Research on the Slurry Diffusion and Load-Bearing Characteristics of Postgrouted Piles in Loess Areas
Publication: International Journal of Geomechanics
Volume 24, Issue 9
Abstract
Collapsibility significantly impacts the bearing capacity of pile foundations in loess areas. To improve the load-bearing capacity of piles, the pile-base postgrouting technique is widely used worldwide. However, there are still several related issues to be solved: the impact of loess collapsibility on the bearing capacity; the effectiveness of the pile-base postgrouting technique in enhancing the bearing capacity; and the diffusion pattern of the grout during the grouting process. To investigate these issues, this experiment utilizes a visual static pressure device combined with numerical simulation. According to the experiment, the maximum axial force and neutral point appeared to shift downward after grouting, resulting in a 17.5% increase in the bearing capacity of the pile foundation. Additionally, an increase in grouting pressure leads to a rise in both the number of shear cracks and the diffusion radius. As the permeability of the grout improves, the number of shear cracks and diffusion radii tend to stabilize after an initial increase. These discoveries enable a thorough analysis of the changes in side friction and base resistance of postgrouted piles in collapsible loess. Furthermore, they provide valuable references and guidance for the implementation of the pile-base postgrouting technique in loess areas.
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Data Availability Statement
All data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Numbers U22A20598 and 52279113) and the Key Scientific and Technological Project of Henan Province (Grant Number 222102320097).
References
Au, S. K. A., K. Soga, M. R. Jafari, M. D. Bolton, and K. Komiya. 2003. “Factors affecting long-term efficiency of compensation grouting in clays.” J. Geotech. Geoenviron. Eng. 129 (3): 254. https://doi.org/10.1061/(ASCE)1090-0241(2003)129:3(254).
Bouchelaghem, F., and A. Almosni. 2003. “Experimental determination of the longitudinal dispersivity during the injection of a micro-cement grout in a one-dimensional soil column.” Transp. Porous Media 52 (1): 67–94. https://doi.org/10.1023/A:1022376225651.
Bruce, D. A. 1986. “Enhancing the performance of large diameter piles by grouting.” Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 23 (4): 240. https://doi.org/10.1016/0148-9062(86)92518-0.
Cao, W. P., and M. Zhao. 2012. “Experimental study of negative skin friction for man-made cast-in-situ belled piles in loess soil foundation.” Chin. J. Rock Mech. Eng. 31 (A01): 3167–3173. https://doi.org/10.3969/j.issn.1000-6915.2012.z1.077.
Chen, M. H., Y. H. Luo, X. Y. Wang, and X. Zhang. 2023. “Experimental study on water infiltration law of loess foundation.” Geotech. Eng. Tech. 37 (1): 95–99. https://doi.org/10.3969/j.issn.1007-2993.2023.01.017.
Chen, P. Y. 2018. “Research progress on PFC2D simulation of crack propagation characteristics of cracked rock.” J. Eng. Geol. 26 (2): 528–539. https://doi.org/10.13544/j.cnki.jeg.2017-039.
Dai, G., W. Gong, X. Zhao, and X. Zhou. 2011. “Static testing of pile-base post-grouting piles of the Suramadu bridge.” Geotech. Test. J. 34 (1): 34–49. https://doi.org/10.1520/GTJ102926.
Fan, W., Y. N. Wei, B. Yu, L. S. Deng, and N. Y. Yu. 2022. “Research progress and prospect of loess collapsible mechanism in micro-level.” Hydrogeol. Eng. Geol. 49 (5): 144–156. https://doi.org/10.16030/j.cnki.issn.1000-3665.202108064.
Fang, K., T. B. Zhao, Y. L. Tan, and Y. Qiu. 2019. “Prediction of grouting penetration height along the shaft of base grouted pile.” J. Mar. Sci. Eng. 7 (7): 212. https://doi.org/10.3390/jmse7070212.
Fleming, W. G. K. 1993. “The improvement of pile performance by base grouting.” Proc. Inst. Civ. Eng. Civ. Eng. 97 (2): 88–93. https://doi.org/10.1680/icien.1993.23262.
Fu, Y., X. Wang, S. Zhang, and Y. Yang. 2019. “Modelling of permeation grouting considering grout self-gravity effect: Theoretical and experimental study.” Adv. Mater. Sci. Eng. 2019: 7968240. https://doi.org/10.1155/2019/7968240.
