【摘要】 天津西青区持续超采地下水已引起严重的地面沉降。以分层标监测数据和水位长观数据对沉降层位进行分析,结合地层固结特征以及黏性土物理力学性质,得出辛口镇第Ⅱ含水组及以上地层压缩受地下水开采影响较小,沉降较小;第Ⅲ含水组多年来持续超采,水位埋深已远超过该层临界水位,地层持续压缩沉降,地下水位恢复至临界水位以上后,地面沉降速率减缓;第Ⅳ含水组水位埋深低于临界水位,且该层黏性土具有较高的含水量和孔隙比,地下水持续超采产生的沉降量较大;第Ⅴ含水组水位基本平稳,有小幅回升,对应地层匀速小幅沉降。上述研究可为西青区控沉工作提供理论基础。更多还原

【Abstract】 The continuous excessive mining of groundwater has caused serious land subsidence in Xiqing. The monitoring data of water marks and long-term data of water levels were used to analyze the subsidence level and the consolidation characteristics of the formation and the physical and mechanical properties of cohesive soil. The first No.2 aquifer in this area was less affected by groundwater exploitation and settlement was less. Over years of continuous exploitation of the No.3 aquifer, water depth had exceeded the critical water level and stratigraphic continuous compression settlement had occurred. The land subsidence rate decreased after the groundwater level returned to above the critical level. The No.4 aquifer water depth had exceeded the critical water level and the soil contained a high water content and void ratio. The settlement of groundwater exploitation was high. The No.5 aquifer was stable with a slight improvement, which corresponded to the formation of a uniform settlement. This research can provide the theoretical basis for sinking control work in Xiqing.更多还原