The coal and gas outburst became more and more dangerous along with the thickness of coal seam changing and increasing.
煤的厚度越大、煤厚变化程度越大的地区煤与瓦斯突出危险程度越大。
The structural deformation is the principal geological factor that affects the thickness variation of coal seam on a mine field scale.
构造作用是控制井田范围内煤层厚度变化的主要地质因素。
From Hales method, reversed refracted wave method shows accuracy and efficiency in detecting the thickness of remained coal seam.
以哈尔·斯法为例，将相遇折射波法用于剩余煤厚探测中，具有精确、高效、快速的特点。
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