Variation of suction pressure during caisson installation in sand
Variation of suction pressure during caisson installation in sand
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DOI：
10.1680/geot.2008.58.1.1
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发表时间：
2008-02
期刊：
影响因子：
5.8
通讯作者：
M. N. Tran;M. Randolph
中科院分区：
文献类型：
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作者：
M. N. Tran;M. Randolph
在土工离心机上进行了一系列模型试验，研究了在密实砂土中沉箱安装过程中吸力的变化规律。对不同尺寸和不同超载（或有效重量）的沉箱进行了试验。有限元（FE）模拟也进行了研究和解释的实验结果。对两个现场装置和其他模型试验的数据进行了研究，并与离心模型试验的结果进行了比较。观察到吸入压力随埋置深度相对线性增加，遵循与沿沉箱内壁沿着建立临界水力梯度相关的明显斜率。与通过顶升安装沉箱所需的力相比，吸力安装所需的总驱动力（重量加压差）显著降低。当使用较大的超载时，对于给定的贯入深度，所需的吸入压力降低，但总力增加。
A series of model tests was conducted in a geotechnical centrifuge to investigate the variation of suction pressure during caisson installation in dense sand. The tests were carried out for caissons of different size and surcharge (or effective weight). Finite element (FE) simulations were also conducted to study and explain the experimental results. Data from two field installations and other model tests were investigated, and compared with the results from the centrifuge model tests. The suction pressure was observed to increase relatively linearly with embedment depth, following a distinct slope that is related to establishing a critical hydraulic gradient along the inner caisson wall. The total driving force (weight plus pressure differential) required for suction installation is significantly reduced compared with the force required to install the caisson by jacking. When a larger surcharge was used, the required suction pressure decreased for a given penetration depth, but the total force increased....