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Soil Reconsolidation Following the Installation of Suction Caissons

机译：安装了沉箱后的土壤固结

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摘要

Experiments are being performed with a prototype suctionrncaisson in tanks of soft clay. This paper contains recent testrnresults and numerical simulations showing the reconsolidationrnbehavior of the soil around the installed caisson. The 100-mmrndiameter caisson prototype was proportionally dimensioned tornrepresent a typical offshore suction caisson. Tests werernconducted in normally consolidated deposits of kaolinite clay,rnwhich were formed to simulate common seafloor conditions.rnLarge tanks of the soil were prepared by consolidating a slurryrnto a final thickness of about 1.1 m, a process that took aboutrneight months. Caissons were then installed using dead weightrnand/or suction. Instrumentation was used to recordrndisplacements, axial forces, and pore water pressures duringrninstallation and extraction of the caisson. Tests with thernprototype caisson, as well as tests with a flat plate insertedrnvertically into the test bed deposit, show an increase in pulloutrncapacity with time (set-up) as the soil reconsolidates followingrninstallation. Data are presented showing the dissipation ofrnexcess pore water pressures on the interior and exterior of thernprototype caisson. The measured pore pressures are alsorncompared to results from a finite element simulation of thernreconsolidation process. These results demonstrate how thernpullout capacity of a suction caisson may be limited if largernloads are applied prior to full soil reconsolidation.
机译：实验是在软黏土储罐中使用吸盘原型进行的。本文包含最新的测试结果和数值模拟，显示已安装沉箱周围土壤的重新固结行为。直径为100毫米的沉箱原型按比例标注尺寸，代表了典型的海上吸水沉箱。在正常固结的高岭石粘土沉积物中进行测试，形成沉积物以模拟常见的海底条件。通过将淤浆固结至最终厚度为约1.1 m，准备了大块土壤，整个过程历时约八个月。然后使用自重和/或吸力安装沉箱。使用仪器记录沉箱的安装和提取过程中的位移，轴向力和孔隙水压力。使用原型沉箱进行的测试以及垂直插入测试床沉积物中的平板进行的测试均显示，随着土壤在安装后重新固结，拔出能力随时间（设置）的增加而增加。给出的数据显示了多余的孔隙水压力在原型沉箱的内部和外部的消散。测得的孔隙压力也要与固结过程的有限元模拟结果进行比较。这些结果表明，如果在土壤完全固结之前施加更大的荷载，沉箱的拉出能力可能会受到限制。

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