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介绍了温家庄铁矿副井钻井井壁施工期间钢筋应力的实测方案,分析了钻井井壁钢筋应力的变化规律,结果表明:施工期钻井井壁钢筋以受压为主,环向钢筋压应力大于竖向钢筋,钢筋应力变化阶段与施工工序相对应。漂浮下沉阶段钢筋应力呈现“双线性”特点,实测与理论计算应力相吻合;增加配重水阶段环向钢筋压应力减小而竖向钢筋压应力增加;首次注浆阶段钢筋压应力显著减小,个别钢筋出现拉应力;后3次注浆阶段钢筋压应力先增加后部分恢复,环向钢筋应力变化大于竖向钢筋;抽排配重水阶段环向钢筋压应力显著增加,竖向钢筋应力变化不大;二次补注浆阶段钢筋压应力先增加后恢复,但恢复幅度较前述注浆有所减小。施工完成后钢筋最大应力达到屈服应力的41%。
The measurement scheme of steel bar stress during the construction of auxiliary shaft of Wenjiazhuang Iron Mine is discussed. The change rule of steel bar stress in drilling shaft wall is analyzed. The results show that: Stress is greater than the vertical reinforcement, reinforcement stress changes phase corresponds to the construction process. During the floating subsidence, the stress of rebar shows a characteristic of “bilinear”, and the measured stress agrees well with the theoretical calculated stress. The compressive stress of hoop reinforcement decreases and the compressive stress of vertical rebar increases with the increase of water weight. The tensile stress of individual steel bars was significantly reduced; the compressive stress of steel bars firstly increased and then recovered partially in the third grouting stage, and the stress change of hoop steel bars was greater than that of vertical steel bars; the compressive stress of hoop steel bars in pumping / The stress of rebar did not change much; the compressive stress of rebar increased firstly and then recovered after the second replenishment, but the amplitude of recovery was lower than that of the previous grouting. After the completion of the construction, the maximum stress reaches 41% of the yield stress.