为进一步提高综采工作面末采回撤速度、降低搬家费用，采用理论计算、数值模拟、现场试验相结合的方法对混凝土支柱配合预掘回撤通道锚杆（索）联合支护系统在工作面末采期间的应用进行了研究分析。研究结果表明：双排布置250个直径800 mm混凝土支柱可以替代垛式支架实现对主回撤通道的外部有效支护，但需做好支柱接顶处理工作；当工作面回采至剩余煤柱宽10 m时，回撤通道两侧煤体及混凝土支柱出现明显的垂直应力集中，当工作面与主回撤通道贯通时，4种不同布置方案下支柱最大压应力可达30.45 MPa，最大拉应力可达0.60 MPa，靠近工作面侧支柱受力明显大于远离工作面侧，且靠近工作面侧支柱易出现不同程度的塑性破坏状态，尤其是支柱接顶板、接底板部分段更易出现剪切变形而发生失稳破坏。综合模拟结果、施工工序、施工成本等因素，井下试验选择采用间距1.8 m、排距2 m布置方案，试验结果表明混凝土支柱与锚杆（索）联合支护系统可以有效控制回撤通道顶板下沉，混凝土支柱依靠接顶高密度板的变形让压而保持较好的完整性，充分保证了设备回撤空间，为类似条件下工作面设备回撤提供工程借鉴。

In order to further improve the recovery speed at the end of fully-mechanized mining face and reduce the moving cost of the fully-mechanized working face, the method of combining theoretical calculation, numerical simulation and field test was used for preliminary application researches on the concrete pillar support system combined with anchored bolts and cables of the pre-driven recovery room at the end of the working face. The theoretical calculation results show that the double-row layout of 250 concrete pillars with the diameter of 800 millimeters can replace the stacking supports to achieve effective external support for the main retraction channel, but the pillar top treatment needs to be done well. When the working face is mined to the remaining coal pillar 10 m, the coal body and concrete pillars on both sides of the retraction channel have obvious vertical stress concentration. When the working face is connected with the main retreat channel, the maximum compressive stress of the pillars under the four different layout schemes can reach 30.45 MPa, and the maximum tensile stress can reach 0.60 MPa. The stress of the pillars near the working face is obviously greater than that of the side away from the working face. The pillars near the working face are prone to different degrees of plastic failure, especially the shear deformations and instability failure were more likely to occur at the top and the bottom of the pillars. The layout scheme with the inter-row spacing of 1.8 m and 2 m was finally determined in consideration of the simulation results, construction procedures and construction costs. The test results show that the combined support system of concrete pillars and anchor rods (cables) could effectively control the bottom of the roof of the retraction channel. The concrete pillars maintain good integrity by virtue of the deformation and pressure of the high-density board connected to the top, which fully guarantees the equipment retraction space and provides engineering reference for the retraction of the working face equipment under similar conditions.