高速铁路隧道岩溶突水发生机理研究

针对高速铁路隧道经过岩溶发育段频频发生突水、突泥的现状,以油坊坪隧道岩溶突水为研究背景,对其突水机理展开了理论及数值计算研究,建立了油坊坪隧道岩溶突水的两类力学模型,对两类模型的力学失稳机理展开了理论推导,将理论推导结果应用于油坊坪隧道岩溶突水现场,理论计算结果与隧道现场突水情况相一致。通过快速拉格朗日Flac3D程序对岩溶突水的机理及相关规律进行了数值分析计算,计算结果表明,隧道未开挖时,隧道的左拱顶沿岩溶管道方向渗流矢量强烈,表明左拱顶附近将是地下水的重要渗流通道;隧道开挖后,岩溶通道彻底打开,岩溶管道渗流朝管道临空面,隧道环向渗流矢量均朝隧道中心;对岩溶管道进行注浆处治并施加衬砌后,孔隙水压力发生明显降低,岩溶通道的一定范围外的左下侧、右侧易沿矢量集中位置形成渗流通道,可以将该范围视为需注浆加固处治区域。

Study on karst water inrush mechanism in high-speed railway tunnel

In view of the high speed railway tunnel through the karst development period of the present situation of the water inrush occurred frequently, this paper takes Youfangping tunnel occurred karst water bursting as the research background. The water inrush mechanism was studied by theory and numerical calculation. Two kinds of mechanical models of karst water bursting in Youfangping tunnel was established. The mechanics instability mechanism of the two kinds of model was a theoretical derivation, the results of theoretical derivation were applied to Youfangping tunnel karst water bursting in the practical field, the theoretical calculation result was consistent with the tunnel site actual water inrush. By fast Lagrangian Flac3D program of karst water bursting mechanism and related laws were analyzed in numerical calculation. Calculation results show that, when tunnel hasn"t been excavated, the left of the tunnel vault along the direction of karst conduit flow vector, suggests that the left vault near will be the important groundwater seepage channel. Karst channel tunnel completely open when tunnel has been excavated, and karst seepage international airport into pipes, pipe tunnel seepage vector loop to toward the tunnel center. The karst conduit grouting treatment and after applying lining, parts area was formed seepage channel, the range could be regarded as grouting reinforcement treatment area.