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    Dewatering–Induced Building Settlement around a Deep Excavation in Soft Deposit in Tianjin, China

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2019:;Volume (0145):;issue:005
    Author:
    Yong-Xia Wu;Hai-Min Lyu;Jie Han;Shui-Long Shen
    DOI: doi:10.1061/(ASCE)GT.1943-5606.0002045
    Publisher: American Society of Civil Engineers
    Abstract: This case study presents an investigation on building settlement induced by dewatering for a deep excavation constructed in a deposit in Tianjin, China. The excavation site is located in the Tianjin urban center, around which there are many existing buildings. Geological conditions at the site involve a multiaquifer system with one phreatic aquifer over three confined aquifers. To maintain the stability of the bottom of the excavation, a cutoff wall was used to block groundwater seepage with large diameter wells to lower the groundwater level. Field instrumentation was installed during construction to monitor (1) the quantity of withdrawn groundwater, (2) the groundwater head, and (3) the settlement of surrounding buildings. The field observations yielded the following results and implications: (1) pumping of groundwater could lead to large building settlement and a large area of ground settlement; (2) most of the settlement caused by dewatering did not rebound; (3) the cutoff wall played a significant role in reducing the building settlement during dewatering; and (4) the dewatering-on-demand procedure should be implemented during excavation.
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      Dewatering–Induced Building Settlement around a Deep Excavation in Soft Deposit in Tianjin, China

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4257041
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    contributor authorYong-Xia Wu;Hai-Min Lyu;Jie Han;Shui-Long Shen
    date accessioned2019-06-08T07:24:14Z
    date available2019-06-08T07:24:14Z
    date issued2019
    identifier other%28ASCE%29GT.1943-5606.0002045.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4257041
    description abstractThis case study presents an investigation on building settlement induced by dewatering for a deep excavation constructed in a deposit in Tianjin, China. The excavation site is located in the Tianjin urban center, around which there are many existing buildings. Geological conditions at the site involve a multiaquifer system with one phreatic aquifer over three confined aquifers. To maintain the stability of the bottom of the excavation, a cutoff wall was used to block groundwater seepage with large diameter wells to lower the groundwater level. Field instrumentation was installed during construction to monitor (1) the quantity of withdrawn groundwater, (2) the groundwater head, and (3) the settlement of surrounding buildings. The field observations yielded the following results and implications: (1) pumping of groundwater could lead to large building settlement and a large area of ground settlement; (2) most of the settlement caused by dewatering did not rebound; (3) the cutoff wall played a significant role in reducing the building settlement during dewatering; and (4) the dewatering-on-demand procedure should be implemented during excavation.
    publisherAmerican Society of Civil Engineers
    titleDewatering–Induced Building Settlement around a Deep Excavation in Soft Deposit in Tianjin, China
    typeJournal Article
    journal volume145
    journal issue5
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doidoi:10.1061/(ASCE)GT.1943-5606.0002045
    page05019003
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2019:;Volume (0145):;issue:005
    contenttypeFulltext
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