细长桩屈曲的透明土物理模型试验研究

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摘要采用一种在无围压条件下的1-g小规模透明土物理模拟试验，观测了不同约束形式下完全嵌入模型细长桩的完整屈曲曲线。同时，结合粒子图像测速(PIV)和近景摄影测量技术，非介入地测量了细长桩屈曲引起的土体变形。透明土由熔融石英及折射率相匹配的孔隙溶液组成。采用激光面照射透明土模型并拍摄下细长桩屈曲引起变形的数字图像，利用PIV获得所产生的位移场。试验结果分析表明：相对屈曲长度随着桩体强度增加及细长比减小而增加；桩端约束形式对屈曲曲线的影响取决于桩身强度和细长比的变化；土体单元的运动规律与经典朗肯土压力理论相一致。

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关键词 ：物理模拟, 细长桩, 屈曲, 透明土, 粒子图像测速(PIV)

Abstract：A small-scale 1-g physical modeling under unconfined condition，using transparent soil，was employed to observe the complete curves of buckling of fully embedded slender piles with different constraint types. Meanwhile，the soil deformations caused by buckling of slender pile were measured non-intrusively by combining particle image velocimetry(PIV) and close-range photogrammetry. The transparent soil was made of fused quartz and correspondingly refractive index matched blended oil. Transparent soil model was sliced using a laser light sheet，and digital images of soil deformations，caused by buckling of slender pile，were recorded. PIV was utilized to obtain the generated displacement fields. Analysis of test results shows that the relative buckling length increases with the increasing of pile strength and decreasing of slenderness ratio；the effect of end constraint types of pile on buckling curves is dependent on the variations of pile strength and slenderness ratio；the movements of soil elements agree well with the classic Rankine?s earth pressure theory.

Key words： physical modeling slender pile buckling transparent soil particle image velocimetry(PIV)

引用本文:

齐昌广1，陈永辉2，王新泉3，左殿军4. 细长桩屈曲的透明土物理模型试验研究[J]. 岩石力学与工程学报, 2015, 34(04): 828-838.
QI Changguang1，CHEN Yonghui2，WANG Xinquan3，ZUO Dianjun4. PHYSICAL MODELING STUDY ON BUCKLING OF SLENDER PILE USING TRANSPARENT SOIL. , 2015, 34(04): 828-838.

链接本文:

http://www.rockmech.org/CN/Y2015/V34/I04/828

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