Development and Calibration of an Electronic Miniature Cone Penetrometer for Design of Small Piles in Silty Clays
Development and Calibration of an Electronic Miniature Cone Penetrometer for Design of Small Piles in Silty Clays
复制标题
用于粉质粘土小桩设计的电子微型圆锥贯入仪的开发和校准
DOI：
10.1520/jte103432
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发表时间：
2011-09
期刊：
影响因子：
--
通讯作者：
Cui Xinzhuang
中科院分区：
文献类型：
--
作者：
Cui Xinzhuang
针对水平荷载作用下浅埋小尺寸桩的设计问题，研制了一种新型微型电子贯入仪。此外，还设计了一种新型的小型定标室，用于在实验室内形成均匀的土样用于微型圆锥贯入试验(MCPT)。在粉质粘土中进行了一系列的静力触探试验和桩荷载试验。对于粉质粘土，在试验的19°~32°范围内，贯入曲线与锥角无相关性。对于粉质粘土，贯入曲线的起始段是线性的。然而，当锥体穿透到一定深度时，锥体尖端阻力趋于稳定。结果表明，粉质粘土的MCPT存在临界深度效应。对于粉质粘土，不同围压下的土体破坏机理不同，其临界深度效应也不同。小尺寸桩的水平承载力和桩身刚度都与土体的极限锥端阻力直接相关。结果表明，微型圆锥贯入仪是小尺寸浅埋桩设计的有效工具。
For the design of shallowly embedded small size pile under lateral load, a new kind of electronic miniature cone penetrometer is developed. And a novel mini calibration chamber is also designed to form homogeneous soil specimens for miniature cone penetration test (MCPT) in laboratory. A series of MCPTs and pile loading tests in silty clay are carried out. For silty clay, penetration curve has no correlation with cone angles within the tested range of 19° to 32°. The initial segment of penetration curve is linear for silty clay. However, the cone tip resistance tends to be stable when the cone is penetrated to a certain depth. It is implied that the critical depth effect occurs for MCPT of silty clay. For silty clay, the critical depth effect is caused by different soil failure mechanisms under different confining pressures. The lateral bearing capacity and stiffness of small size pile are all directly related to the ultimate cone tip resistance of soil. It is concluded that the miniature cone penetrometer is an effective apparatus for the design of small size shallowly embedded pile.
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