【摘要】 基于任意拉格朗日-欧拉方法对射流破土过程进行仿真分析。以琼州海峡黏土质砂为研究对象，选用MAT-FHWA-SOIL模型建立土体材料本构。运用LS＿DYNA软件建立包括射流源、喷嘴、水域及土体的仿真模型，探究射流破土机理。并讨论射流关键参数对破土效果的影响，对射流压力、喷嘴直径、射流靶距进行单因素研究。研究发现在其他射流参数不变的情况下，射流压力增大1倍，最大冲坑深度也增大1倍；土体的冲蚀体积会随着射流压力的增大而增加，与射流时间近似呈线性关系；喷嘴直径从5 cm增大到9 cm时，最大冲坑深度增幅为43%。在20～60 cm之间的射流靶距对清理效果的影响较小。该研究可为海底电缆抢修的射流破土作业过程提供依据。更多还原

【Abstract】 Here, based on the arbitrary Lagrange-Euler method, the process of jet soil-breaking was simulated and analyzed. Taking Qiongzhou Strait clay sand as the study object, MAT-FHWA-SOIL model was selected to establish the constitutive model of soil material. The simulation model including jet source, nozzle, water area and soil body was established using LS＿DYNA software to explore the mechanism of jet soil-breaking, and discuss influences of jet key parameters on the soil-breaking effect. Single factor studies on jet pressure, nozzle diameter and jet target distance, respectively were performed. The study showed that when other jet parameters remain unchanged, jet pressure increases by one time and the maximum depth of scouring pit also increases by one time; erosion volume of soil body can increase with increase in jet pressure, and be approximately linearly related to jet time; when nozzle diameter increases from 5cm to 9cm, the maximum depth of scouring pit increases by 43%; jet target distance of 20～60cm has a smaller impact on the cleaning effect; the study results can provide a basis for jet soil-breaking operation process of submarine cable emergency repair.更多还原