【摘要】 针对杭州湾海底管道的实际工程状况,使用声学探测技术对海底管道冲刷自埋演化过程进行了现场检测,验证了海底管道从初始敷设状态依次发展为孔道冲刷、部分掩埋、尾流冲刷、尾流冲刷平衡、再次孔道冲刷和回淤自埋状态的演化过程。采用数值模拟方法分析了海底管道自埋演化过程中的典型状态,结果表明:管道下方的渗流和天然微孔隙是孔道冲刷起动的原因之一;管道下沉过程中流态的改变是导致回淤自埋的主要原因。结合现场检测和数值模拟结果揭示了管道冲刷自埋演化机制,补充和完善了海底管道冲刷自埋演化规律。更多还原

【Abstract】 An acoustic detection technique was used to inspect the process of scouring and self-burying of the submarine pipeline in Hangzhouwan Bay.It is verified that the self-burial process includes pipeline-touch-down,tunnel erosion,partial burial,wake scouring,wake erosion equilibrium,second tunnel erosion and backfilling till self-buried state.The typical states in the process were analyzed with numerical modeling method.The results show that the seepage flow and piping underneath the pipe is one of the driving forces for the tunnel erosion and the change of flow regime during the sagging process of the pipe is the main cause for backfilling and self-burying.Thus,the scouring and self-burying rules and mechanism of the submarine pipeline is verified and complemented by numerical modeling and inspection results.更多还原