| 粉土中桶基负压沉贯安全机制分析 |
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| 引用本文： | 齐剑峰,雷霆,李源,李安龙.粉土中桶基负压沉贯安全机制分析[J].重庆交通大学学报(自然科学版),2011,30(4):798-802. |
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| 作者姓名： | 齐剑峰 雷霆 李源 李安龙 |
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| 作者单位： | 1. 河北省水资源可持续利用与开放重点实验室,河北石家庄,050031
2. 中国海洋大学海洋地球科学学院,山东青岛,266100 |
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| 基金项目： | 国家自然科学基金项目(50579006,50639010);国土资源公益行业科研资助项目(201011003-11);973专项基金项目(2010CB428805-1) |
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| 摘 要： | 通过模型试验与有限元数值计算,分析了桶基负压沉贯过程中粉土土体的渗流梯度与土塞发展.研究表明:桶基内外的渗流作用是土塞形成的直接原因,渗流作用不仅改变土体的渗透性,而且改变土体的物理力学性质,使土体的流变性质、时间效应增强,桶内粉土存在较大的渗流梯度和阻止发生流土破坏的安全机制；土塞破坏既不是渗透变形,也不是单一的卸衙...
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| 关 键 词： | 桶形基础 粉土 土塞 渗流梯度 安全机制 |
Safety Mechanism Analysis of Bucket Foundation Penetration in Silts |
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| QI Jian-feng,LEI Ting,LI Yuan,LI An-long.Safety Mechanism Analysis of Bucket Foundation Penetration in Silts[J].Journal of Chongqing Jiaotong University,2011,30(4):798-802. |
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| Authors: | QI Jian-feng LEI Ting LI Yuan LI An-long |
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| Institution: | 1.Hebei Province Open Laboratory of Sustained Development and Utilization of Water Resources,Shijiazhuang 050031, Hebei,China;2.College of Marine Geosciences,Ocean University of China,Qingdao 266100,Shandong,China) |
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| Abstract: | Based on the model tests and FEM,a comprehensive analysis of the hydraulic gradient and soil slug in the process of suction penetration of bucket foundation in the silts was carried out to deeply study the suction penetration mechanism.The results indicate that the seepages inside and outside of the bucket foundation are the direct reasons for the formation of soil slugs.The seepage changes not only the permeability of the soil body but also the physical and mechanical properties,and enhances the rheological property and time effect,and there are high hydraulic gradient and the safety mechanism preventing soil flow failure for the silts in the bucket foundation.Thus,the soil slug failure is not seepage failure,or unloading expansion yet,but is a complex deformation failure mode under the protection of safety mechanism of bucket foundation. |
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| Keywords: | bucket foundation silt soil slug seepage hydraulic gradient safety mechanism |
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