Abstract
Failure of an excavation support structure will inevitably result in stress state changes and ground settlements behind the wall, affecting the serviceability of adjacent structures. Such excavation-induced effects on existing piled rafts received little attention in the literature. This paper aims to investigate the load-settlement behaviour of existing disconnected piled rafts (DPR) with unequal pile lengths that were arranged beneath the cushion in various practical configurations. The DPRs were subjected to a passive loading triggered by an adjacent rigid retaining wall movement. ABAQUS was utilized to carry out the three-dimensional finite element analyses. The numerical approach was validated by experimental studies on DPRs with 2 × 2 long and short rigid piles close to a rotating retaining wall. The results show that the arrangement of the group’s long and short piles has a significant impact on the overall settlement and tilting of the raft. An increased number of long piles close to the wall helps to recede the additional foundation settlement caused by the wall movement. The stiffness of the foundation soil effects the load-settlement response as well. The stiffer the subsoil, the greater the proportion of the applied working load carried by the soil prior to wall movement and the larger the amount released as the wall movement progresses. The vertical loading history prior to wall movement significantly affects the foundation settlement behaviour, with wall movement causing the 3 × 3 piled raft’s settlement to increase by up to 21.7% for a working load increase from 180 to 900 kPa.
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References
Asefa B, Assefa E, Pantelidis L, Sachpazis C (2021) Pile configuration optimization on the design of combined piled raft foundations. Model Earth Syst Environ. https://doi.org/10.1007/s40808-021-01318-x
Ata A, