Technology and practice of remediation of the damaged shaft wall in Jining Mine No.2

Due to long time influence of factors such as mine geology and hydrogeology as well as the limitation of construction technology, problems such as quality defect and pulverization destruction at large area have occurred in the wall of the auxiliary shaft in Jining Mine No.2. Rock fall and local fall-off occurring in the wall area damaged by pulverization are threatening at any time the safety of equipment, cable and personnel in the shaft, the risk of overall collapse exists in the wall with defect, and then influencing the normal use of the shaft, and very probably resulting in serious safety accident. Through analysis of the ground where the damaged and pulverized shaft wall was located, it was considered that the concrete eroded by sulphate made the shaft wall pulverized. The scheme using "anchor net blasting plus silicane immersion in shaft wall surface "to remediate and reinforce the shaft wall was put forward, the potential safety hazard of the shaft was eliminated and good effect was achieved.