The paper firstly put forward the energy indication of geophysical field of gas outburst in accordance with the mechanically destroyed process of gas outburst and the maximum shearing stresstheory.
针对瓦斯突出力学破坏过程，采用最大剪切应力理论首次提出了瓦斯突出地球物理场的能量标志。
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The radius of plastic area, the maximum compress stress caused by driving pile , and the pore water stress can be concluded by using the cavity expansion method and the effective stress theory.
This paper analyzes the stress wave of hoisting steel rope caused by impact and The position and size of maximum impact load have been found in theory.