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    Estimation of Shaft Radial Displacement beyond the Excavation Bottom before Installation of Permanent Lining in Nondilatant Weak Rocks with a Novel Formulation

    Source: International Journal of Geomechanics:;2017:;Volume ( 017 ):;issue: 009
    Author:
    Giovanni Spagnoli
    ,
    Pierpaolo Oreste
    ,
    Luigi Lo Bianco
    DOI: 10.1061/(ASCE)GM.1943-5622.0000949
    Publisher: American Society of Civil Engineers
    Abstract: The convergence-confinement method (CCM) applies to circular tunnels in in situ stress fields in which all three principal stresses are equal and the rock mass exhibits elastic-perfectly plastic shear failure. As radial wall displacement cannot be obtained easily using analytical methods, extensive parametric analysis of bidimensional numerical modelling to investigate the strain of the shaft wall close to the excavation bottom was performed. In all, 81 cases were derived from combinations of geometrical parameters and three weak rock categories. Through processing data relating to values of uR0 (radial displacement of the shaft wall at the excavation bottom) obtained by numerical calculation in the different cases studied, it was possible to calculate the uR0/R ratio as a function of the lithostatic stress p0, the lining thickness s, and the shaft radius R. Novel equations were obtained to quickly estimate the value of uR0 given the thickness of the lining concrete, the shaft depth, and the shaft radius for the qualities of rock considered.
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      Estimation of Shaft Radial Displacement beyond the Excavation Bottom before Installation of Permanent Lining in Nondilatant Weak Rocks with a Novel Formulation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4239878
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    • International Journal of Geomechanics

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    contributor authorGiovanni Spagnoli
    contributor authorPierpaolo Oreste
    contributor authorLuigi Lo Bianco
    date accessioned2017-12-16T09:12:11Z
    date available2017-12-16T09:12:11Z
    date issued2017
    identifier other%28ASCE%29GM.1943-5622.0000949.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4239878
    description abstractThe convergence-confinement method (CCM) applies to circular tunnels in in situ stress fields in which all three principal stresses are equal and the rock mass exhibits elastic-perfectly plastic shear failure. As radial wall displacement cannot be obtained easily using analytical methods, extensive parametric analysis of bidimensional numerical modelling to investigate the strain of the shaft wall close to the excavation bottom was performed. In all, 81 cases were derived from combinations of geometrical parameters and three weak rock categories. Through processing data relating to values of uR0 (radial displacement of the shaft wall at the excavation bottom) obtained by numerical calculation in the different cases studied, it was possible to calculate the uR0/R ratio as a function of the lithostatic stress p0, the lining thickness s, and the shaft radius R. Novel equations were obtained to quickly estimate the value of uR0 given the thickness of the lining concrete, the shaft depth, and the shaft radius for the qualities of rock considered.
    publisherAmerican Society of Civil Engineers
    titleEstimation of Shaft Radial Displacement beyond the Excavation Bottom before Installation of Permanent Lining in Nondilatant Weak Rocks with a Novel Formulation
    typeJournal Paper
    journal volume17
    journal issue9
    journal titleInternational Journal of Geomechanics
    identifier doi10.1061/(ASCE)GM.1943-5622.0000949
    treeInternational Journal of Geomechanics:;2017:;Volume ( 017 ):;issue: 009
    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
    yabeshDSpacePersian