淮北矿区巨厚火成岩下隔离注浆充填减灾机理研究  

Study on mechanism of disaster reduction under extremely-thick igneous rock by isolated grouting in Huaibei Mining Area

作　　者：倪建明[1] 

机构地区：[1]淮北矿业(集团)有限责任公司,安徽淮北235000

出　　处：《煤炭科学技术》2017年第8期55-59,共5页Coal Science and Technology

摘　　要：为解决淮北矿区部分矿井面临的坚硬厚覆岩下采煤灾害防治问题,对海孜煤矿II102采区巨厚火成岩下隔离注浆充填减灾进行了试验研究,揭示了坚硬厚覆岩下采动致灾机理,火成岩厚120~170 m、单向抗压强度120 MPa、完整性好,在其下方煤层开采时该岩层将大面积悬顶,使载荷施加于实体煤上形成应力集中;加之采深大,在该岩层下该工作面安全生产面临极大威胁。为此,提出了隔离注浆充填减灾技术措施,即在已采与待采工作面之间留设隔离煤柱,并先对已采工作面进行注浆充填消除离层空间,在后续工作面开采中实施注浆充填,从而对覆岩形成有效支撑。试验结果表明:地面9个注浆钻孔,向采动离层带、采空区充填粉煤灰471 994 m^3,安全采出煤炭56.3万t,消除了采区动力灾害威胁。In order to solve the problem of disaster prevention and control under the overlying thick and hard strata in Huaibei Mining Area,grouting for disaster reduction was tested below an extremely-thick igneous rock in the NoII102 mining district of Haizi Mine.The mechanism of mining-induced disaster by the igneous rock was revealed.The thick rock overlying the NoII102 mining district had a thickness of 120～170 m and an uniaxial compressive strength of 120 MPa.During the mining,this rock roof yielded the overburden load to solid coal due to the underlying bedding separation under igneous rock. Because of the stress concentration and the large depth,this rock roof became the key issue for this area.A technical measure of isolated grouting was then proposed for disaster reduction.An isolated coal pillar was arranged between the mined area and non-mined longwall panels.Grouting was first conducted for the mined panels,which was followed by the grouting of the subsequent panel during its extraction.Support was then produced for the overburden.Nine boreholes were drilled for the grouting of bedding plane separation zones and the caved zones.A total volume of 471 994 m^3 fly ash was injected with an extraction of 563 000 tons of coal.The risks for the disasters were eliminated for the mining area.

关 键 词：巨厚火成岩 隔离注浆 关键层 动力灾害 

分 类 号：TD327[矿业工程—矿井建设]