关键词: 巷道断面形状, 倾斜煤层, 半煤岩巷, 沿空掘巷

Abstract: In order to reveal the influence of different excavation section shapes on the stability of surrounding rock of the gob-side coal-rock roadway in inclined coal seam and further guide the optimization design of this kind of roadway. Based on numerical simulation, the surrounding rock plastic zone distribution and deformation characteristics are studied after the excavation of three kinds of type roadway section, including inclined roof echelon, vertical wall semicircle arch and inclined wall arc roof. The result show that: comparaed with the inclined roof echelon and straight wall semi-circular arch, the excavation of the inclined wall arc roof is more benefical to the surrounding rock deformation control of the gob-side coal-rock roadway in inclined seam; The influence of excavation on surrounding rock deformation and damage is different for inclined wall arc roof of roadway with different angle of outward and the inclined wall arc roof with an outward 10° had the smallest deformation of the surrounding rock after excavation, which was the relatively ideal roadway section shape. Based on the above results, it was determined that the 1511 return air roadway of a mine in Guizhou province was excavated with inlined wall (10°) arc roof.The laser roadway section detector was used to detect the deformation of the whole roadway section during the service period, the maximum shrinkage rate of section is 23.3%, and the overall uniform deformation of roadway further verifies the reliability of the research results.