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中文摘要：
筒型基础是一种常见的海洋基础型式，其成功地沉放就位是正常使用的前提。故针对筒型基础，在均匀粉质黏土中开展了不同长径比的模型静压沉放试验，得到了筒型基础在静压沉放过程中的筒端和筒壁内外压力的变化情况。试验结果表明：筒内压力呈双折线形式，筒外压力线性增加，筒壁的侧向挤压是产生筒内压力的主要原因，简内的挤土效应明显高于筒外；筒外的挤土程度为上部小，下部大，并与土塞增长率IFR成线性关系；筒端阻力与土的强度直接相关。根据规范，基于不排水剪强度和静力触探（CPT）可较准确的计算筒侧阻力和端阻力，由于挤土效应的差异，计算筒内阻力时的口、杆要取较大值。在基础沉放过程中主要阻力由端阻转变为侧阻，静压阻力和土塞的发展对0．1～0．2cm／s之间的下沉速度不敏感，长径比￡／D在1～2间的筒型基础的挤土效应和阻力特性是相近的。
英文摘要：
Successful installation of bucket foundations, a common foundation in ocean engineering, is a prerequisite for normal use. Static pressure sedimentation tests on the bucket foundations with different length-to-diameter ratios are performed in homogeneous silty clay to determine the change of pressure inside and outside the cylinder wall and the cylinder end during the static pressure sedimentation process. The results show that the inner pressure is in the form of double broken line. The outer pressure increases linearly, and the lateral extrusion of the wall is the main reason for the inner pressure generation. The soil squeezing effect in the interior wall is much significant than the exterior wall. The soil squeezing extent of the exterior is small on the upper portion and large on the lower portion of the foundation, which has a linear relationship with the IFR. The tip resistance is directly related to the strength of the soil. According to the standard, based on the undrained shear strength and the CPT, the lateral and tip resistance can be calculated accurately. Due to the difference of soil squeezing effect, a and kf will take larger value when the inner resistance is calculated. The major part of resistance is tip resistance, and then lateral resistance becomes the major during installation. The resistance and the development of soil plug are not sensitive to the speed range of 0.1-0.2 cm/s. The soil squeezing effect and resistance characteristic of bucket foundations with length-to-diameter ratio between 1 and 2 are similar.
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