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    Stability Evaluation Model of a Tunnel Face Excavated by the Benching Method in a Soft Silty Clay Layer

    Source: International Journal of Geomechanics:;2021:;Volume ( 021 ):;issue: 004::page 04021022-1
    Author:
    Wantao Ding
    ,
    Han Wang
    ,
    Keqi Liu
    ,
    Minglei Hou
    ,
    Rui Chen
    DOI: 10.1061/(ASCE)GM.1943-5622.0001962
    Publisher: ASCE
    Abstract: With the increasing construction demand for tunnels in soft silty clay layers, it is important to effectively control the face stability of a tunnel. One of the key issues for maintaining face stability is addressing how to accurately obtain the limit support pressure of a tunnel face excavated by the benching method in a soft silty clay layer. Therefore, based on the limit equilibrium method, an improved three-dimensional face stability analysis model is presented in this paper considering the advancing support effect of small pipes. In the model, the sliding failure zone is formed by a log-spiral line. The upper load of the sliding failure zone is shaped by the gravity of the soil, and it can be calculated by a two-parameter elastic foundation beam model when an advanced small pipe is utilized. By comparing these results with the limit support pressure predicted by existing models, the improved model is shown to be reasonable. Finally, the influence of the soil parameters on the limit support pressure is also assessed. The proposed failure mechanism improves the stability analysis of the tunnel face excavated by the benching method in the soft silty clay layer.
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      Stability Evaluation Model of a Tunnel Face Excavated by the Benching Method in a Soft Silty Clay Layer

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4271308
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    • International Journal of Geomechanics

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    contributor authorWantao Ding
    contributor authorHan Wang
    contributor authorKeqi Liu
    contributor authorMinglei Hou
    contributor authorRui Chen
    date accessioned2022-02-01T00:21:06Z
    date available2022-02-01T00:21:06Z
    date issued4/1/2021
    identifier other%28ASCE%29GM.1943-5622.0001962.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4271308
    description abstractWith the increasing construction demand for tunnels in soft silty clay layers, it is important to effectively control the face stability of a tunnel. One of the key issues for maintaining face stability is addressing how to accurately obtain the limit support pressure of a tunnel face excavated by the benching method in a soft silty clay layer. Therefore, based on the limit equilibrium method, an improved three-dimensional face stability analysis model is presented in this paper considering the advancing support effect of small pipes. In the model, the sliding failure zone is formed by a log-spiral line. The upper load of the sliding failure zone is shaped by the gravity of the soil, and it can be calculated by a two-parameter elastic foundation beam model when an advanced small pipe is utilized. By comparing these results with the limit support pressure predicted by existing models, the improved model is shown to be reasonable. Finally, the influence of the soil parameters on the limit support pressure is also assessed. The proposed failure mechanism improves the stability analysis of the tunnel face excavated by the benching method in the soft silty clay layer.
    publisherASCE
    titleStability Evaluation Model of a Tunnel Face Excavated by the Benching Method in a Soft Silty Clay Layer
    typeJournal Paper
    journal volume21
    journal issue4
    journal titleInternational Journal of Geomechanics
    identifier doi10.1061/(ASCE)GM.1943-5622.0001962
    journal fristpage04021022-1
    journal lastpage04021022-13
    page13
    treeInternational Journal of Geomechanics:;2021:;Volume ( 021 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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