软弱围岩隧道管棚水平旋喷组合预加固变形规律

发布时间：2018-05-22 10:59

本文选题：软弱围岩 + 隧道　；参考：《隧道建设》2015年05期

【摘要】：为研究软弱围岩地层管棚水平旋喷桩组合结构的预加固效果,采用三维弹塑性有限元方法对比分析了单独使用管棚、单独使用旋喷桩、管棚与旋喷桩组合预加固及无加固4种工况下隧道结构体系的位移变化规律。结果表明:1)水平旋喷桩和管棚2种工法中,水平旋喷桩预加固工法控制拱顶下沉、拱脚收敛值和掌子面稳定性能力显著;2)管棚预加固工法控制地表沉降的能力较强;3)管棚和旋喷桩组合结构控制拱顶沉降和拱脚收敛,掌子面水平位移性能突出,管棚水平旋喷桩组合结构使地表沉降减小91.3%,拱顶沉降减小76.2%,拱脚收敛减小76.3%,其地表最大沉降值为2.7 mm,拱顶最大沉降值为25 mm,拱脚最大收敛值为4mm,最小收敛值为-9.4 mm,加固效果明显。
[Abstract]:In order to study the pre-reinforcement effect of horizontal rotary jet grouting pile composite structure in soft surrounding rock stratum, the three-dimensional elastic-plastic finite element method is used to compare and analyze the pipe shed alone and the rotary jet pile alone. The displacement variation of tunnel structure system under the combined pre-reinforcement and non-reinforcement conditions of pipe shed and rotary jet pile. The results show that in the two methods of horizontal rotary jet grouting pile and pipe shed, the horizontal rotary jet pile pre-reinforcement method controls the dome sinking. The convergence value of arch foot and the stability ability of palm face are significant (2) the ability to control ground subsidence by pre-reinforcement method of pipe shed is stronger than that by pipe shed and rotary jet pile composite structure to control the settlement and convergence of arch foot, and the horizontal displacement performance of palm surface is outstanding. The composite structure of horizontal rotary jet grouting pile of pipe shed reduces the surface settlement by 91.3, the dome settlement by 76.2and the arch foot convergence by 76.3mm. The maximum surface settlement is 2.7 mm, the maximum settlement of arch is 25 mm, the maximum convergence value of arch foot is 4 mm, and the minimum convergence value is -9.4 mm. Mm, the reinforcement effect is obvious.
【作者单位】：长安大学公路学院;西安建筑科技大学理学院;陕西省铁路投资集团有限公司;
【基金】：陕西省工业科技攻关项目(2015GY185) 交通运输部西部交通建设科技项目(200731800018)
【分类号】：U455.49

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