防灾减灾工程学报2018，Vol.38Issue(1)：81-86,93,7.DOI:10.13409/j.cnki.jdpme.2018.01.011
苏州地面沉降区土层微观结构和宏观力学性质分析
The Analysis of the Microstructure and the Mechanical Properties of Land Subsidence Area in Suzhou
摘要
Abstract
The land subsidence is one of the main geological disaster in Suzhou,China.Owing to long-term extraction of groundwater,the land subsidence area has continuously extended which hinders the development of local economy.A series of experiments have been carried out in this study.In order to study the mechanism of land subsidence,the experiment combines the quantitative analysis of soil microstructure with the macroscopic mechanical test,and the soil samples were taken from a 200m borehole in Shengze,Suzhou.A larger number of SEM images were obtained after using the method of vacuum freeze-drying.The imaging analysis software PCAS was used to acquire the parameters of soil microstructure and the fiber Bragg grating (FBG) techniques were used to monitor the soil layers in the borehole.The data in liquid and plastic limit tests,quick consolidated tests,the quantitative analysis of microscopic structure and the data of distributed fiber optic sensing indicate that the moisture content,the liquid index and the compression coefficient get smaller and the microstructure orientation become more obvious with the depth of strata increasing.There is a large number of microscopic pore structures in the waterbearing sand layer of the second confined and the volume is big enough,which causes a great potential of subsidence in the future and this remains to be investigated.关键词
地面沉降/微观结构/力学性质/PCASKey words
land subsidence/microstructure/mechanical property/PCAS分类
建筑与水利引用本文复制引用
顾颖凡,刘春,施斌,吴静红,周春慧..苏州地面沉降区土层微观结构和宏观力学性质分析[J].防灾减灾工程学报,2018,38(1):81-86,93,7.基金项目
国家自然科学基金项目(41230636,41302216,41502274)、苏州市科技计划项目(SYG201614)资助 （41230636,41302216,41502274）
