花岗岩风化地层中盾构施工风险和对策研究

On Construction Risks of a Shield Machine Operated in Weathered Granite Stratum and Its Countermeasures

文章论述了花岗岩风化地层特点,根据地层类型对盾构隧道开挖断面进行了分类,主要分析了五类典型地层,即易结"泥饼"地层、含"孤石"地层、"上软下硬"地层、"硬岩"地层和富水地层中盾构施工的风险,并结合广州地铁三号线工程实践研究分析了应对风险的对策及其效果,对类似地层的盾构施工具有普遍的借鉴意义。

The characteristics of weathered granite stratum are described, and the tunnel seetions are classified based on the stratum types. The construction risks of the shield machine operated in the following five typical strata are analyzed, i.e. stratum inclining to mud cake, stratum with boulders, stratum with soft upper part and hard lower part, hard rock, and stratum with rich water. Based on the construction practice of the Guangzhou Metro line 3, the countermeasures against these risks and effects are studied, which can be taken as a reference for the similar project.