Deformation law and control of highway subgrade in Goaf residual deformation

• Published in: IOP conference series. Earth and environmental science Vol. 526; no. 1; pp. 12213 - 12220
• Main Authors: Jia, Xinguo, Wu, Zuoqi, Chen, Qingtong
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.06.2020
• Subjects: Deformation; Excavation; Mining; Overburden; Road beds; Roofs; Subgrades; Uplift
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/526/1/012213

Based on the geological conditions of Liuzhuangzi mining area, the influence of the depth of burial in different goaf areas on the overburden and the ground deformation of the expressway is studied. The conclusion is drawn that the influence of different mining depth on the deformation and settlement of surface roadbed In the same way, the mined-out area is divided into three parts for excavation. The shape of the affected area of the goaf is mainly centrally symmetrical, and the mined-out area formed after each step The stress and sedimentation are the largest in the mined-out area, which is smaller and smaller from the mined-out area and forcing the large area of the rock to sink, and the bottom plate is generated. Small up the uplift, in the third step after the excavation of 15000 steps not only the bottom plate upwards uplift, and the roof slump, the maximum settlement in the roof in the first step mining only 7.12mm, the second step to achieve mining 17.98mm, while the third step mining reached 38.24mm, more than the previous two settlement of about 437.08% and 112.68%, overlying road subgrade and road surface deformation with the increase in mining area increases