工程地质学报2016，Vol.24Issue(1)：56-63,8.DOI:10.13544/j.cnki.jeg.2016.01.007
基于DFOS的苏州第四纪沉积层变形及地面沉降监测分析
DFOS-BASED MONITORING ON QUATERNARY SEDIMENTS DEFORMATION AND LAND SUBSIDENCE IN SUZHOU,CHINA
摘要
Abstract
Loose Quaternary deposits are widely distributed in Suzhou,where extracting groundwater has caused a large-scale land subsidence.The land subsidence influences the development of economy.Optical fibers are laid in a 200m borehole drilled in Shengze,Suzhou.Based on the BOTDR and FBG technologies,the Quaternary sediments deformation and land subsidence are long-term monitored.It is showed that Quaternary sediments can be divided into different aquifers(Af)and aquitards(Ad).The main compaction occurs at two thick aquitards which adjacent to the second confined aquifer.In addition,the shorter the distance between the aquitard and the pumping aquifer is,the greater the degree of compression of the aquitard is .The soil layer reaches the maximum compression in summer while a small rebound occurs in winter,showing the conformance with the pore water pressure of the pumping aquifer.We define the compression degree as the ratio of the accumulative compression and the thickness of this layer(i.e.,the unit compression).At this stage the subsidence trend can be judged by compression degree. For the aquitards,there is a tendency shows that Ad2 >Ad3 >Ad4 >Ad1.For the aquifers,the Af2 is the main compaction layer while Af1 and Af3 remain almost constant.DFOS technique provides a very advanced monitoring method for the study of land subsidence mechanism and the evaluation of soil compression deformation potential.关键词
地下水抽取/地面沉降/第四纪沉积层/分布式光纤监测/压缩度Key words
Groundwater withdrawal/Land subsidence/Quaternary sediments/Distributed fiber optic monitoring/Compression degree分类
天文与地球科学引用本文复制引用
吴静红,姜洪涛,苏晶文,施斌..基于DFOS的苏州第四纪沉积层变形及地面沉降监测分析[J].工程地质学报,2016,24(1):56-63,8.基金项目
国家自然科学基金重点项目(No.41230636),国家自然科学基金项目(No.41372265),地质矿产调查评价专项(1212011220002)资助. （No.41230636）
