东庞井田奥灰顶部注浆改造性研究

Study on grout transformation Ordovician limestone top of Dongpang coalfield

通过对东庞矿已施工的地面钻孔和14个井下钻孔成果资料分析,发现东庞井田奥灰富水性极不均一,且随着埋深的增加,奥灰上部含水层富水性逐渐减弱,奥灰顶面下20~40m岩层富水性极弱。为探查奥灰的富水性,在该矿井下9201外段试验面施工了29个奥灰顶部注浆改造钻孔,根据钻孔成果资料,试验区奥灰上部40 m段富水性弱、渗透性差,富水性不均一,根据钻孔压水试验结果,试验面奥灰上部大部分为微透水岩石,局部弱透水区域经注浆改造后,可以做为隔水层利用。通过注浆改造奥灰顶部含水层为隔水层后,可以保证深部区域9号煤安全带压开采。

Based on surface drilling and 14 underground drilling results of Dongpang Mine,the unevenness of Ordovician limestone water richness was found,it decreased as the increasing depth,under Ordovician roof 20~40 m,the water richness was poor.In order to explore water richness features,29 Ordovician limestone roof grouting drillings were constructed outside the 9201 working face,the result showed that upper the limestone 40 m with poor water richness and permeability,based on the drilling water pressure test result,the upper part is mostly subtle permeable rocks,part of weak permeable was change into water-resisting layer after grouting,ensuring the safe mining of No.9 coal seam.