基于强度折减法的中断面黄土隧道施工方法研究

摘要

In order to study the excavation construction method about middle cross-section loess tunnel, the finite element analysis method and the shear strength reduction method are used to simulate the middle cross-section loess tunnel aiming to four construction technologies that are the full section method, up and down step method, stage division method and CD method, and then the shear safety factors are gotten. The results show that -.for the middle cross-section loess tunnel, the safety factor is largest by the CD method, and is the smallest by the full section method. Certainly the CD method is advised for the construction of middle cross-section loess tunnel.%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.