To know the gas-bearing condition in shallow stratum, it must do two main works: calculate the store parameter and modeling set and distinguish hydrous and gas.

要搞清楚地层的含气状况，则需要开展两方面的工作，即储层参数计算模型建立与含水含气性识别。

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Based on the formulas of oblique section bearing capacity and normal section bearing capacity, the paper set rules to determine the failure mode of the wall and gave several main factors.

根据墙体斜截面抗剪极限承载力公式和正截面极限承载力公式，给出了墙体最终发生弯、剪破坏模式的判定，并提出了影响墙体最终破坏模式的主要因素。

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Shield damage caused by sets of the main reasons for bearing damage or wear caused by exceeding limits set, set of rotor rub shield damage;

造成屏蔽套损坏的原因，主要是轴承损坏或磨损超过极限值而造成定、转子屏蔽套相擦而损坏；

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