| 被动桩侧土体位移场的透明土模型试验 |
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| 引用本文： | 周东,刘汉龙,仉文岗,丁选明,杨昌友.被动桩侧土体位移场的透明土模型试验[J].岩土力学,2019,40(7):2686-2694. |
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| 作者姓名： | 周东 刘汉龙 仉文岗 丁选明 杨昌友 |
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| 作者单位： | 1. 重庆大学 土木工程学院，重庆 400045；2. 重庆大学 库区环境地质灾害防治国家地方联合工程研究中心，重庆 400045 |
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| 基金项目： | 国家自然科学基金青年项目(No. 51608071)；重庆市博士后研究人员科研项目(No. Xm2017007)；中国博士后科学基金第62批面上资助(No.2017M620414)。 |
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| 摘 要： | 常规室内模型试验中,土体侧向位移作用下桩身变形特性能够获得,而桩周土体内部的位移很难量测。因此,结合透明土材料、粒子图像测速(PIV)技术和光学测量系统,设计了侧向位移作用下被动桩桩周土体变形测量试验系统。通过非插入式测量,得到桩不同埋置深度下桩周土体的位移场。试验结果表明:相同侧向位移模式下,桩埋置深度越大,桩对桩前土体的遮拦效应越明显,中间与两侧土体的相对位移越大。基于模型试验的结果建立了数值模型,参数敏感分析表明土体侧向位移形状对桩前土体位移遮拦效应的影响程度依次为矩形、抛物线形和三角形,且遮拦效果随着桩径的增加而更加明显。
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| 关 键 词： | 被动桩 透明土 模型试验 埋置深度 遮拦效应 |
| 收稿时间： | 2018-04-20 |
Transparent soil model test on the displacement field of soil around single passive pile |
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| ZHOU Dong,LIU Hang-long,ZHANG Wen-gang,DING Xuan-ming,YANG Chang-you.Transparent soil model test on the displacement field of soil around single passive pile[J].Rock and Soil Mechanics,2019,40(7):2686-2694. |
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| Authors: | ZHOU Dong LIU Hang-long ZHANG Wen-gang DING Xuan-ming YANG Chang-you |
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| Institution: | 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. National Joint Engineering Research Centre for Prevention and Control of Environmental Geological Hazards in the TGR Area, Chongqing University, Chongqing 400045, China) |
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| Abstract: | In the traditional model test, the pile deformation subjected to soil movement is measurable, while the soil displacement around the pile is difficult to obtain. Therefore, a model test system was designed based on the transparent soil (mixed by fused quartz and a pore fluid with a matching refractive index), particle image velocimetry (PIV) and optical measurement system. A series of model tests were carried out to measure the soil deformation in a non-intrusive way. By analyzing the images of multiple horizontal and vertical slices, a three-dimensional displacement field was obtained. The results show that transparent soil material is technically feasible for studying the displacement field of soils around passive piles. The results also indicate that the shielding effect, i.e. displacement difference between the back and side of the pile, increases with the embedment depth of the pile at the same lateral displacement. Furthermore, a finite element model was calibrated by experiment results, and parametric studies were conducted on the effects of movement profiles and pile diameter. Numerical results indicate that the influence degrees of the soil lateral displacement profile on the soil shielding are classified into rectangular, paraboloid and triangle, respectively. In addition, this shielding effect is positively proportioned to the pile diameter. |
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| Keywords: | passive pile transparent soil model test embedment depth shielding effect |
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