| 粉土中筒型基础贯入阻力的研究 |
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| 引用本文： | 马文冠,刘润,练继建,郭绍曾.粉土中筒型基础贯入阻力的研究[J].岩土力学,2019,40(4):1307-1312. |
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| 作者姓名： | 马文冠 刘润 练继建 郭绍曾 |
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| 作者单位： | 天津大学 水利工程仿真与安全国家重点实验室，天津 300072 |
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| 基金项目： | 国家杰出青年科学基金(No. 51825904)；创新方法工作专项(No. 2016IM030100) |
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| 摘 要： | 筒型基础在海洋工程中应用广泛，贯入阻力的准确计算是筒型基础成功应用的关键。在海洋工程中，粉土是介于砂土与黏土间的特殊土，现有计算方法中将粉土等同于砂土，忽略了黏聚力c对贯入阻力的影响。开展了粉土中筒型基础的现场贯入试验，观测了自重下沉阶段与负压贯入阶段筒型基础贯入阻力与贯入深度的关系，提出了粉土中计算沉贯阻力的方法，并对不同筒端形式的减阻效果进行了深入分析。研究结果表明，采用现有规范方法计算粉土中筒型基础的贯入阻力值较实测值偏小20%，提出的两种方法不仅适用于计算粉土中筒型基础的贯入阻力，而且能够反映负压贯入阶段的减阻效果；尖筒端可使筒端阻力减少50%，减阻环可使筒侧摩阻力减少50%，但减阻环会破坏筒壁周围土体，形成渗流通道，导致负压失效。
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| 关 键 词： | 筒型基础 粉土 沉贯阻力 计算方法 减阻环 |
| 收稿时间： | 2017-11-01 |
The study of penetration resistance of bucket foundation in silt |
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| MA Wen-guan,LIU Run,LIAN Ji-jian,GUO Shao-zeng.The study of penetration resistance of bucket foundation in silt[J].Rock and Soil Mechanics,2019,40(4):1307-1312. |
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| Authors: | MA Wen-guan LIU Run LIAN Ji-jian GUO Shao-zeng |
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| Institution: | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China |
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| Abstract: | Bucket foundations are widely used in ocean engineering. The determination of the penetration resistance is a key to the successful application of this type of foundation. In ocean engineering, the properties of silt is largely different from sand and clay. But the existing calculation method of penetration resistance of bucket foundation is generally for sandy soil, which neglects the influence of the cohesion c on the penetration resistance. In this paper, three bucket foundations with different types of tip are penetrated by dead-weight and suction pressure. The relations between penetration resistance and penetration depth are measured in the different penetration stages by dead-weight and by suction. Two methods for calculating the penetration resistance of bucket foundation in silt were derived. The effect of drag reduction in different tips were analyzed. Studies have shown that the calculation value of the penetration resistance of bucket foundation by specification in slit is 20% smaller than measured value. Two methods proposed in this paper that can not only accurately calculate the penetration resistance, but also can reflect the drag reduction effect caused by suction. The sharp-tip can reduce the half of the tip resistance and the anti-drag ring reduce the half friction resistance. However, the anti-drag ring will destroy the soil around the wall and formed a seepage channel, which fail to provide the penetration force. |
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| Keywords: | bucket foundation silt penetration resistance calculation method anti-drag ring |
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