饱和粉细砂地层隧道围岩塌落机理及施工控制研究
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摘要
针对宝峰隧道深埋穿越饱和粉细砂段施工过程中出现洞内流砂、地表陷坑及高速路面下沉现象,采用颗粒离散元分析方法,建立了浅、深埋条件下饱和粉细砂围岩受力分析计算模型,研究了饱和粉细砂地层隧道围岩塌落破坏过程,结果表明无论深浅埋,隧道开挖后都无法形成有效的塌落拱。超前改良加固围岩,增加隧道周边围岩的承载能力,提高围岩黏聚力,是确保该地层围岩稳定的最有效手段。在此基础上,提出了"拱部双层超前旋喷咬合桩+掌子面正面旋喷桩加固+边墙单层超前旋喷咬合桩+加强衬砌结构"饱和粉细砂地层围岩加固及施工控制措施,可为类似工程提供有益参考。
This paper studied the failure process of surrounding rock mass in saturated silty sand tunnel, showing that no matter the deep or shallow burial, the collapsed tunnel can not form an effective arch. Improving the surrounding rock, enhancing the bearing capacity and the cohesion of rock are the most effective way to ensure the stability of surrounding rock. Based on this, the author puts forward the reinforcement and construction control measures for the surrounding rock characterized by saturated fne sand. The "Arch double-layer advanced rotary spray occlusive pile + Side wall singlelayer advanced rotary spray occlusive pile + Reinforcement of positive jet grouting pile on palm face + Strengthening lining structure", can be served as effective reference for similar projects.
This paper studied the failure process of surrounding rock mass in saturated silty sand tunnel, showing that no matter the deep or shallow burial, the collapsed tunnel can not form an effective arch. Improving the surrounding rock, enhancing the bearing capacity and the cohesion of rock are the most effective way to ensure the stability of surrounding rock. Based on this, the author puts forward the reinforcement and construction control measures for the surrounding rock characterized by saturated fne sand. The "Arch double-layer advanced rotary spray occlusive pile + Side wall singlelayer advanced rotary spray occlusive pile + Reinforcement of positive jet grouting pile on palm face + Strengthening lining structure", can be served as effective reference for similar projects.
引文
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[8]袁晔.兰新二线大梁隧道高地应力软岩大变形控制技术研究[D].四川:西南交通大学,2016.
[9]张阳.软弱围岩三台阶带临时仰拱一次开挖施工技术[J].建材与装饰,2017:249.
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[11]许瑞宁.昔格达组地层大断面隧道变形规律及结构受力特征研究[D].四川:西南交通大学,2016.
[2]魏文义,杜立新,毕德灵,孙成刚.水平旋喷在饱和粉细砂围岩中的应用[J].现代隧道技术,2011.
[3]侯军红,曾青.大西客运专线上白隧道穿越粉细砂层超前支护方案探讨[J].铁道标准设计,2012:12-14.
[4]李世才.桃树坪隧道富水未成岩粉细砂试验段施工技术[J].现代隧道技术,2012.
[5]郭振超.穿越富水饱和粉细砂地层双线客专隧道综合施工技术研究[D].陕西:西安建筑科技大学,2013.
[6]韩赟.含水弱胶结性砂岩隧道施工工法研究[D].北京:北京交通大学,2013.
[7]孙乐富,王平.三台阶临时仰拱法在滇中红土泥岩隧道中的应用[J].山西建筑,2015.
[8]袁晔.兰新二线大梁隧道高地应力软岩大变形控制技术研究[D].四川:西南交通大学,2016.
[9]张阳.软弱围岩三台阶带临时仰拱一次开挖施工技术[J].建材与装饰,2017:249.
[10]侯效伟.水平旋喷注浆预加固技术在宝峰隧道饱和粉细砂不良地质中的应用[J].公路交通科技(应用技术版),2016.
[11]许瑞宁.昔格达组地层大断面隧道变形规律及结构受力特征研究[D].四川:西南交通大学,2016.