南寨隧道进口端左洞偏压支护技术应用  

Technology and Application of Biased Pressure Support for the Left Entrance of Nanzhai Tunnel

作　　者：鄂盛中 E Shengzhong(Guangdong Hualu Transport Technology Co.,Ltd.,Guangzhou 510420)

机构地区：[1]广东华路交通科技有限公司,广州510420

出　　处：《广东公路交通》2022年第2期54-59,共6页Guangdong Highway Communications

摘　　要：隧道进口端隧洞受地质条件和施工技术的影响,易出现偏压现象。以南寨隧道为对象,针对隧道进口端左洞偏压问题设计支护策略,并分析其应用性能。构建含水状态下的隧道岩石蠕变模型,鉴别南寨隧道左洞偏压类型并分析偏压特征,采用三台阶七步开挖施工工序制定进口端左洞偏压支护策略。将此次设计的支护策略应用于南寨隧道施工中,监测数据表明隧道进口端左洞竖直位移量下降、围岩应力和钢拱架应力均有大幅度提升。Due to the influence of geological conditions and construction technology, the tunnel entrance is prone to biased phenomenon. Taking Nanzhai Tunnel of Yunmao Expressway in Guangdong Province as the object, the support strategy has been designed for the biased problem of the left entrance of the tunnel, and its application performance has been analyzed. Build a tunnel rock creep model under water-bearing conditions, identify the bias pressure type of the left tunnel of Nanzhai Tunnel and extract the bias pressure characteristics, and use the three-step and seven-step excavation construction process to formulate the bias support strategy for the left entrance, so as to realize the biased pressure treatment of the left tunnel. The support strategy designed this time has been applied to Nanzhai Tunnel, and the vertical displacement of the left entrance of the tunnel has been decreased, and the surrounding rock stress and steel arch stress have been greatly increased.

关 键 词：南寨隧道 进口端左洞 偏压问题 支护策略 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]