DEM STUDY ON THE PENETRATION OF JACKED PILES INTO LAYERED SOFT CLAY
DOI:
https://doi.org/10.14311/CEJ.2020.03.0033Keywords:
DEM; Clay; Pile; Force; DisplacementAbstract
In order to explore the variation law of soil particle displacement and pile force around piles during penetration process, the DEM (Discrete Element Method) model is used to test the penetration of pile foundation in layered soft soil foundation. The variation law of pile penetration force, radial pressure at pile-soil interface, friction resistance at pile side, displacement field and force field between particles during penetration process is analyzed. Research shows: (1) The penetration force increases with the increase of penetration depth and pile diameter. The increase of pile diameter is beneficial to overcome the influence of unfavorable strata. (2) At the same penetration depth, with the continuous penetration of the pile body, the radial pressure gradually decreases, showing a significant degradation phenomenon. The reason for the degradation of lateral friction is essentially the degradation of the radial pressure. (3) The distribution of contact force chain in different soil layers is similar, but the range of action is different. The contact force in silt layer is obviously larger than that in silty clay layer. The compressive stress of the soil at the end of the pile transfers radially with tensile stress. With the increase of pile diameter, the compressive stress and tensile stress in soil layer are gradually increasing, and the influence range of compressive stress and tensile stress is also gradually increasing. (4) The displacement of the soil below the pile tip is triangular, and the soil at the pile tip is squeezed around under the action of the pile tip. The influence range of particle displacement in each soil layer is different, and the influence range of particle displacement in silt layer is obviously smaller than that in silty clay layer.
Downloads
References
YANG Su-chun, ZHANG Ming-yi, WANG Yong-hong, SANG Song-kui, MIAO De-zi. Field test on pile tip resistance of closed-end jacked pipe pile penetrating into layered foundation[J]. Rock and Soil Mechanics, 2018, 39(S2): 91-99.
Liu, Jun-Wei;Zhang, Ming-Yi;Yu, Feng;Bai, Xiao-Yu.Experimental study on interface shear fatigue between soils and PHC pipe piles[J]. Chinese Journal of Geotechnical Engineering. 2013, 35(S2)：1037-1040.
Li, L., Li, J., Sun, D. a., & Zhang, L. Time-dependent bearing capacity of a jacked pile: An analytical approach based on effective stress method. Ocean Engineering, 143, 177-185. doi:10.1016/j.oceaneng.2017.08.010
Aleksandar S. Vesic. Expansion of cavities in infinite soil mass[J]. Journal of Soil Mechanics & Foundations Div. 1972. 98（SM3）: 265-290
Mohsen M. Baligh. Strain Path Method[J]. Journal of Geotechnical Engineering. 1985. 111（9）: 1108-1136
Suchun Yang,Junwei Liu,Ankit Garget al. Analytical Solution for Estimating Bearing Capacity of a Closed Soil Plug: Verification Using An On-Site Static Pile Test[J]. Journal of Marine Science and Engineering. 2020. 8（7）: 490
Suchun Yang,Junwei Liu,Mingyi Zhanget al. ANALYTICAL SOLUTION AND FIELD TEST OF CRITICAL BEARING CAPACITY AND SETTLEMENT OF PILE TIP[J]. CIVIL ENGINEERING JOURNAL-STAVEBNI OBZOR. 2020. 1: 61
Guthlac Wilson. THE CALCULATION OF THE BEARING CAPACITY OF FOOTINGS ON CLAY.[J]. Journal of the Institution of Civil Engineers. 1941. 17（1）: 87-96
Suchun Yang,Junwei Liu,Longfei Xuet al. A New Approach to Explore the Surface Profile of Clay Soil Using White Light Interferometry[J]. Sensors. 2020. 20（11）: 3009
Cundall P A. A computer model for simulating progressive, large-scale movement in blocky rock system[C]. Proceedings of the International Symposium on Rock Mechanics, 1971, 2(8): 129-136.
Cundall P A. Strack O D L .A discrete numerical model for granular assemblies[J]. Geotechnique , 1979, 29(1): 47-65.
Zhang Z , Wang Y H . Three-dimensional DEM simulations of monotonic jacking in sand[J]. Granular Matter, 2015, 17(3):359-376.
Wang J , Zhao B . Discrete-continuum analysis of monotonic pile penetration in crushable sands[J]. Canadian Geotechnical Journal, 2014, 51(10):1095-1110.
Yin, F., Xiao, Y., Liu, H., Zhou, H., & Chu, J. Experimental Investigation on the Movement of Soil and Piles in Transparent Granular Soils. Geotechnical and Geological Engineering, 36(2), 783-791. doi:10.1007/s10706-017-0353-2
Yu-nong, L., & Jing-pei, L. Behavior of the penetration process of model jacked pile in layered soil. Electronic Journal of Geotechnical Engineering, 14 P, 1-10.
Duan, N., Cheng, Y.. A modified method of generating specimens for a 2D DEM centrifuge model [C]. Geo-Chicago, American Society of Civil Engineers, 2016, pp: 610-620.
Zhou Jian, Wang Jiaquan, Zeng Yuan, et al. Particle flow simulation for slope stability analysis [J]. Rock and Soil Mechanics, 2009, 30 (1): 86-90.
Zhou Bo, Wang Huabin, Zhao Wenfeng, et al. Study on the correlation between meso-and macro-mechanical parameters of viscous materials [J]. Rock and Soil Mechanics, 2012, 33 (10): 3171-3178.
Chen Jianfeng, Li Huili, Zhou Jian. Study on correlation between macro and micro parameters of clay [J].Quarterly Journal of Mechanics, 2010, 31(2): 304-309.
Heerema E. P., De Jong A. An advanced wave equation computer program which simulates d ynamic pile plugging through a coupled mass-spring system[M]. Numerical methods in offshore piling. Thomas Telford Publishing, 1980: 37-42.
Bond A J, Jardine R J. Effects of installing displacement piles in a high OCR clay[J]. Géotechnique, 1991, 41(03): 341-363.
Downloads
Published
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
