采空区边缘回风巷合理位置的研究

采空区下方煤柱边缘薄顶煤巷道锚网支护存在诸多难点，通过采空区边缘支承压力分布规律的分析，设计了五种回风巷位置与支护方案，应用数值模拟研究了不同位置巷道围岩的变形及受力特征，探讨了在不同位置开挖回风巷对围岩稳定性的影响。研究表明：在采空区内侧低应力区内，距离采空区边缘5m开挖巷道位移量较小，可以对较薄顶板进行锚网支护，使顶板岩体和锚网共同承担上部压力，从而有利于围岩变形、塑性区发育的控制，提高了围岩稳定性和强度。

STUDY ON REASONABLE POSITION OF AIR-RETURN ROADWAY NEAR THE EDGE OF GOAF

There are a few distinct difficulties in support of roadway by bolt-mesh near the edge of coal seam with thin roof strata under the gob. Five different positions of air-return roadway and support are proposed through analyzing the distribution of the abutment pressure near the edge of goaf. By using numerical simulation, the deformation and stress distribution of the surrounding rocks in different positions of air-return roadway are studied and the influence to the surrounding rocks of the air-return roadway excavation in different positions is discussed. The study indicates that the deformation of the air-return roadway induced by excavation was reduced in the low-stress coal stratum about 5 meters inner the edge of goal. Moreover, the anchoring cables can be installed to bear the stress from upper strata with the roof, which is helpful for controlling the development of the plastic zones and the deformation, as well as increasing the stability of the air-return roadway.