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为了研究中断面黄土隧道的开挖施工方法,本文借助有限元软件和抗剪强度折减法,对中断面黄土隧道的四种施工方法(全断面法、上下台阶法、台阶分部法和CD法)进行了有限元数值模拟,并获得了中断面黄土隧道施工中的抗剪强度安全系数。结果表明:对于中断面黄土隧道,CD法的施工安全系数最大,全断面法的施工安全系数最小,因此,对于中断面黄土隧道,建议采用CD法进行施工。
In order to study the construction method of loess tunnel with broken section, four construction methods of loess tunnel with broken section (full section method, step-by-step method, step-by-step method and CD method are used in this paper with finite element software and shear strength reduction method) ) Were simulated by finite element method, and the safety factor of shear strength in loess tunnel construction was obtained. The results show that for the loess tunnel with discontinuous section, the CD method has the largest construction safety coefficient and the full section method has the lowest construction safety coefficient. Therefore, CD method is recommended for the loess tunnel with broken section.