medium and large head chamber in thick seam, and provides valuable experience for the project under similar condition.
本文全面总结了厚煤层中大型机头硐室快速施工的组织及关键技术技巧，为在同类条件下施工类似工程提供了宝贵经验。
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