交错近接新建隧道围岩变形三维模型试验研究

发布时间：2018-01-14 07:37

本文关键词：交错近接新建隧道围岩变形三维模型试验研究　出处：《现代隧道技术》2017年05期 　论文类型：期刊论文

【摘要】：为了分析新建隧道开挖过程中,既有隧道的存在及交错间距变化对新建近接隧道围岩形变量的影响,文章以重庆两江隧道交错近接段为依托工程,开展了交错近接隧道相似模型试验和相应的数值模拟研究。研究表明:交错隧道近接距离与新建隧道的拱顶沉降量及左、右拱腰收敛值成反比;新建隧道开挖过程中的拱顶沉降量及左、右拱腰收敛值的变化趋势一致,可归纳为迅速上升、缓慢上升和稳定三个阶段;隧道拱顶沉降量最大且大于拱腰收敛值之和,对于该类隧道,隧道围岩变形设计上限应以拱顶沉降量为主。通过数据拟合,建立了隧道变形量H(mm)及隧道交错间距L(m)的关系式,相关系数均大于0.995,可为类似隧道预留变形量的设计和施工提供参考。
[Abstract]:In order to analyze the tunnel excavation process, existing tunnel and staggered pitch on new adjacent tunnel surrounding rock deformation, taking Chongqing tunnel near section staggered project, carried out staggered adjacent tunnel similar and corresponding numerical simulation model test. The results show that: the cross tunnel the distance with the new tunnel vault settlement and the left and right arch waist convergence value is inversely proportional to the settlement; and left in the process of tunnel excavation vault, the right arch changes with the convergent value, can be summarized as the rapid rise, slow rise in the three stage and stable; and more than the maximum value of the convergence and arch waist the tunnel vault settlement, the tunnel should be vault settlement deformation of tunnel surrounding rock. The upper design mainly through data fitting, establish the tunnel deformation H (mm) and L (m) tunnel staggered distance formula, the relevant department The number is more than 0.995, which can provide reference for the design and construction of the deformation of the similar tunnel.

【作者单位】：山地城镇建设与新技术教育部重点实验室;重庆大学土木工程学院;
【基金】：国家863计划项目(2007AA11Z110) 国家自然科学基金创新群体基金(50621403);国家自然科学基金重点项目(50334060)
【分类号】：U451.5
【正文快照】： 修改稿返回日期:2015-09-031引言为满足不同地形走势和线路规划等方面的要求,根据隧道位置的不同,近接隧道可以分为四种:左右并列近接隧道、上下重叠近接隧道、空间交叉扭转近接隧道和斜向交错近接隧道[1,2]。左右并列的近接隧道变化较少,形式单一,其相关的研究、设计和施工等

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