兖州矿区鲍店煤矿主副井破坏原因分析

Analysis of crack cause of main and auxiliary Shaft Wall of Baodian Coal mine Yan Zhou mine bureall

本文认为兖州矿区鲍店煤矿主、副井井筒变形破坏的根本原因是第四系下组地下水加速下降导致地层沉降而产生垂向附加应力的结果。应采取的防治措施有：①完善地下水和地面沉降监测系统；②在第四系砂层与下伏基岩接触部位进行注浆，控制下组水位下降；③对主、副井井筒进行壁后注浆加增加强度，防止进一步破坏。

This paper belive the mainly have cause thae main and auxiliary pit shaf crack in Baodiancoal mine of Yan Zhou mine bureau,It is belong to the vertical additional stress created by compress-ible strata subsidence induced by quicken decent of ground water table of lower Quaternary aquifer.Taking main prevention methods are :①to perfect the observing systm of groundwater and surfacesubsidence,②iniecting mud fluid into connetion between Quaternary sand cayer and underlying bedrock,③injecting mud fluid behind main and auxilloary shaft wall to increase strength and prevent fromadvanced damage.