禾草沟矿井一号回风斜井井筒暗挖段32~47m为古滑坡系粉砂土层且富含水。该段井筒采用29U型钢支架支护后,由于施工过程中经扰动砂土层变为根皮泥状、出水,造成该段井筒严重变形、下沉。经研究采用二次明槽开挖后,对井筒底部不穗定粘土进行置换,铺设胞腔袋,在底板增设横梁,在保证安全和质量的情况下顺利通过了该不穗定地段。 The No. 1 return wind inclined shaft of Hecaogou Mine No. 32 ~ 47m is silt layer of ancient landslide and is rich in water. The section of wellbore with 29U steel support, due to the construction process of the disturbed sand and soil into mud and root bark, water, resulting in serious deformation of the section of the shaft, sinking. After the excavation of the secondary clear channel, the unsheltered clay at the bottom of the wellbore is replaced, the cell bag is laid, the crossbeam is added on the bottom plate, and the unsuitable section passes smoothly under the condition of ensuring safety and quality.