北京新航城地区地面沉降演化规律及多源监测方法对比研究

为查明北京新航城地区地面沉降演化规律，结合基岩标-分层标和水准测量对新航城地区地面沉降特征进行了分析，并结合不同监测方法进行了对比研究评价。研究发现:①近十年新航城地区浅部地层中沉降量和沉降比例越来越小，沉降比例由2009年67.62%下降到2019年19.69%，而中部地层和深部地层则随着时间沉降量和沉降比例越来越大，中部地层沉降比例由2009年21.39%增加到2019年35.83%，深部地层沉降比例则由2009年10.99%增加到2019年44.48%；浅部地层含水层水位呈现周期性往复变化，中部和深部地层含水层在周期性变化中持续下降，地层在水位周期性往复变化中持续压缩。②根据历年水准测量和地下水动态监测成果，研究区自北向南累计沉降量逐渐减小。地面沉降和地下水位数据拟合后发现二者具有一定的相关性，相关性随着水位降幅的增大，相关性也随之增大，二者成正相关。③基岩标—分层标静力水准测量系统与人工水准测量系统对同一监测点和不同深度数据互校后的误差值非常接近，符合正态分布规律，不同深度的监测数据相关系数为0.993 6；对比2种方法各有优势与不足，应根据实际情况，多方面获取沉降信息与数据，满足地区级地面沉降监测与防治的不同需求。 

Evolution of land subsidence and comparative study on multi-source monitoring methods in New Airlines City of Beijing

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.