北京平原区地面沉降水准监测网参考基准稳定性研究  

Reference datum stability of land subsidence leveling network in Beijing plain

作　　者：雷坤超 马凤山[1] 罗勇[2] 陈蓓蓓[3] 叶超[2] 崔文君[2] 周毅[4] LEI Kun-chao;MA Feng-shan;LUO Yong;CHEN Bei-bei;YE Chao;CUI Wen-jun;ZHOU Yi(Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Beijing Institute of Hydrogeology and Engineering Geology,Beijing 100195,China;College of Resources Environment and Tourism Capital Normal University,Beijing 100048,China;Beijing Geology Prospecting and Developing Bureau,Beijing 100195,China)

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]北京市水文地质工程地质大队,北京100195 [3]首都师范大学环境过程与数字模拟省部共建国家重点实验室培育基地,北京100048 [4]北京市地质矿产勘查开发局,北京100195

出　　处：《地球物理学进展》2019年第5期1757-1769,共13页Progress in Geophysics

基　　金：国家自然科学基金(41771455);北京市自然科学基金(8162043,8182013);北京市地面沉降监测系统年运行费项目(PXPXM2018_158305_000012)联合资助

摘　　要：地面沉降水准测量参考基准的合理选取对获取真实地表形变场信息至关重要.文中在充分收集、整理北京平原区7座深层基岩标历年水准测量资料基础上,系统分析了基岩标历年水准形变特征;探讨了水准测量累计误差对基岩标微小形变的影响;采用秩亏自由网平差算法联合平均间隙法和单点检验法,对7座深层基岩标稳定性进行定量评价,查找每期观测中位移变化显著点和相对稳定点,构建变形函数模型.研究表明:(1)7座深层基岩标所呈现出的微小形变量,受到多种复杂因素综合影响,基岩标形变量是其自身形变与测量误差耦合作用的结果,特别是长距离水准测量所产生的累计误差效应对其结果影响较大.(2)基岩标稳定性评价中,王四营站基岩标J1、望京J2、天竺J3、平各庄J5和张家湾J6这5座基岩标均呈相对稳定状态,可以作为区域地面沉降水准测量稳定参考基准点.(3)将评定的5座稳定基岩标纳入水准网中,联合玉渊潭水准原点,构建北京平原区地面沉降附合水准监测网,其平差结果与站内分层标之间Pearson相关系数均高于自由水准网,说明利用具有多个稳定起算基准的附合水准网代替以往自由水准网,可以有效降低自由网中沉降量不正常跳跃现象,使测量成果更符合地面沉降客观形变规律,提升监测精度.The reasonable selection of reference datum for land subsidence leveling network is very important for obtaining the real surface deformation. Based on collects and arranges multi-years leveling data of 7 bedrock bench marks in Beijing plain, the deformation characteristics of the bedrock bench marks and the influence of accumulative error of leveling has been analysed. And the stability of 7 bedrock marks is evaluated by using rank defect free network adjustment, mean spacing method and single point test method. Finding the moving points and relative stability points, and establish the deformation function model. The results showed that:(1)The micro deformation of 7 bedrock bench marks are affected by many factors. The deformation of bedrock bench marks is the result of the combination of self deformation and measurement error. Especially, the accumulative error of long distance leveling has great influence on its results.(2)In the stability evaluation of bedrock bench marks, Wangsiying J1, Wangjing J2, Tianzhu J3, Pinggezhuang J5 and Zhangjiawan J6 are all relatively stable, which can be used as the reference datum for the stability of land subsidence leveling.(3)Putting the 5 stable bedrock bench marks into the leveling network and combining Yu Yuan-Tan leveling origin, the annexed leveling network of land subsidence has been constructed in Beijing plain. The Pearson correlation coefficient between the results of the annexed leveling network and the step bench marks are higher than the free leveling network. The results show that the annexed leveling network with multiple stable benchmarks instead of the free leveling network can reduce the abnormal jumping phenomenon of the deformation, and make the measurement results more consistent with the objective deformation law of the land subsidence and improve the monitoring precision.

关 键 词：北京平原 地面沉降 水准测量 参考基准 稳定性评价 

分 类 号：P223[天文地球—大地测量学与测量工程]