东滩煤矿副井井壁腐蚀粉化机理及治理技术

Corrosion and pulverization mechanism and treatment technology of auxiliary shaft wall in Dongtan Coal Mine

东滩煤矿副井井深-440m以下基岩段井壁粉化严重,且有加速、加剧的趋势,严重威胁矿井的安全。通过相关理论及试验研究发现,井筒淋水中高浓度的SO42-离子是造成副井井壁腐蚀粉化的主要原因。副井治理采用“井壁淋水治理+井壁严重粉化段修复加固+井壁表层涂层处理”的综合治理措施。目前副井井壁治理已逾两年时间,水点封堵后无返渗现象,锚网喷修复区域与井壁契合程度依然较好,井壁腐蚀粉化现象明显减弱。该治理经验可为类似混凝土腐蚀粉化治理提供借鉴。

The borehole wall of the bedrock section below the depth of-440m in Dongtan Coal Mine is severely pulverized,and there is a tendency of acceleration and intensification,which seriously threatens the safety of the mine.According to relevant theoretical and experimental studies,it was found that high concentration of SO42-ions in the wellbore leaching water is the main reason for the corrosion and pulverization of the side wall of the auxiliary well.The secondary well treatment adopts the comprehensive treatment measures of"wellwall water spraying treatment+well wall severely pulverized section repair and reinforcement+well wall surface coating treatment".At present,the treatment of the side wall of the auxiliary well has been over two years.There is no back seepage phenomenon after the water point is blocked.The anchor mesh spray repair area is still in good agreement with the well wall,and the corrosion and pulverization of the well wall is significantly reduced.The experience of Dongtan Coal Mine's auxiliary shaft treatment can provide reference for similar concrete corrosion and pulverization treatment.