常州地区含水层系统土层压缩变形特征研究

A study of soil deformation properties of the groundwater system in the Changzhou area

根据近十几年来分层标和含水层水位观测资料分析了常州地区土层压缩变形特征,表明承压含水砂层中的压缩变形不容忽视,且含水砂层的压缩变形与弱透水层的粘土、粉质粘土相似,均表现出明显的变形滞后现象。为此从水位与时间关系、土层变形与时间关系和水位与变形关系出发,结合室内试验方法,通过选取常州地区含水层系统中第一、二、三承压含水层以及二、三承压含水层间弱透水层和第三承压含水层下覆弱透水层的原状土样,采用单轴侧限压缩试验,分析了常州地区砂土和粉质粘土的次固结(蠕变)特性。试验结果表明常州地区不论是粉质粘土还是砂土,均存在一定的次固结变形,从而启示我们该地区地面沉降模拟中应同时考虑含水砂层的蠕变特性。

Based on data from layered marks and observation wells in the Changzhou region, soil deformation properties in the area are analyzed in this paper. The results indicate that the compaction of the sandy soil cannot be ignored. In order to investigate the lag phenomena between the deformation in the land subsidence and the variation in water levels of the aquifer, the integrated data of the hydrographs of representative wells and relation of the deformation to time, relation of the deformation to the water levels and the results of laboratory tests are examined in this study. The second consolidation （creep） behaviors of both the sand and clayed soil are informations for both sand and clayed soil are due to the existence of secondary consolidation. The result also dem- onstrates that creep deformation of the sandy soil should be considered in the land subsidence model of this area.