基于收敛-约束法的预衬砌支护适用性研究

发布时间：2018-01-04 07:31

本文关键词：基于收敛-约束法的预衬砌支护适用性研究　出处：《现代隧道技术》2017年04期 　论文类型：期刊论文

【摘要】：有效控制掌子面超前核心土的预收敛变形是控制软弱围岩变形的重要措施,采用机械预切槽技术施作形成的横向连续壳体的预衬砌支护能够起到保护超前核心土的作用,从而控制预收敛变形。由于掌子面处时空效应的影响,预衬砌支护与围岩间的相互作用过程十分复杂。根据收敛-约束法的基本原理,文章推导出了预衬砌与围岩相互作用荷载的理论求解方法,并基于安全性对预衬砌适用埋深随混凝土强度、围岩参数、预衬砌支护参数的变化进行了研究。研究结果表明:预衬砌混凝土抗压强度越大,预衬砌适用埋深越大,混凝土抗压强度与适用埋深基本呈线性关系;随着应力释放系数的增大,同一混凝土抗压强度条件下的预衬砌适用埋深增加;预衬砌厚度对预衬砌适用埋深具有显著的影响,预衬砌厚度越厚,预衬砌适用埋深越大;隧道直径减小时预衬砌的适用埋深增加。
[Abstract]:Pre convergence effectively control the face ahead of the core soil deformation is an important measure to control the deformation of soft rock, the horizontal continuous shell adopts mechanical pre cutting technology for the formation of the pre lining can play a protective role ahead of the core soil, so as to control the pre convergence deformation. Influenced by the face to space-time effect. The pre lining and the interaction process between the surrounding rock is very complicated. According to the basic principle of the convergence confinement method, this paper derives the theoretical method for solving interaction pre load of lining and surrounding rock, and the safety of pre application depth with lining concrete strength, based on the parameters of surrounding rock, the change of pre lining support parameters are the study results indicated that pre lining concrete compressive strength is greater, the greater the depth for the pre lining, concrete compressive strength and the suitable depth has a linear relationship with the stress releasing coefficient; With the increase of the same concrete compressive strength, the embedment depth of the pre lining increases, and the pre lining thickness has a significant effect on the depth of the pre lining. The thicker the lining is, the greater the embedment depth of the pre lining will be, and the diameter of the tunnel will decrease, and the application depth of the pre lining will increase.

【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金项目(51178026)
【分类号】：U455
【正文快照】： 1前言的,预衬砌在掌子面前方与围岩产生相互作用[6],如图隧道施工中软弱围岩的变形难以控制,如何有1所示,这跟传统隧道开挖支护具有明显的不同。由于隧道开挖过程中掌子面附近力学特性十分效地解决软弱围岩的变形问题是工程界面临的重要复杂[7],为了指导预衬砌支护参数的设计,

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