泄压孔的设置可以有效减小冻胀压力，并有利于冻土帷幕内土体的开挖；

Pressure relief holes give a big help to decrease the frost-heaving pressure and excavate soil enclosed by frozen curtain.

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背部，设有泄压后盖及泄压孔，以释放因过载弹性元件破裂而产生的内部压力，增强了人员及设施的安全性。

There is Burst disk pressure in the gauge, blow out hole in the back to relief the presure inside caused by failure of elastic element.

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限流孔板； 火灾泄压； 实验论证；

Restriction orifice; Fire relief; Diameter selection;

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