Experimental study on the migration regularity of sand outside a large, deep-water, open caisson during sinking
Experimental study on the migration regularity of sand outside a large, deep-water, open caisson during sinking
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DOI：
10.1016/j.oceaneng.2019.106601
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发表时间：
2019-12
影响因子：
5
通讯作者：
Bing-nan Jiang;Wang Mengting;Tao Chen;Zhang Lulu;Jian-lin Ma
中科院分区：
文献类型：
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作者：
Bing-nan Jiang;Wang Mengting;Tao Chen;Zhang Lulu;Jian-lin Ma
本文以世界上最大的沉井下沉施工为背景，设计并进行了下沉模拟试验。对沉降过程中的传感器数据、沉箱外泥沙的运移轨迹和沉后河床的沉降进行了测量和分析。阐述了沉箱外泥沙运移的影响范围与下沉深度的关系，以及运移后形成的沉降空间特征。结合沉箱施工实测资料，得出沉箱外泥沙运移主要与沉箱深度和沉箱外泥沙的空间位置有关，并受渗流力、叶脚反力和侧压力的影响。通过动态对比分析，建立了描述运移行为的计算模型。研究发现，沉箱的渗流力、叶脚反力、侧压力、涌砂和突然下沉都与泥沙运移有关。定义了一个迁移系数来描述迁移速率和不同程度的涌砂和突陷。
Based on the sinking construction of the largest open caisson across the world, a sinking simulation test is designed and conducted in this work. Data from sensors during subsidence, the migration track of the sand outside the caisson and the settlement of the riverbed after the sinking are measured and analysed. The relationships between the influence range of sand migration outside the caisson and the sinking depth, and the characteristics of the subsidence space formed after migration are described. Combined with measured data from caisson construction, the migration of sand outside the caisson is concluded to be mainly related to the depth of the caisson and the spatial position of the sand outside the caisson and to be influenced by the seepage force, the blade foot reaction force and the lateral pressure. A calculation model describing the behaviour of the migration is established through dynamic comparison and analysis. It is found that the seepage force, the blade foot reaction force, the lateral pressure, sand gushing and sudden sinking of the caisson are all related to the sand migration. A migration coefficient is defined to describe the migration rate and different degrees of sand gushing and sudden sinking.