Analysis of Uneven Settlement and Deformation of the Existing Railway under the Condition of Mined-out Area after Mining

Abstract

Due to the railway construction being ahead and the mining work being behind, it is inevitable for some mining areas to pass under the railway. However, at present, for the mining work face passes across under the railway there is a lack of research and evaluation on the deformation of the existing railway roadbed after the upper strata of the goaf were reinforced and repaired. Based on the deformation monitoring of roadbed after the 5301 mining face passed under the section form milepost DK1 290 to milepost DK2 755 of Gucheng Special Railway, the variation law of the uneven deformation of the existing railway roadbed on the goaf was studied. The research results indicated that the deformation in the transition area and the stable area of the existing railway roadbed was very small, while the subgrade deformation of the existing railway above the goaf was relatively large, and the maximum vertical displacement of railway subgrade was 7.8 cm within 3 months. According to the analysis of monitoring data, the deformation distribution law of existing railway subgrade above goaf was in shape of "V".