基于数字图像技术的静压桩周土体位移规律分析

doi:10.12066/j.issn.1007-2861.2227

上海大学学报(自然科学版) ›› 2021, Vol. 27 ›› Issue (6): 1118-1127.doi: 10.12066/j.issn.1007-2861.2227

基于数字图像技术的静压桩周土体位移规律分析

姜赟¹, 陆烨¹(), 王校勇²

1.上海大学土木工程系, 上海 200444
2.上海勘察设计研究院(集团)有限公司, 上海 200093

收稿日期:2019-10-15 出版日期:2021-12-31 发布日期:2022-01-06
通讯作者: 陆烨 E-mail:ye.lu@shu.edu.cn
作者简介:陆烨(1979—), 女, 副教授, 博士, 研究方向为砂土室内试验及离散元模拟. E-mail: ye.lu@shu.edu.cn
基金资助:
上海市自然科学基金资助项目(16ZR1411900)

Application of DIC technology in soil displacement analyses around model piles

JIANG Yun¹, LU Ye¹(), WANG Xiaoyong²

1. Department of Civil Engineering, Shanghai University, Shanghai 200444, China
2. SGIDI Engineering Consulting (Group) Co., Ltd., Shanghai 200093, China

Received:2019-10-15 Online:2021-12-31 Published:2022-01-06
Contact: LU Ye E-mail:ye.lu@shu.edu.cn

摘要/Abstract

摘要：

为了研究沉桩对周围土体的挤压效应, 采用半模型桩试验结合数字图像相关(digital image correlation, DIC)技术获取土体位移场, 并用微型压力单元测量水平土体应力. 首先, 对不同位置土颗粒在压桩过程中的累计位移进行全过程分析; 然后, 在压桩停止之后对桩周土体的最终位移情况进行了记录和分析; 最后, 通过设置局部摄像头, 在桩土界面上观察剪切扰动区的厚度. 结果表明: 在桩体移动过程中土体各点的累计位移随着沉桩深度的增加逐渐达到稳定状态, 距离桩体较近测点的位移稳定值总比较远的大; 土体水平位移最大值约在 $16R$ ($R$ 为沉桩半径)深度处, 竖向位移最终方向因深度的不同而有所变化. 对比侧向土应力的发展与水平位移、垂直位移发现, 二者在压桩过程中变化规律的关联性较为密切, 实现了力与位移的统一. 研究成果对进一步揭示沉桩挤土效应内在机理和桩-土间作用机理提供参考.

Abstract:

To study the extrusion effect of the press-in method on surrounding soil, the soil displacement field was determined using the semi-model pile test combined with digital image correlation (DIC) technology and horizontal soil stress was measured by mini pressure cells. Firstly, the cumulative displacement of soil was analyzed at different distances from the pile and the changing law of soil stress was recorded during the pile press-in process. Secondly, the final soil displacement was recorded and analyzed when piling was completed. Finally, the disturbance layer was recorded at the pile-soil interface using a local camera, and the thickness of the disturbance layer was measured. Cumulative displacement gradually reached a stable state, and the measure of displacement decreased with distance from the pile. The maximum value of horizontal soil displacement was at a depth of $16R$ ($R$ is the pile radius). The direction of vertical displacement varied with depth. The development of lateral soil stress was considered including the effects of horizontal and vertical displacement. A strong positive relationship was found between lateral soil stress and vertical as well as horizontal soil displacement during the pile press-in process. The results support the development of a squeezing effect caused by the pile press-in process and the mechanism between the pile and the soil.

Key words: digital image correlation technology, pile press-in, soil displacement field, pile-soil interface, disturbance layer

中图分类号:

TU411.93

姜赟, 陆烨, 王校勇. 基于数字图像技术的静压桩周土体位移规律分析[J]. 上海大学学报(自然科学版), 2021, 27(6): 1118-1127.

JIANG Yun, LU Ye, WANG Xiaoyong. Application of DIC technology in soil displacement analyses around model piles[J]. Journal of Shanghai University（Natural Science Edition）, 2021, 27(6): 1118-1127.

