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浅埋偏压连拱隧道施工优化及支护结构安全性分析 被引量:4

Analysis of construction optimization and supporting structure safety of shallow multi-arch tunnel under unsymmetrical pressure
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摘要 两江连拱隧道所穿区域地形偏压严重,且岩体破碎,连拱隧道施工开挖对围岩扰动大,不同的施工方案及施工工序隧道支挡结构受力影响较大,本文结合穿越严重偏压地层的两江连拱隧道为例,基于数值分析方法,对在不同施工工序方案下隧道结构内力、变形及偏压支挡结构力学特征进行分析。研究认为:对于复杂地质条件下浅埋偏压连拱隧道,先开挖浅埋侧隧道后开挖深埋侧隧道的施工顺序,比先开挖深埋埋侧隧道后开挖浅埋侧隧道的施工顺序更有利,先开挖浅埋埋侧右洞时,隧道初期支护结构内力、变形及偏压支挡结构桩的内力均比先开挖深埋侧左洞时小,但不管是采用哪种开挖顺序,深埋侧隧道拱顶位移均大于浅埋侧隧道,内排桩的所受弯矩也均大于外排桩。 The Liang-Jiang tunnel area is very serious unsymtrical,and the rock is broken,and the rock will be disturbance during the arch-tunnel excavating,the effection of internal force is larger by different construction plan and order,based on the Liang-Jiang tunnel which is located in the serious unsymtrical area, analysed on the tunnel support internal force and deformation, research on the structure mechanical characteristics of piles of different excavation plan by numerical analysis method. The results shows that:the scheme of excavated shallow-buried tunnel first is better than the scheme of excavated deep-buried tunnel first. If using the scheme of excavated shallow-buried tunnel first, the initial support stress and deformation and the piles inner force is smaller, however, whether the excavation sequence,the vault settlement of deep-buried tunnel is bigger than the shaUow-buried tunnel, and also the internal force of inner row piles is bigger than the outer row piles.
出处 《四川建筑科学研究》 2013年第5期338-342,共5页 Sichuan Building Science
关键词 连拱隧道 浅埋偏压 施工顺序 数值模拟 multi-arch tunnel shallow and unsymmetrical pressure excavation construction order numerical simulation
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