全强风化花岗岩富水地层隧道施工技术
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摘要
小天都隧道洞身段左线340 m、右线290 m范围内为全强风化花岗岩富水地层,开挖变形大。为在富水地层全强风化花岗岩中控制围岩变形,达到快速安全施工,以小天都隧道为研究对象,采用理论和现场监测等手段对全强风化花岗岩富水地层中的施工技术进行探究。研究结果表明,采用三台阶预留核心土环形开挖并施作超前支护能够有效控制围岩变形、减小隧道拱顶下沉;全强风化花岗岩遇水会显著降低自身强度,采用洞内引排水及洞外井点降水措施可有效降低围岩含水率,进而有效降低其遇水崩塌的危险性,保证施工安全与进度。所得结果可为大断面隧道在类似地质条件下的施工提供参考。
Body section at a length of 340 m of left line and 290 m of right line of Xiaotiandu Tunnel is water-rich fully and strongly weathered granite stratum, which has a large deformation of excavation. Taking the above area as the object of study,exploring the construction techniques for water-rich fully and strongly weathered granite section of Xiaotiandu Tunnel,and controlling the deformation of surrounding rock. The results show that: Adopting the annular excavation of three steps reserved core soil together with advance support can control the deformation of surrounding rock effectively and reduce tunnel crown settlement;Water-rich fully and strongly weathered granite can significantly reduce its strength meeting with water, adopting the water diversion and drainage in tunnel and well-points dewatering outside of tunnel can reduce the water content of surrounding rock effectively,and then reduce the risk of water collapse effectively,guaranteeing the safety and schedule of tunnel construction. The obtained results can provide reference for the construction of large cross section tunnel under similar geological conditions.
Body section at a length of 340 m of left line and 290 m of right line of Xiaotiandu Tunnel is water-rich fully and strongly weathered granite stratum, which has a large deformation of excavation. Taking the above area as the object of study,exploring the construction techniques for water-rich fully and strongly weathered granite section of Xiaotiandu Tunnel,and controlling the deformation of surrounding rock. The results show that: Adopting the annular excavation of three steps reserved core soil together with advance support can control the deformation of surrounding rock effectively and reduce tunnel crown settlement;Water-rich fully and strongly weathered granite can significantly reduce its strength meeting with water, adopting the water diversion and drainage in tunnel and well-points dewatering outside of tunnel can reduce the water content of surrounding rock effectively,and then reduce the risk of water collapse effectively,guaranteeing the safety and schedule of tunnel construction. The obtained results can provide reference for the construction of large cross section tunnel under similar geological conditions.
引文
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[14]燕全会.莲花山1号隧道富水全强风化花岗岩地段施工技术探讨[J].公路交通技术,2016,32(1):105-108.
[15]袁敬强,陈卫忠,黄世武,等.全强风化花岗岩隧道突水灾害机制与协同治理技术研究[J].岩石力学与工程学报,2016,35(S2):4164-4171.
[16]张慧峰,吴建文,张恒.已揭露高压地下水隧道注浆参数与工艺[J].筑路机械与施工机械化,2017,34(8):47-52.
[17]鲁军良,宋新杰.全风化千枚岩围岩双连拱隧道变形控制技术[J].筑路机械与施工机械化,2012,29(1):67-71.
[2]蒲会中,蔡芸泽,王卫花.帷幕注浆施工技术在铜锣山隧道中的应用[J].岩土工程技术,2014,28(2):73-75,82.
[3]何振宁.铁路隧道疑难工程地质问题分析——以30多座典型隧道工程为例[J].隧道建设,2016,36(6):636-665.
[4]王晓峰,董辉,于清桦.黄土边坡稳定性影响因素及分析方法[J].岩土工程技术,2013,26(1):37-40.
[5]周平,王志杰,徐海岩,等.考虑含水率的昔格达地层隧道围岩稳定及亚级分级研究[J].土木工程学报,2017,50(12):97-110.
[6]王志杰,周平,徐海岩,等.昔格达地层隧道围岩灾变特征及致灾因子研究[J].铁道工程学报,2017,34(11):67-75.
[7]朱东亚,金之钧,张荣强,等.震旦系灯影组白云岩多级次岩溶储层叠合发育特征及机制[J].地学前缘,2014,21(6):335-345.
[8]张沛杰·留村隧道软岩施工技术[J].筑路机械与施工机械化.2017,34(7):88-91.
[9]张洋,王志杰,周平,等.富水粉细砂层隧道开挖坍塌的加固技术研究及效果分析[J].路基工程,2017(3):151-156.
[10]周平,王志杰,杨跃,等.玄武岩纤维喷射混凝土在热害环境下的性能试验研究[J].土木建筑与环境工程,2016,38(1):69-76.
[11]张顶立.隧道及地下工程的基本问题及其研究进展[J].力学学报,2017,49(1):3-21.
[12]张健儒.山岭隧道软弱围岩工程地质特性及施工对策[J].隧道建设,2014,34(8):749-753.
[13]王梦恕,谭忠盛.中国隧道及地下工程修建技术[J].中国工程科学,2010,12(12):4-10.
[14]燕全会.莲花山1号隧道富水全强风化花岗岩地段施工技术探讨[J].公路交通技术,2016,32(1):105-108.
[15]袁敬强,陈卫忠,黄世武,等.全强风化花岗岩隧道突水灾害机制与协同治理技术研究[J].岩石力学与工程学报,2016,35(S2):4164-4171.
[16]张慧峰,吴建文,张恒.已揭露高压地下水隧道注浆参数与工艺[J].筑路机械与施工机械化,2017,34(8):47-52.
[17]鲁军良,宋新杰.全风化千枚岩围岩双连拱隧道变形控制技术[J].筑路机械与施工机械化,2012,29(1):67-71.