香炉山3-1号隧道不良地质分析及综合处理

Adverse Geological Analysis and Comprehensive Treatment of No.3-1 Tunnel in Xiang lu shan

香炉山隧洞3-1号支洞具有破碎,节理裂隙发育,多表现为碎裂结构和镶嵌结构,差异分化明显,岩石分类无规律性,有深部的富水,全风化及地下水发育的特点。在特殊的地质条件下施工,加强综合超前地质预报工作是必不可少的工序,特别是掌子面超前地质钻孔作为具体情况信息的反馈,可及时发现特殊不良地质的位置及规模,采取具有针对性的施工方案。对于地下富水地段总体思路和原则是“预防第一、以堵为主、堵排结合、限量排放,统筹兼顾”,提前引排地下水,是防止突水、涌水、突泥的有效措施,为保证开挖洞壁的稳定,对不良地质、节理裂隙发育的应及时注浆加固,防止牵引式塌方及初期支护变形。

No.3-1 branch tunnel of Xianglushan Tunnel has many characteristics,such as developed joints and fissures,obvious differentiation,irregular rock classification,rich water in deep,fully weathered and groundwater development.In construction under special geological conditions,it is necessary to strengthen comprehensive advanced geological prediction.In particular,as feedback of specific information,the palm face advanced geological drilling can timely find the location and scale of special unfavorable geology and adopt specific construction scheme.For the underground water-rich section,the general idea and principle is to prevent water inrush,water inrush and mud inrush in advance,and to ensure the stability of excavation wall,timely grouting and reinforcement should be carried out for the development of unfavorable geology and joint fissures,so as to prevent traction collapse and initial support deformation.