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    Effect of Dewatering in a Confined Aquifer on Ground Settlement in Deep Excavations

    Source: International Journal of Geomechanics:;2018:;Volume ( 018 ):;issue: 010
    Author:
    Zhang Yang-Qing;Wang Jian-Hua;Li Ming-Guang
    DOI: 10.1061/(ASCE)GM.1943-5622.0001233
    Publisher: American Society of Civil Engineers
    Abstract: Dewatering must be conducted for shallow confined aquifers located below deep excavations. However, its effects on ground settlement remain unclear, due to the complicated seepage and stress condition of the strata. In this study, a coupled numerical method was adopted to study the effects of dewatering in a confined aquifer on ground settlement during excavation. A hypothetical excavation model depicting the soil layers that are typical in Shanghai was developed in a finite difference software. Excavation and dewatering in a confined aquifer were simulated. The numerical results were analyzed in association with those of an identical excavation in which the confined aquifer was removed through modification of its hydraulic conductivity. Comparative results showed that dewatering in the confined aquifer during excavation aggravates ground surface settlements, especially for the ground surface twice the maximum excavation depth (2 He) behind the wall, where He was the excavation depth. The dewatering-induced settlement beyond 2 He showed a similar profile as groundwater drawdown in the confined aquifer owing to the insignificant deformations of the strata above the confined aquifer. However, the settlement profile within 2 He was inconsistent with the drawdown profile, due to the effects of unloading inside the excavation and soil-wall interaction. At the end of excavation, the confined aquifer was significantly compressed due to dewatering. However, it was found that the aquitard above the confined aquifer expanded dramatically with its maximum expansion located near .5 He. This may be attributed to the local soil arch and insignificant consolidation in the aquitard. Additionally, postexcavation pumping resulted in significant compression of the aquitard and further aggravate the ground surface settlement.
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      Effect of Dewatering in a Confined Aquifer on Ground Settlement in Deep Excavations

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    contributor authorZhang Yang-Qing;Wang Jian-Hua;Li Ming-Guang
    date accessioned2019-02-26T07:43:13Z
    date available2019-02-26T07:43:13Z
    date issued2018
    identifier other%28ASCE%29GM.1943-5622.0001233.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4248915
    description abstractDewatering must be conducted for shallow confined aquifers located below deep excavations. However, its effects on ground settlement remain unclear, due to the complicated seepage and stress condition of the strata. In this study, a coupled numerical method was adopted to study the effects of dewatering in a confined aquifer on ground settlement during excavation. A hypothetical excavation model depicting the soil layers that are typical in Shanghai was developed in a finite difference software. Excavation and dewatering in a confined aquifer were simulated. The numerical results were analyzed in association with those of an identical excavation in which the confined aquifer was removed through modification of its hydraulic conductivity. Comparative results showed that dewatering in the confined aquifer during excavation aggravates ground surface settlements, especially for the ground surface twice the maximum excavation depth (2 He) behind the wall, where He was the excavation depth. The dewatering-induced settlement beyond 2 He showed a similar profile as groundwater drawdown in the confined aquifer owing to the insignificant deformations of the strata above the confined aquifer. However, the settlement profile within 2 He was inconsistent with the drawdown profile, due to the effects of unloading inside the excavation and soil-wall interaction. At the end of excavation, the confined aquifer was significantly compressed due to dewatering. However, it was found that the aquitard above the confined aquifer expanded dramatically with its maximum expansion located near .5 He. This may be attributed to the local soil arch and insignificant consolidation in the aquitard. Additionally, postexcavation pumping resulted in significant compression of the aquitard and further aggravate the ground surface settlement.
    publisherAmerican Society of Civil Engineers
    titleEffect of Dewatering in a Confined Aquifer on Ground Settlement in Deep Excavations
    typeJournal Paper
    journal volume18
    journal issue10
    journal titleInternational Journal of Geomechanics
    identifier doi10.1061/(ASCE)GM.1943-5622.0001233
    page4018120
    treeInternational Journal of Geomechanics:;2018:;Volume ( 018 ):;issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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