使用分层标对不同层位不同岩性地层进行地面沉降分层监测是进行地面沉降规律与机理研究的重要方法。 以天津市西青区辛口镇分层标为例, 对2005 年- 2009 年地面沉降分层监测数据进行了分析, 发现研究区潜水- 微 承压、第ò 、第ó 含水层沉降量呈逐年减小趋势; 潜水- 微承压含水层及第? 承压含水层沉降量与本层地下水开采 关系较小, 其沉降量主要由介质弹性形变量组成; 第? 承压含水层仍处于匀速沉降阶段, 第ò 、ó 含水层削减开采量 未对本层沉降起到抑制作用。研究结果可以为地下水开采布局调整提供依据。

Use of bo rehole benchmark is an impo rtant metho d to investig ate the mechanism of la yered land subsidence in differ ent st ratums. In this paper, the lay er ed mo nitor ing land subsidence data in Xinkou, Xiqing dist rict of T ianjin City between 2005 and 2009 w ere analyzed. T he r esults show ed that t he settlements of phreatic2feeble confined aquifer , the No. II, and No . III confined aquifers decr ease annually ; the settlements of phreatic2feeble confined aquifer and the No . I confined aquifer have insig nificant relat ionship with t he exploitation quantit y, and they ar e mainly caused by elastic defo rmatio n; the settlements of the No. IV con2 fined aquifer ar e st ill increasing unifo rmly and the reduction of ex plo itatio n quant ity in the No. II and No. III co nfined aquifer s cannot help r est rain the settlements of the No . IV aquifer. The r esults can pro vide refer ence fo r the distr ibutio n adjustment of gr oundwat er ex ploitat ion in this area.