Study on the Geological Conditions of Deep Foundation Pit Engineering for Air Well in Granite Areas
In order to study the characteristics of surface subsidence and deformation in deep goaf areas adjacent to the high-speed railway,taking the Lunan high-speed railway as an example,a multi-source monitoring network was arranged for key sections using methods such as INSAR interpretation,surface leveling,groundwater monitoring,and structural automation monitoring.The multi-dimensional,high-precision,and full-time monitoring of surface deformation in goaf areas was achieved,and the law of surface subsidence and deformation in ultra deep goaf areas was analyzed.The coupling relationship between surface deformation and structural deformation was obtained.The results show that:The surface subsidence of the Gucheng coal mine section is mainly caused by the goaf,and the surface deformation of the goaf is characterized by a"bowl shaped"shape centered around the goaf and radiating towards the surrounding areas.INSAR interprets the trend of surface subsidence as consistent with the formation of the goaf in terms of"time space".The subsidence center moves with the direction of goaf excavation,and exhibits a pattern of large settlement in the early stage and small settlement in the later stage.According to surface level monitoring,the boundary angle of rock movement is calculated to be 58.1°～59.5°,which is basically consistent with the boundary angle of 60° for retaining protective coal pillars.The rationality of rock movement parameter values has been verified.During the operation stage,the deformation of the online structure is-6～4 mm,which is significantly consistent with surface deformation.The research results provide reference for similar research in other projects.
high-speed railwayultra deep goafINSAR interpretationdeformation monitoringautomation monitoring
NETL
NSTL
万方数据
