The use of pre buried in the structural layer of the drainage pipe hole as a deformation of the default seam to prevent the development of cracks.
行使预埋在结构层中的排水管孔作为变形预设缝，防止裂缝开展。
EME occurred when inhomogeneous coal or rock is loaded at uneven speed with the moving of internal electrical charges during the development of cracks.
煤岩体的电磁辐射是由于非均质煤岩体在应力作用下非均匀变速变形及裂纹形成与扩展过程中，内部电荷的迁移而产生。
On the basis of these data, the main factors affecting the crack openings are found according to the basic principles on the emergence and development of cracks.
在试验资料的基础上，根据裂缝出现和开展的基本原理，找出影响裂缝宽度的主要因素。
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