图/表 10

图1

表1

图2

图3

图4

图5

图6

图7

图8

图9

参考文献 20

[1]	张明义. 静力压入桩的研究与应用 [M]. 北京: 中国建材工业出版社, 2004.
[2]	高广运, 周群立, 陈龙珠. 软土中静压桩挤土分析和防治措施[J]. 岩土力学, 2002, 23(增刊 1): 65-68.
	Gao G Y, Zhou Q L, Chen L Z. Analysis of compacting effect and control for silent piling in soft soil[J]. Rock and Soil Mechanics, 2002, 23(Suppl. 1): 65-68.
[3]	罗战友, 夏建中, 龚晓南, 等. 压桩过程中静压桩挤土位移的动态模拟和实测对比研究[J]. 岩石力学与工程学报, 2008, 27(8): 1709-1714.
	Luo Z Y, Xia J Z, Gong X N, et al. Comparative study of dynamic simulation for compacting displacement of jacked pile and in-situ test[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(8): 1709-1714.
[4]	Lehane B, Gill D. Displacement fields induced by penetrometer installation in an artificial soil[J]. International Journal of Physical Modelling in Geotechnics, 2004, 4(1): 25-36. doi: 10.1680/ijpmg.2004.040103
[5]	Jardine R J, Zhu B T, Foray P, et al. Measurement of stresses around closed-ended displacement piles in sand[J]. Géotechnique, 2013, 63(1): 1-17. doi: 10.1680/geot.9.P.137
[6]	White D J, Take W A, Bolton M D. Soil deformation using particle image velocimetry (PIV) and photogrammetry[J]. Geotechnique, 2003, 53(7): 619-631. doi: 10.1680/geot.2003.53.7.619
[7]	刘明亮, 朱珍德, 刘金元, 等. 基于 PIV 技术的锚板抗拉破坏模式识别[J]. 河海大学学报(自然科学版), 2011, 39(1): 84-88.
	Liu M L, Zhu Z D, Liu J Y, et al. Identification of failure modes for uplift anchor plates based on PIV technology[J]. Journal of Hohai University(Natural Sciences), 2011, 39(1): 84-88.
[8]	孔纲强, 曹兆虎, 周航, 等. 水平荷载下扩底楔形桩承载力特性透明土模型试验[J]. 土木工程学报, 2015, 48(5): 83-89.
	Kong G Q, Cao Z H, Zhou H, et al. Experimental study on lateral bearing capacity of enlarged wedge-shaped pile using transparent soil[J]. China Civil Engineering Journal, 2015, 48(5): 83-89.
[9]	曹兆虎, 孔纲强, 刘汉龙, 等. 基于 PIV 技术的沉桩过程土体位移场模型试验研究[J]. 工程力学, 2014, 31(8): 168-174.
	Cao Z H, Kong G Q, Liu H L, et al. Model test on deformation characteristic of pile driving in sand using PIV technique[J]. Engineering Mechanics, 2014, 31(8): 168-174.
[10]	徐建平, 周健, 许朝阳, 等. 沉桩挤土效应的模型试验研究[J]. 岩土力学, 2000, 21(3): 235-238.
	Xu J P, Zhou J, Xu Z Y, et al. Model test research on pile driving effect of squeezing against soil[J]. Rock and Soil Mechanics, 2000, 21(3): 235-238.
[11]	周健, 邓益兵, 叶建忠, 等. 砂土中静压桩沉桩过程试验研究与颗粒流模拟[J]. 岩土工程学报, 2009, 31(4): 501-507.
	Zhou J, Deng Y B, Ye J Z, et al. Experimental and numerical analysis of jacked piles during installation in sand[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(4): 501-507.
[12]	Zhu B T, Jardine R J, Tsuha C H C, et al. Sand grain crushing and interface shearing during displacement pile installation in sand[J]. Géotechnique, 2010, 60(6): 469-482. doi: 10.1680/geot.2010.60.6.469
[13]	Dejong, J T, White, D J, Randolph, M F. Microscale observation and modelling of soil-structure interface behaviour using particle image velocimetry[J]. Soils and Foundations, 2013, 46(1): 15-28. doi: 10.3208/sandf.46.15
[14]	张嘎, 张建民, 梁东方. 土与结构接触面试验中的土颗粒细观运动测量[J]. 岩土工程学报, 2005, 27(8): 903-907.
	Zhang G, Zhang J M, Liang D F. Measurement of soil particle movement in soil-structure interface test[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(8): 903-907.
[15]	Mayne P W, Christopher B R, Dejong J. Manual on subsurface investigations [R]. Washington: National Highway Institute, 2001.
[16]	Chu T C, Ranson W F, Sutton M A, et al. Application of digital-image-correlation techniques to experimental mechanics[J]. Experimental Mechanics, 1985, 25(3): 232-244 doi: 10.1007/BF02325092
[17]	Yates J R, Zanganeh M, Tai Y H. Quantifying crack tip displacement fields with DIC[J]. Engineering Fracture Mechanics, 2010, 77(11): 2063-2076. doi: 10.1016/j.engfracmech.2010.03.025
[18]	Rechenmacher A L. Grain-scale processes governing shear band initiation and evoluation in sands[J]. Journal of the Mechanics and Physics of Solids, 2005, 54(1): 22-45. doi: 10.1016/j.jmps.2005.08.009
[19]	袁炳祥. 发展三维粒子图像测速技术在桩-土相互作用研究中应用[D]. 兰州: 兰州大学, 2012.
	Yuan B X. Development of stereo particle image velocimetry for investigation pile-soil interaction[D]. Lanzhou: Lanzhou University, 2012.
[20]	陆烨, 王校勇, 孙汉清, 等. 室内静压沉桩试验桩周土体全过程位移场分析[J]. 同济大学学报(自然科学版), 2017, 46(10): 1366-1373.
	Lu Y, Wang X Y, Sun H Q, et al. Analysis on soil displacement field caused by pressin process of pile model tests[J]. Journal of Tongji University (Natural Science), 2017, 46(10): 1366-1373.

基于数字图像技术的静压桩周土体位移规律分析

Application of DIC technology in soil displacement analyses around model piles

RichHTML

PDF

可视化

摘要/Abstract

引用本文

使用本文

图/表 10

参考文献 20

相关文章 2

编辑推荐

Metrics

本文评价

[1]	秦世伟, 莫泷, 周艳坤. 静压桩沉桩及已打入桩遮拦效应的数值模拟[J]. 上海大学学报(自然科学版), 2014, 20(2): 239-249.
[2]	秦世伟, 周艳坤, 莫泷. 静压桩沉桩施工对临近隧道的影响[J]. 上海大学学报(自然科学版), 2013, 19(5): 527-533.