盾构法施工深埋斜井的围岩应力变形分析

发布时间：2018-01-10 04:15

本文关键词：盾构法施工深埋斜井的围岩应力变形分析　出处：《北京交通大学学报》2016年06期 　论文类型：期刊论文

【摘要】：以采用盾构法施工的神华新街台格庙矿区主斜井为研究对象,对该斜井穿越2种典型地层的施工过程进行数值分析,得到了施工过程中围岩的应力分布及变形规律.研究结果表明:随开挖的推进,围岩中的应力释放区和塑性区的分布及隧道拱顶、拱底的位移变化规律与水平隧道基本相同;开挖影响范围内,围岩的最大主应力与位移等值线均近似平行于斜井轴线,平行程度随距离斜井轴线由近至远而逐渐变弱;斜井埋深越大,表面沉降越小,且沿着斜井开挖方向成非线性分布;围岩力学性质越差,斜井开挖面的空间影响范围越大;开挖面前方影响范围大于后方,本文斜井的开挖面影响范围为其前方3倍洞径,后方4倍洞径,大于水平隧道.
[Abstract]:In Shenhua Taigemiao mine main shaft constructed by shield method as the research object, numerical analysis of construction process of the slope through 2 typical strata, the surrounding rock in the construction process of the distribution of stress and deformation. The results show that with the advance of the excavation, the surrounding rock stress release area and the distribution of plastic zone and tunnel vault, displacement variation and the level of the end of the tunnel arch is basically the same; the influence of excavation range, the maximum principal stress and surrounding rock displacement contours are approximately parallel to the shaft axis parallel degree inclined axis with the distance from near to far and gradually become weak; inclined depth greater the surface settlement is small, and along the direction of the nonlinear distribution of inclined shaft excavation; mechanical properties of surrounding rock is poor slope excavation face space greater sphere of influence; in front of the excavation face influence range is greater than the rear, the scope of this slope excavation face effect It is 3 times the diameter of the hole in front and 4 times the hole in the rear, which is larger than the horizontal tunnel.

【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家科技支撑计划资助项目(2013BAB10B06)
【分类号】：U455.43
【正文快照】： 目前,随着煤矿开采深度的加深,煤矿斜井的长度与埋深增大,采用传统的矿山法施工难度大、时间长,而借助盾构施工斜井具有相当优势.近10多年来,尽管采用盾构法施工坡度隧道成功案例已有很多[1],但在已竣工的隧道中,隧道坡度分布在2°~40°,长度基本在2km以内,埋深多小于100 m,且

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