| Citation: | Liu He, Luo Yong, Lei Kunchao, Cui Wenjun, Qi Minghuan, Zhao Long, Kong Xiangru. Evolution of land subsidence and comparative study on multi-source monitoring methods in New Airlines City of Beijing[J]. Bulletin of Geological Science and Technology, 2023, 42(1): 398-406. doi: 10.19509/j.cnki.dzkq.tb20210456
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To reveal the evolution law of land subsidence in the New Airlines City of Beijing, the characteristics of land subsidence in this area are analyzed by combining bedrock standard-layered standard and leveling survey, and the comparative study and evaluation are carried out with different monitoring methods. The results show that: ①In recent ten years, the amount and proportion of subsidence in the shallow stratum of the Xinhangcheng area are smaller and smaller, the proportion of subsidence decreased from 67.62% in 2009 to 19.69% in 2019, while the amount and proportion of subsidence in the middle stratum and deep stratum are increasing with time, the proportion of middle stratum subsidence increased from 21.39% in 2009 to 35.83% in 2019, and the proportion of deep stratum subsidence increased from 10.99% in 2009 to 44.48% in 2019;the water level of the shallow aquifer changes periodically, while that of the middle stratum and deep aquifer decreases continuously, the strata continue to compress in the periodic change of water level. ②According to the results of the level survey and groundwater dynamic monitoring over the years, the accumulated settlement from north to south in the research area gradually decreases. After fitting the data of land subsidence and groundwater level, it is found that there is a certain correlation between them, the correlation increases with the increase of water level drop, and there is a positive correlation between them. ③The error value of the static leveling system of bedrock standard layered standard and artificial leveling system after mutual correction of the same monitoring point and different depth data is very close, which conforms to the normal distribution law, and the correlation coefficient of monitoring data of different depth is 0.993 6; comparing the two methods has advantages and disadvantages, it is suggested to obtain the settlement information and data in many aspects based on the actual situation, to meet the regional requirements different demands of the monitoring and prevention of the grade land subsidence.
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