基于ALE方法的射流冲刷砂土和黏土的数值计算

发布时间：2018-03-04 22:26

  本文选题：射流冲刷　切入点：砂土　出处：《科学技术与工程》2017年11期 　论文类型：期刊论文

【摘要】：疏浚工程中常采用射流冲刷的方式辅助切削土壤,但面对不同土质时其效果差异较大。针对疏浚中常见的砂土和黏土两种土质,采用ALE(Arbitrary Lagrangian-Eulerian)方法对其射流冲刷过程进行了数值计算,通过实验验证了计算结果的有效性,比较了两种土质在射流冲刷下的坑深发展、冲坑形态和冲刷能耗。结果表明:两种土质的冲刷坑深在初始阶段均线性增长,相同冲刷速度下黏土的发展速度较慢;两种土质的冲刷坑形均具有相似性,冲刷黏土获得的坑形更为陡峭;随着目标坑深的增长,两种土质所需冲刷速度线性增加,获得相同冲坑深度时,黏土(剪切强度17 kPa)所需能耗达砂土的十多倍。
[Abstract]:In dredging engineering, the method of jet scouring is often used to assist soil cutting, but the effect is quite different in the face of different soil quality. In view of the two kinds of soil, sand and clay, which are commonly used in dredging, The ALE(Arbitrary Lagrangian-Eulerian method is used to calculate the jet scour process. The validity of the calculation results is verified by experiments, and the pit depth development of two kinds of soil under jet scouring is compared. The results show that the depth of the scour pit increases linearly at the initial stage, and the clay develops slowly at the same scour velocity, and the scour pit shapes of the two kinds of soil are similar, the results show that the erosion pit depth of the two soils increases linearly at the initial stage, and the clay develops slowly at the same scour velocity. With the increase of the depth of the target pit, the scouring velocity of the two soils increases linearly, and the energy consumption of the clay (shear strength 17 KPA) is more than 10 times that of the sandy soil when the same depth of scouring pit is obtained.
【作者单位】： 河海大学疏浚技术教育部工程研究中心;河海大学机电工程学院;
【基金】：中央高校基本科研业务经费(2013B10314)资助
【分类号】：TV135;TV851
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本文编号：1567589