The mine flooding happed during construction of the air shaft in Qidong Coal Mine. 祁東煤礦風井在建井過程中，發生鑽井井壁突水事故，井筒被淹。
Based on the test results, the design method of vertical bearing capacity of the retractable drilling shaft lining was obtained. 由此提出了可縮性鑽井井壁豎向承載力的設計方法。
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