Study on time-space deformation features of sand strata due to water injection in Huadong mining area

摘要

In order to control Quaternary loose layer settlement in East China, there are monitoring results based on the 3 water level observation holes and 7 sand layer of Fiber Bragg Grating (FBG) strain sensor.Under the conditions of upper group water injecting to lower group of loose layer, the deformation characteristics of upper, middle and lower group of loose sandy soil layer changing with time and relationship with the water level are studied.The constitutive relation of stress-strain is also studied at different sand layers.Research results show that using water injecting from upper group into lower group of loose layer can ease the loose layer compression deformation.With the water level dropped, in East China soil creep deformation occurred, which accord with viscoelasto plastic model.The deformation of lower sand group has clear later effect and no direct relationship with water level.The results provide an important basis for the study East China stratum settlement model and water management.