【作者】 马佳玉； 姜洪涛； 卢毅； 顾凯； 施斌；

【Author】 MA Jiayu;JIANG Hongtao;LU Yi;GU Kai;SHI Bin;School of Earth Sciences and Engineering,Nanjing University;School of Geographic and Oceanographic Science,Nanjing University;Key laboratory of Earth Fissures Geological Disaster,Ministry of land and Resource,Geological Survey of Jiangsu Province;

【机构】 南京大学地球科学与工程学院； 南京大学地理与海洋科学学院； 国土资源部地裂缝地质灾害重点实验室江苏省地质调查研究院；

【摘要】 地面沉降是目前长江三角洲经济区最主要的一种地质灾害。随着苏锡常地区地下水的全面禁采,目前土体的压缩变形主要来自弱透水层。本文以无锡市锡山区光明村06号钻孔为例,采用压汞试验（MIP）对钻孔土样中的孔隙分布进行了分析,研究了黏性土中的孔隙与地面沉降之间的关系;根据MIP的孔隙分析结果,提出了团粒间孔隙比e_mip的概念,并将此作为评价弱透水层压缩潜力的指标;采用这一指标,对该钻孔中的弱透水层的地面沉降潜力进行了评价。地面沉降潜力由大到小依次为:第Ⅰ-1弱透水层、第Ⅱ弱透水层、第Ⅰ-2弱透水层、第Ⅰ-3弱透水层。这一结果与土样压缩参数及扫描电镜（SEM）的微观结构分析结果完全一致,是判定弱透水层地面沉降压缩潜力行之有效的一种方法。更多还原

【Abstract】 Land subsidence is one of most main geological disasters in the Yangtze river delta economic region.With the ban of Suzhou-Wuxi-Changzhou area groundwater exploitation,the mainly compression deformation of soil is from aquitard at present.This paper took the No.06 drilling from Guangming village,Wuxi city,for an example.The pore size distribution of soil was analyzed based on mercury intrusion porosimetrytest and the relation between the pore of cohesive soil and land subsidence was studied.According to the result of mercury intrusion porosimetry,an evaluation method of aquitard compression potential was proposed using the concept of macro-pore porosity e_mip.The index e_mip-can evaluate the compression potential of aquitard.The potential of aquitard compression shows a tendency:Ⅰ-1 aquitard > Ⅱ aquitard >Ⅰ-2 aquitard >Ⅰ-3 aquitard.The result is consistent with the compression parameter and the microstructure of soil samples.So it is a effective way to evaluate the compression potential of aquitard stratum.更多还原