DFOS-BASED MONITORING ON QUATERNARY SEDIMENTS DEFORMATION AND LAND SUBSIDENCE IN SUZHOU, CHINA

WU Jinghong; JIANG Hongtao; SU Jingwen; SHI Bin

doi:10.13544/j.cnki.jeg.2016.01.007

Volume 24 Issue 1

Feb. 2016

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WU Jinghong, JIANG Hongtao, SU Jingwen, SHI Bin. 2016: DFOS-BASED MONITORING ON QUATERNARY SEDIMENTS DEFORMATION AND LAND SUBSIDENCE IN SUZHOU, CHINA. JOURNAL OF ENGINEERING GEOLOGY, 24(1): 56-63. doi: 10.13544/j.cnki.jeg.2016.01.007

Citation:

WU Jinghong, JIANG Hongtao, SU Jingwen, SHI Bin. 2016: DFOS-BASED MONITORING ON QUATERNARY SEDIMENTS DEFORMATION AND LAND SUBSIDENCE IN SUZHOU, CHINA. JOURNAL OF ENGINEERING GEOLOGY, 24(1): 56-63. doi: 10.13544/j.cnki.jeg.2016.01.007

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DFOS-BASED MONITORING ON QUATERNARY SEDIMENTS DEFORMATION AND LAND SUBSIDENCE IN SUZHOU, CHINA

doi: 10.13544/j.cnki.jeg.2016.01.007

1.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023;
2.
School of Geographic and Oceanographic Science, Nanjing University, Nanjing 210023;
3.
Nanjing Center, China Geological Survey, Nanjing 210016

Funds:

Received Date: 2014-10-31
Rev Recd Date: 2015-04-01
Publish Date: 2016-02-25

Abstract

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.
- Groundwater withdrawal,
- Land subsidence,
- Quaternary sediments,
- Distributed fiber optic monitoring,
- Compression degree

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