菏泽学院学报

运用离散元方法构建了岩溶隧洞层状节理掌子面突水数值计算模型，研究了岩溶隧洞在开挖过程中掌子面隔水阻泥岩体突水失稳过程，揭示不同岩溶水压下，隔水阻泥岩体位移、渗流场等灾变信息的演化规律．结果表明：随着岩溶隧洞的开挖推进，隔水阻泥岩体挤出位移由单一卸荷过渡到由卸荷和岩溶水压共同影响；溶腔中的水不断涌入到节理裂隙中，导致水压不断上升，掌子面各测点位移不断增加；当掌子面隔水阻泥岩体突水通道形成和突水失稳瞬间，岩溶水流速急剧上升，呈现出显著的突水前兆信息．研究成果可为岩溶隧洞突水灾害防控提供指导作用．

This article uses the discrete element method to construct a numerical calculation model for water inrush from the layered joint face of Karst tunnels,and studies the instability process of water inrush from the water blocking and mud blocking rock mass on the face during tunnel excavation.It reveals the evolution rules of disaster information such as displacement and seepage field of the water blocking and mud blocking rock mass under different water pressures.The results indicate that as the excavation of Karst tunnels progresses,the displacement of the impermeable mud rock mass is affected by a single unloading,and then by the combined effects of unloading and water pressure;The water inside the dissolution chamber continuously flows into the joint fissures,causing the water pressure to rise continuously and the displacement of each measuring point on the palm surface to increase continuously;At the moment of the formation and instability of the water inrush channel in the mud rock mass across the palm face,the flow velocity of karst water sharply increases,showing significant precursors of water inrush.The research results can provide guidance for the prevention and control of water inrush disasters in Karst tunnels.