Gang, Z., and X. S. Zhang. 2015. “Meso-mechanical simulation of fracture grouting using particle flow code in two dimensions.” J. Xiamen Univ. 54 (6): 905–912. https://doi.org/ 10.6043/j.issn.0438-0479.2015.06.028.
Geng, P., Z. K. Lu, T. Ding, Q. L. Quan, and Q. X. Yan. 2017. “Research on the dynamic process simulation of rock grouting based on particle flow.” J. Railway Eng. Soc. 34 (3): 34–40. https://doi.org/10.3969/j.issn.1006-2106.2017.03.007.
Guo, Q. Y., Y. L. Wang, W. L. Xie, and W. Shi. 2021. “Study on correlation between loess collapsibility and soil physical property index.” Northwest. Geol. 54 (1): 212–221. https://doi.org/10.19751/j.cnki.61-1149/p.2021.01.019.
Hou, F., K. Sun, Q. Wu, W. Xu, and S. Ren. 2019. “Grout diffusion model in porous media considering the variation in viscosity with time.” Adv. Mech. Eng. 11 (1): 1687814018819890.
Huang, S. G. 2006. “Study on rising height of grout along a pile after grouting and effect of grout on soils.” Rock Soil Mech. 27 (2): 779–783. https://doi.org/10.16285/j.rsm.2006.s2.053.
Huang, X. F., Z. H. Chen, S. Ha, and S. G. Xue. 2007. “Research on bearing behaviors and negative friction force for filling piles in the site of collapsible loess with big thickness.” Chin. J. Geotech. Eng. 29 (3): 338–346. https://doi.org/10.3321/j.issn:1000-4548.2007.03.005.
Kuang, J. Z. 2001. Geotechnical grouting theory and engineering examples. Beijing: Science Press.
Li, J., and Y. L. Xie. 2005. “Study of the proper pile length in the self-weight collapsible loess.” Chin. J. Rock Mech. Eng. 24 (9): 1629–1634. https://doi.org/10.3321/j.issn:1000-6915.2005.09.027.
Li, X. W., G. Jiang, J. M. Zai, and X. D. Wang. 2007. “The study of the nonlinear working mechanism of pile group.” Geotech. Invest. Surv. 11: 8–13, 75.
Liu, M. Z. 1999. “Calculation of negative friction of group piles on a site with self-weighted wetted loess interlayer.” Chin. J. Geotech. Eng. 21 (6): 749–752.
Liu, Z. D. 1997. Loess mechanics and engineering. 1st ed. Xi’an, China: Shaanxi Science and Technology Press.
Liu, Z. H., J. G. Zheng, J. W. Zhang, and C. J. Qi. 2014. “Method for post-construction settlement of pile foundation of bridges in collapsible loess area.” Chin. J. Geotech. Eng. 36 (2): 320–326.
McVay, M., S. Thiyyakkandi, J. Joiner, and V. Adams. 2010. Group efficiencies of grout-tipped drilled shafts and jet-grouted piles. Gainesville, FL: Dept. of Civil and Coastal Engineering, University of Florida.
Nguyen, V. L., L. Nie, and M. Zhang. 2013. “Method cement post-grouting to increase the load capacity for bored pile.” Res. J. Appl. Sci. Eng. Technol. 5 (19): 4727–4732. https://doi.org/10.19026/rjaset.5.4310.
Ovesen, N. K. 1979. “The use of physical models in design: The scaling law relationships.” In Proc., 7th European Conf. on Soil Mechanics and Foundation Engineering, 10–13. London, UK: British Geotechnical Society.
Pooranampillai, S., S. Elfass, W. Vanderpool, and G. Norris. 2010. “The effects of compaction post grouting of model shaft tips in fine sand at differing relative densities-experimental results.” In The art of foundation engineering practice, 486–500. Reston, VA: ASCE.
Ruiz, M. E., and M. A. Pando. 2009. “Load transfer mechanisms of tip post-grouted drilled shafts in sand.” In Contemporary topics in deep foundations, 23–30. Reston, VA: ASCE.
SAC (Standardization Administration of China). 2008. Technical code for building pile foundations. GB/JGJ 94-2008. Beijing: SAC.
