依据济宁三号煤矿十二采区工作面地质条件及开采参数,对上解放层工作面开采过程进行实验室相似模拟,结合现场实测结果分析上解放层开采对下煤层的卸压作用。研究结果表明:开采解放层后下方煤岩层发生膨胀变形,破坏其完整性,释放了大量弹性能,被解放层煤层应力得到释放,最大应力释放率19.2%,起到了良好卸压效果;通过实测结果计算可得工作面走向卸压角为77°,倾向卸压角为79°。

Based on the geological conditions and mining parameters of the coal mining face in No.12 mining block of Jining No.3 Mine,a similar simulation in the la b was conducted on the mining process of the coal mining face in the uper liberated seam.In combination with the site measured results, the pressure releasing function of the uper liberated seam mining to the low seam was analyzed.The study results showed that after the liberated seam mined,selling and deformation occurred in the I oW seam and rock strata and the integrality of the low seam was destroyed. Great number of the elastic energy were released and the seam stress of the liberated seam were released.The max stress released rate was 19.2% and a good pressure releasing effect was well played.The calculation of the site results showed that the pressur e releasing angle along the coal mining face strike was 77° and the inclined pressure releasing angle was 79°.

国家重点基础研究发展计划(973计划)资助项目(2010CB226805)；国家自然科学基金资助项目(50490273,51104150)；煤炭资源与安全开采国家重点实验室自主研究课题资助项目(SKLCRSM10X05)；