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膨胀岩土地层修建盾构隧道引起的局部膨胀荷载研究

DOI: 10.3969/j.issn.1674-0696.2013.04.22, PP. 636-641

Keywords: 膨胀地层,盾构隧道,膨胀力,衬砌结构,膨胀荷载,expansiveground,shieldtunnel,expansiveforce,liningstructure,expansionload

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Abstract:

:?从理论上推导了岩土局部膨胀引起的附加膨胀荷载计算公式;结合数值分析方法,研究了不同位置、不同范围发生地层局部膨胀对衬砌结构接触压力增量的影响。结果表明:膨胀荷载与岩土膨胀力大小、应力水平、地层抗力、膨胀后岩土物性参数等因素有关,因地层局部膨胀引起的衬砌结构承受附加膨胀荷载值小于室内测得的膨胀力;岩土吸水膨胀后,地层抗力显著降低,对地层膨胀区及影响区隧道衬砌结构承受的荷载分布产生显著影响;若膨胀力较小,吸水后软化作用强于膨胀作用,会导致衬砌承受的荷载减小。

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