SAC (Standardization Administration of China). 2015. Technical code for testing of building foundation piles. GB/JGJ 106-2014. Beijing: SAC.
SAC (Standardization Administration of China). 2019. Specifications for design of foundation of highway bridges and culverts. GB/JTJ 3363-2019. Beijing: SAC.
Song, W. 2019. “Study on influencing factors of vertical bearing capacity of bored cast-in-situ pile and promoting measures.” In Proc., 2019 Int. Conf. on Biomedical Sciences and Information Systems. Shijiazhuang, China: ICBSIS.
Terzaghi, K. 1942. “Soil moisture and capillary phenomena in soils.” In Hydrology, edited by O. E. Meinzer, 331–363. New York: McGraw Hill Book Co.
Thiyyakkandi, S., M. McVay, D. Bloomquist, and P. Lai. 2014. “Experimental study, numerical modeling of and axial prediction approach to base grouted drilled shafts in cohesionless soils.” Acta Geotech. 9 (3): 439–454. https://doi.org/10.1007/s11440-013-0246-3.
Wan, Z.-h., G.-l. Dai, and W.-m. Gong. 2019. “Field study on post-grouting effects of cast-in-place bored piles in extra-thick fine sand layers.” Acta Geotech. 14 (5): 1357–1377. https://doi.org/10.1007/s11440-018-0741-7.
Wan, Z.-h., G.-l. Dai, and W.-m. Gong. 2020. “Field and theoretical analysis of response of axially loaded grouted drilled shafts in extra-thick fine sand.” Can. Geotech. J. 57 (3): 391–407. https://doi.org/10.1139/cgj-2018-0382.
Wang, C. D., X. Wang, S. H. Zhou, and B. L. Wang. 2010. “Centrifugal model tests on self-weight collapsible loess and negative skin friction of pile foundations.” Chin. J. Rock Mech. Eng. 29 (A01): 3101–3107.
Wang, C. H. 1994. “Some discussions on indoor pile modeling methods.” In Proc., 7th Conf. on Soil Mechanics and Foundation Engineering, 437–441. Beijing: China Civil Engineering Society.
Wang, X. Z., W. M. Gong, G. Y. Xue, and C. Y. Li. 2004. “Current research status and development of the pile-end post-grouting technology.” Constr. Technol. 33 (5): 28–31. https://doi.org/10.3969/j.issn.1002-8498.2004.05.009.
Wei, Z. X., D. W. XIe, C. D. Yuan, W. L. Ma, Y. Li, and Y. Li. 2022. “Experiment and simulation of soil water characteristic curve of unsaturated cohesive foundation soil.” Port Waterw. Eng. 1: 179–185, 203.
Xiong, C. F., F. Xu, H. M. Feng, and Z. J. Zhou. 2022. “Laboratory model test study on optimization of post grouting at the end of bridge cast-in-place pile in loess area.” J. Railway Sci. Eng. 19 (6): 1585–1593. https://doi.org/10.19713/j.cnki.43-1423/u.T20210747.
Xu, G. M., and W. M. Zhang. 1996. “Tudy on particle size effect and boundary effect in centrifuge model.” Chin. J. Geotech. Eng. 18 (3): 80–86.
Xu, K., C. F. Zhao, M. Yu, Y. Fei, J. N. Shi, and R. L. Qin. 2019. “The experimental model pile test study of post grouting compressive pile in homogeneous sandy soil.” China Civ. Eng. J. s2: 81–88. https://doi.org/10.15951/j.tmgcxb.2019.s2.012.
Xu, S. C., D. R. Liu, X. Wang, Z. S. An, Z. J. Zhang, and X. Jin. 2023. “Model test study on infiltration law of remolded unsaturated loess.” Hydro-Sci. Eng. 1: 140–148. https://doi.org/10.12170/20210903001.
Xu, W., X. X. Wu, and S. R. Zhao. 1999. “Experimental study on the compaction grouting of pile tip in loess region.” J. Southwest Jiaotong Univ. 34 (1): 18–23.
Xue, Z. N., H. M. Feng, and C. N. Ren. 2021. “Model test of lateral and end combined grouting of bridge cast-in-place pile foundation in loess area.”.” J. Chang'an Univ. 41 (6): 19–28. https://doi.org/10.19721/j.cnki.1671-8879.2021.06.003.
