中文摘要：

为解决济宁二号煤矿工作面回采距离短、掘进速度慢、采掘接替紧张的难题，通过采用墩柱压力试验、建立力学模型、理论计算及现场试验方法，创新性地提出采用墩柱结构进行沿空留巷。结果表明：墩柱能够满足留巷强度要求，切顶所需压力为21．96MPa；当钢管内砂石质量配比为1．0：1．6时，墩柱式沿空留巷效果最好，墩柱既能保持较高强度，又具有良好的可缩性；矿压观测结果显示顶底板移近量最大为596mm，两帮移近量最大为299mm，能够保证沿空留巷的稳定性。

英文摘要：

In order to solve the problem short mining distance, slow driving speed, conflict of exploitation and mining of working face in Ji- ning No.2 Coal Mine,pier column pressure testing, mechanical model,theoretical calculations and field test methods were applied to put forward innovatively pier structure gob-side entry retaining.The results showed that the pier column could meet the strength requirements, the required for cutting the top pressure was 21.96 MPa.When the sand and stones weight ratio in steel pipe was 1.0 ： 1.6,the effect of pier column gob-side entry retainiuy was the best, the pier column not only could maintain a higher strength, but also had good scalability. The rock pressure observation showed that the maximum roof to floor convergence was 596 mm, the maximum rib to rib convergence was 299 mm, which could ensure the stability of gob-side entry retaining.