Formation mechanisms of water inrush and mud burst in a migmatite tunnel：a case study in China

This paper presents a case study of water inrush and mud burst occurring in a migmatite tunnel to study its formation mechanisms. The geological investigation and mineralogical analysis showed that water inrush and mud burst in the migmatite was closely related to the component of the host rock. High content of soluble minerals,e.g.,calcite and dolomite,would make the migmatite rock prone to be fragmentized,isintegrated and eventually form different sorts of connected or semi-connected veins. The field exploration revealed most cavities in the magmatite tunnel were eroded by groundwater and formed large interconnected networks. The two faults and the dike in the magmatite tunnel became the preferred paths and provided great convenience for plenty of precipitation and mud slurry. Due to high water pressure and blast disturbance,the cavities can soon connect each other as well as all sorts of veins,forming a complex ground channel for water inrush and mud burst. To estimate the potential occurrenceof water inrush and mud burst,the water bursting coefficient was employed. The results showed the water bursting coefficient of the magmatite tunnel was much bigger than the threshold values and it can be used to explain the accident of water inrush and mud burst occurring in the magmatite tunnel.

海底隧道突水涌泥机理及对策研究

海底隧道在穿越断层及软弱破碎带时如果遇到透水性地层,可能会发生隧道突水涌泥,如何妥善处理这些潜在危害对于顺利建成海底隧道至关重要。结合建设中的厦门海底隧道工程,针对隧道通过不良地质时可能遇到的突水涌泥危害,对突水的补给水源、突水通道及隧道与含水层位置关系进行了分析,同时引用В.斯列萨列夫简支梁及强度理论,对海底隧道突水条件及预测方法进行了理论分析。在参考国内外经验的基础上,给出了海底隧道突水涌泥的治理对策,为海底隧道的顺利修建提供了指导。

岩溶隧道突水涌泥致灾机理研究

为防治岩溶隧道突水涌泥给隧道施工造成灾难性后果,以广佛肇高速公路罗仔山隧道为例,研究管道型岩溶隧道突水涌泥致灾机理及预测计算。通过分析发生突水涌泥的灾害特征和机理,建立相关力学模型,以研究隧道突水涌泥的极限状态。研究得出:1)隧洞发生突水涌泥时围岩最小防突厚度的界限条件;2)充填体在充填介质渗透、滑移失稳时的稳定系数K,以此来判断该处是否发生突水涌泥的情况。