Yang, J., Y. Cheng, and W. Chen. 2019. “Experimental study on diffusion law of post-grouting slurry in sandy soil.” Adv. Civ. Eng. 2019: 3493942. https://doi.org/10.1155/2019/3493942.
Yang, Z. Q., K. P. Hou, Y. Cheng, and B. J. Yang. 2014a. “Study of column-hemispherical penetration grouting mechanism based on power-law fluid.” Chin. J. Rock Mech. Eng. 33 (2): 3840–3846. https://doi.org/10.13722/j.cnki.jrme.2014.s2.057.
Yang, Z. Q., K. P. Hou, W. Liang, Y. Cheng, and B. J. Yang. 2014b. “Study of diffusion parameters of Newtonian fluid based on column-hemispherical penetration grouting.” Rock Soil Mech. 35 (2): 17–24.
Yang, Z. Q., X. D. Niu, K. P. Hou, Y. H. Guo, Z. Z. Zhou, F. Chen, and Y. H. Kang. 2015. “Study on diffusion parameters of Bingham fluid based on column-hemispherical penetration grouting.” J. Sichuan Univ. 47: 47–53. https://doi.org/10.15961/j.jsuese.2015.s2.008.
Zhang, F., B. Damjanac, and H. Huang. 2013. “Coupled discrete element modeling of fluid injection into dense granular media.” J. Geophys. Res. B: Solid Earth 118 (6): 2703–2722. https://doi.org/10.1002/jgrb.50204.
Zhang, H., G. B. Liu, and Y. Zhou. 2021. “Experimental study on enhancement mechanism of bearing capacity of base post-grouting cast-in-situ pile.” J. Ningbo Univ. 34 (4): 72–78. https://doi.org/10.3969/j.issn.1001-5132.2021.04.012.
Zhang, J. 2022. “Numerical simulation of fracture grouting in loess.” Value Eng. 41 (16): 89–92. https://doi.org/10.3969/j.issn.1006-4311.2022.16.029.
Zhang, Z. L., Z. S. Shao, X. B. Fang, and X. J. Lian. 2018. “Research on the fracture grouting mechanism and PFC numerical simulation in loess.” Adv. Mater. Sci. Eng. 2018 (1): 4784762.
Zhang, Z. M., S. M. Wu, and F. Bao. 1999. “Study of mechanism and application on bored pile base grouting.” Chin. J. Geotech. Eng. 21 (6): 681–686.
Zhao, C. F., Y. Wu, C. Zhao, Y. Fei, and Y. B. Wang. 2019. “Indoor model tests on the compressive bearing behavior of a single pile in clay with pile end post-grouting.” J. Tianjin Univ. 52 (12): 1235–1244. https://doi.org/10.11784/tdxbz201901057.
Zheng, A.-r., Z.-j. Chen, and A.-j. Zhuge. 2019. “Pile load test of post-grouting bored pile at Beijing capital international airport.” IOP Conf. Ser.: Earth Environ. Sci 267 (5): 052060. https://doi.org/10.1088/1755-1315/267/5/052060.
Zhou, J., J. J. Guo, Z. Zhang, and M. C. Jia. 2010. “Model test of single pile static load in sands and numerical simulation using particle flow code.” Rock Soil Mech. 31 (6): 1763–1768.
Zhou, Z., and Y. Xie. 2019. “Experiment on improving bearing capacity of pile foundation in loess area by postgrouting.” Adv. Civ. Eng. 2019: 9250472. https://doi.org/10.1155/2019/9250472.
Zhu, Y. P., T. S. Zhao, and C. L. Chen. 2013. “Field tests on changes of pile negative friction along its length.” Rock Soil Mech. 34 (1): 265–272.
Zong, X. M., X. P. Zhou, and J. Di. 2011. “Tests in side friction around the pile collapsible loess layers.” J. Disaster Prev. Mitigation Eng. 31 (6): 710–716. https://doi.org/10.3969/j.issn.1672-2132.2011.06.020.
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International Journal of Geomechanics
Volume 24 • Issue 9 • September 2024
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© 2024 American Society of Civil Engineers.
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Received: Sep 17, 2023
Accepted: Mar 4, 2024
Published online: Jun 24, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 24, 2024
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