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全强风化花岗岩富水地层隧道施工技术

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成果类型:
期刊论文
论文标题(英文):
Construction Technology of Fully Weathered Granite Water Rich Stratum in Tunnel
作者:
马嘉霈
作者机构:
西南交通大学茅以升学院
语种:
中文
关键词:
隧道工程;全强风化花岗岩;富水;理论研究;现场监测;降排水
关键词(英文):
tunnel;strongly weathered granite stratum;water-rich;theoretical research;field monitoring;water diversionand drainage
期刊:
岩土工程技术
期刊(英文):
Geotechnical Engineering Technique
年:
2018
期:
3
页码:
140-145
基金类别:
教育部创新团队发展计划资助(IRT0955) 中央高校基本科研业务费专项资金资助(SWJTU11ZT33)
机构署名:
本校为第一机构
院系归属:
茅以升学院(唐臣书院)
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。
摘要(英文):
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 re- served 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, a- dopting 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 tun- nel construction. The obtained results can provide reference for tile construction of large cross section tunnel under similar geo- logical conditions.

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