【摘要】 运用理论计算、数值模拟并结合现场试验研究了凉水井煤矿2近距煤层上组煤开采后底板破坏深度及下组煤顶板导裂带高度。结果表明,上组煤底板在采动后应力集中影响下产生破裂,随后受周期来压的影响稍有加深至16 m。当开采下组煤时,导裂带裂隙叠加并贯通至上组煤老空区,同时上组煤导裂带会更加发育,松散含水层水及地表水将更易导入采煤工作面,应提前预防。更多还原

【Abstract】 Use the theoretical calculation, numerical simulation and field test to study the Liangshuijing mine crack depth of the upper coal seam′s floor and the crack height of the lower coal seam′s roof rock strata. The results show: when mining the upper coal seam the floor crack formed, then with the roof rock periodic weighting, the crack will slightly deepen to 16 m. When exploiting the lower coal seam,the crack of the lower coal seam′s roof rock strata will stack up with the floor crack of the upper coal seam, making the crack reach to the goaf, meanwhile, the crack of the upper coal group will be more developed, the loose aquifer and surface water will be more easy to blast in working face, should be early prevented.更多还原