阐述了难钻进地层用新型金刚石钻头的结构、制造特点，射流式钻具的原理、类型，以及防塌型稀释剂的作用机理。
The structure and manufacture of new type of bits, working principle and types of fluidic drilling tools, action mechanism of anti-cave-in thinners, for difficult formation drilling were discussed.
由于爆破地震作用，很可能造成两隧道间岩柱的局部或整体垮塌，进而影响隧道围岩的稳定。
The seismic action of blasting results in the part or whole collapsing of inter-space rock in all probability, which will influence the stability of surrounding rock.
这种结构能有效的控制混凝土在爆炸冲击荷载作用下的开裂、震塌，限制结构的变形，增强结构稳定性。
Its effect of controlling the concrete's crack and crush, decreasing the structural deformation and improving the structural stability is marked.
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