According to geological condition of this mined-out area, a three hole-ins well has designed to carry out surface grouting and fire-area sealing.

根据该采空区地质条件，设计了三开井身结构，对采空区进行地面注浆及封堵处理。

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According to geological condition of this mined-out area, a three hole-ins well has designed to carry out surface grouting and fire-area sealing.

根据该采空区地质条件，设计了三开井身结构，对采空区进行地面注浆及封堵处理。

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