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孤石和基岩凸起地层是盾构法施工的特殊地层,孤石一般岩石强度较高,处在砂层及粘土层中,不能固定,不能产生破碎反力,孤石随着土体的破坏而移动。近年来,随着对孤石和基岩凸起地层盾构隧道施工的认识,形成了许多此类工程施工经验总结。基于此本文结合珠海城际铁路工程实例,从孤石和基岩凸起地层成因及特点出发,研究分析了孤石和基岩凸起勘探施工方法、地面预处理技术、孤石洞内处理技术要点,并总结了处理后的孤石和基岩凸起地层盾构掘进施工要点。
Boulders and bedrock bumps are special formations for shield construction. Boulders generally have higher strength in sand and clay so they can not be fixed and can not generate crushing reaction forces. With the destruction of soil, And move. In recent years, with the understanding of shield tunnel construction of boulder and bedrock raised stratum, many such construction experiences have been formed. Based on the case study of Zhuhai intercity rail project and the causes and characteristics of the boulder and bedrock bump formation, this paper analyzes the construction methods of boulder and bedrock bump exploration, ground pretreatment technology, And summarizes the key points of the shield tunneling of the treated boulder and bedrock.