电力隧道先隧后井施工中简易井应用的若干问题研究

发布时间：2018-01-17 02:34

本文关键词：电力隧道先隧后井施工中简易井应用的若干问题研究　出处：《岩石力学与工程学报》2014年S2期 　论文类型：期刊论文

【摘要】：针对电力隧道,提出一种无内支撑、节约高效的圆形简易工作井建设思路,开展简易工作井与常规方案对比分析,借助有限元法分析开口环管片变形对简易工作井参数的敏感性,探讨简易工作井结构设计中的关键技术。研究结果表明:简易工作井施工工艺、可行性及对周围环境影响等方面均优于常规工作井,其造价仅为常规方案的7%,极大节约了成本。简易工作井施工过程中,局部管片破除形成了开口的非稳定结构,导致管片变形显著增大,影响范围主要体现在开口环及其两侧2环管片上,故施工时需对开口环及影响明显的4环管片设置临时支撑,以确保结构安全稳定。管片变形受工作井壁厚与周围软弱土层影响显著,其中最大位移值随井壁厚度的增加近似呈二次方增长,而井的直径与管片开口环数则对管片变形影响较小,工作井尺寸应在满足整体刚度与净空要求的前提下不宜取大。
[Abstract]:In view of the power tunnel, presents a simple circular inner support, working well construction of economical and high efficiency, simple work well and carry out comparative analysis of the conventional solution, with the help of finite element analysis of split ring segment deformation sensitivity to work well parameters, discuss the key technology work well in structural design. The results show that: simple work well the construction process, the feasibility and impact on the surrounding environment was better than the routine work well, the cost is only 7% of the conventional scheme, greatly saves the cost. Work well in the construction process, get rid of the segment to form a non stable structure of opening, resulting in segment deformation increased significantly and the influence scope is mainly reflected in the opening ring and both sides of the 2 segment, so the construction should be set to 4 temporary support ring opening and ring effect, to ensure safe and stable structure. By segment deformation work well The wall thickness and the surrounding soft soil has significant influence on the maximum displacement value increased with the increase of the wall thickness was approximately two times growth, and the diameter and segment well opening ring number has little influence on the deformation of segment, working well size should meet the premise of stiffness and clearance requirements should not be overall large.

【作者单位】：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金资助项目(51108190) 华南理工大学亚热带建筑科学国家重点实验室自主研究课题资助项目(2012ZC27)
【分类号】：U455.4
【正文快照】： 1引言电力隧道施工过程中,频繁遇到盾构机通过竖井的情况,盾构机每过一个工作井就涉及到盾构机进出洞的问题,如果采用先开挖竖井后施工隧道的常规方案,需要采用大量的进出洞辅助措施,且风险大,施工工期也长。因此,近几年电力隧道先隧道施工后工作井开挖工法(先隧后井)法得到了

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