中文摘要：

针对部分“三下”压煤区域地质条件及已存在巷道系统的限制问题，为保证固体充填开采之后对岩层移动及地表变形的控制效果，提出了预掘两巷前进式固体充填采煤技术，分析了该技术的原理及难点，建立了预掘两巷前进式固体充填系统、优化了充填采煤关键设备结构及布置方案，设计了固体充填采煤无煤柱沿空留巷方案及工艺，优化了充填采煤与沿空留巷一体化工艺。现场实践表明，预掘两巷前进式固体充填采煤技术可有效控制岩层移动与地表变形，采空区充实率达90．6％，无煤柱沿空留巷断面保持在原断面的90％以上，地表最大下沉值125mm，可安全高效地开采类似条件“三下”压煤资源。

英文摘要：

Restricted by geological conditions and existing roadways layout of some mining area under buildings, railways, and water bodies, to guarantee the controlling effect of solid backfill mining to strata movement and ground deformation, the article proposed solid backfill mining technology on condition of two entries pre-excavation, analyzed its principle and the technical difficulties, established advancing solid backfill mining system on condition of two entries pre-excavation, optimized key equipment structure for backfill mining and corresponding layout, and designed an integrated technique and a comprehensive system based on the technical features of both solid backfill mining and gob-side entry. On-site practice shows that the filling ratio of 90.6% is achieved, the cross section of the retained entries account for more than 90% of the original one, and the maximal sinking value of the ground is 125 mm, which prove this technology can effectively control the strata movement and ground deformation. This integrated technology shows a great potential for excavating the coal resource under similar conditions.