静压开口管桩沉桩过程模型试验及数值模拟

摘要
图/表
参考文献(15)
相关文章 (15)

全文: PDF (3618 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要利用侧面透明的模型箱和铝管半模桩模拟开口管桩在砂土中的沉桩过程。利用高分辨率数码摄录设备观察土塞形成的3个阶段，分析土塞形成的力学机制。在模型试验基础上，通过二次开发颗粒流程序PFC2D对沉桩全过程进行离散元数值模拟。结果表明，PFC2D能够模拟开口管桩从开始刺入砂土到形成土塞并最终呈现闭口管桩性态的整个过程；通过定性研究开口管桩在沉桩过程中土塞的形成演化规律、桩土接触面、土颗粒细观组构变化以及砂土颗粒运动规律等，从细观尺度出发探讨开口管桩沉桩过程中砂土的变形机制和土塞的形成机制。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	周健1
	2
	陈小亮1
	2
	周凯敏1
	2
	王冠英3

关键词 ：土力学, 开口管桩, 土塞效应, 模型试验, 数值模拟, 颗粒流, 细观

Abstract：With the outstanding economic performance，open-ended jacked pipe piles have been widely used in engineering construction field，and plugging effects will be developed during the installation of open-end pipe piles，which have significant influence on the characteristics of pile while jacking into soil. The mechanism of soil plug formation and particles movement were analyzed by the meso-scale through physical model tests and numerical simulations. The container that consists of four steel sheets and one toughened glass side and aluminum semi-model pile were used to simulate the installation of open-end jacked pipe pile in sand. During the pile jacking into the sand，the courses of soil plug formation were observed from the transparent glass side and the processes can be divided into three stages，and the mechanisms of soil plug formation at three stages were revealed respectively. Based on the results of model test，the parameters of numerical model were determined by the biaxical test in PFC2D；and with the established numerical model and procedure in PFC2D，the driving process was simulated，which could consider both squeezing effects and plugging effects simultaneously. The behaviours of the numerical model are consistent with the results of physical model test. It indicates that PFC2D is capable of simulating the process for pile jacking into sand. In the research work，the courses of soil plug formation and displacement field of sand particles were analyzed. The particles within 5–7 times of particle diameters away from the ektexine of pipe pile will bring out large displacements and rotations，while beyond the thickness of 10–15 times of diameters，the particles will not be influenced almost. Furthermore，the analysis of porosity and contact numbers indicates that the bearing capacity of soil plug is mainly dependent on the lower part.

Key words： soil mechanics open-ended pipe piles plugging effects model test numerical simulation particle flow meso-scale

引用本文:

周健1，2，陈小亮1，2，周凯敏1，2，王冠英3. 静压开口管桩沉桩过程模型试验及数值模拟[J]. 岩石力学与工程学报, 2010, 29(S2): 3839-3846.
ZHOU Jian1，2，CHEN Xiaoliang1，2，ZHOU Kaimin1，2，WANG Guanying3. MODEL TEST AND NUMERICAL SIMULATION OF DRIVING PROCESS OF OPEN-ENDED JACKED PIPE PILES. , 2010, 29(S2): 3839-3846.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/IS2/3839

[1] STEFANOFF G，BOSHINOV B. Bearing capacity of hollow piles driven by vibration[C]// Proceedings of the 9th International Conference on Soil Mechanics and Foundation Engineering. Tokyo：Japan Society of Soil Mechanics and Foundation Engineering，1977：753–758.

[2] MURFF J D，RAINES R D，RANDOLPH M F. Soil plug behavior of piles in sand[C]// Proceedings of the 22nd Offshore Technology Conference. Texas：[s.n.]，1990：25–31.

[3] RANDOLPH M F，LEONG E C，HOULSBY G T. One-dimensional analysis of soil plugs in pipe piles[J]. Geotechnique，1991，41(4)：587–598.

[4] NICOLA A，RANDOLPH M F. The plugging behaviour of driven and jacked piles in sand[J]. Geotechnique，1997，47(4)：841–856.

[5] PAIK K，SALGADO R，LEE J，et al. Behaviour of open- and closed-ended piles driven into sands[J]. Journal of Geotechnical and Geoenviromental Engineering，2003，129(4)：296–306.

[6] MALHOTRA S P. Effect of wall thickness on plugging of open ended steel pipe piles in sand[C]// Proceedings of Sessions of Geo-Denver 2007 Congress：Contemporary Issues in Deep Foundations(GSP 158). Reston：American Society of Civil Engineers，2007：1–16.

[7] KIKUCHI Y，SATO T，MORIKAWA Y，et al. Visualization of plugging phenomena in vertically loaded open-ended piles[C]// Proceedings of Sessions of GeoCongress 2008—GeoCongress 2008：Characterization，Monitoring，and Modeling of GeoSystems，GSP 179. Reston：American Society of Civil Engineers，2008：118–124.

[8] LEONG E C，RANDOLPH M F. Finite element analyses of soil plug response[J]. International Journal for Numerical and Analytical Methods in Geomechanics，1991，15(2)：121–141.

[9] 郑俊杰，聂重军，鲁燕儿. 基于土塞效应的柱形孔扩张问题解析解[J]. 岩石力学与工程学报，2006，25(增2)：4 004–4 008. (ZHENG Junjie，NIE Chongjun，LU Yan¢er. Analytical solutions of cylindrical cavity expansion problems considering plugging effects[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.2)：4 004–4 008.(in Chinese))

[10] PAIK K，SALGADO R. Effect of pile installation method on pipe pile behavior in sands[J]. Geotechnical Testing Journal，2004，27(1)：78–88.

[11] 胡黎明，濮家骝. 土与结构物接触面物理力学特性试验研究[J]. 岩土工程学报，2001，23(4)：431–435.(HU Liming，PU Jialiu. Experimental study on mechanical characteristics of soil-structure interface[J]. Chinese Jounal of Geotechnical Engineering，2001，23(4)：431–435.(in Chinese))

[12] 李剑强，周健. 开口桩中土芯形成、影响因素及判别方法研究[J]. 岩土力学，2008，29(2)：449–454.(LI Jianqiang，ZHOU Jian. Effects on soil plugging and plugged mode in open-ended pile[J]. Rock and Soil Mechanics，2008，29(2)：449–454.(in Chinese))

[13] 闫澍旺，董伟，刘润，等. 海洋采油平台打桩工程中土塞效应研究[J]. 岩石力学与工程学报，2009，28(4)：703–709.(YAN Shuwang，DONG Wei，LIU Run，et al. Study of influence of soil plug on drving piles of offshore oil drilling platform[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(4)：703–709.(in Chinese))

[14] 池永. 土的工程力学性质的细观研究–应力应变关系剪切带的颗粒流模拟[博士学位论文][D]. 上海：同济大学，2002.(CHI Yong. Mesomechanical research on the engineering mechanical property of soil-simulating stress-strain relation and shear band by PFC[Ph. D. Thesis][D]. Shanghai：Tongji University，2002.(in Chinese))

[15] 史旦达. 单调与循环加载条件下砂土力学性质细观模拟[博士学位论文][D]. 上海：同济大学，2007.(SHI Danda. Micromechanical simulations of sand behavior under monotonic and cyclic loading[Ph. D. Thesis][D]. Shanghai：Tongji University，2007.(in Chinese))