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砂土中吸力式三筒基础水平承载特性试验研究
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Experimental Study on Horizontal Bearing Characteristics of Tripod-bucket Foundation in Sand
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    摘要:

    通过一系列小比尺模型试验对吸力式三筒基础水平荷载作用下的承载特性进行了研究,分析了长径比、荷载作用方向和筒间距对吸力式三筒基础承载力影响,试验包括3个长径比、3个荷载作用方向以及3个不同筒间距.试验结果表明:不同工况条件下得到的吸力式三筒基础荷载-位移曲线特性有所不同.相同筒重、不同筒间距下,增大筒的长径比有利于提高水平承载力,但在基础失稳前,沉箱基础模型水平位移随长径比的增加而增大.荷载作用方向对吸力式三筒基础联合工作区域影响显著,荷载最有利方向为0°,此时对应的联合工作效应区域最大;最不利方向为60°,此时筒-土间的联合工作效应最弱.相同尺寸和荷载方向条件下,随着筒间距的增加,承载力有不同程度的上升,长径比越大,承载力增加幅度越明显.

    Abstract:

    Based on a series of small-scale model tests,the bearing characteristics of suction tripod-bucket foundation under horizontal loads are studied,and the effects of the length diameter ratio,load direction and spacing of suction caisson are investigated. The test parameters include three different aspect ratios (length/diameter),three load directions and three caisson spacing conditions. According to the test results,the characteristics of the load-displacement curve for the tripod-bucket foundation under various working conditions are different. Under the same caisson weight and different spacing conditions,increasing the aspect ratio is beneficial to improve the horizontal bearing capacity. However,before the foundation loses stability,the caisson with a larger aspect ratio results in greater horizontal displacement. The change of load direction has a significant influence on the joint working area of the suction tripod-bucket foundation. When the load direction is 0 degree,the corresponding joint working effect area is the largest,which provides the most benefit to the horizontal bearing capacity of the foundation. On the other hand,when the load direction is 60 degrees,the joint working effect between the caisson and soil is the weakest,resulting in the smallest horizontal bearing capacity. Under the same size and load direction conditions,with the increase of caisson spacing,the bearing capacity increases in different degrees. And the larger the ratio of length to diameter is,the more obvious the increase of bearing capacity is.

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赵学亮?覮,李扬扬,王鑫,朱文波,戴国亮,邓温妮.砂土中吸力式三筒基础水平承载特性试验研究[J].湖南大学学报:自然科学版,2021,(9):20~29

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  • 在线发布日期: 2021-09-28
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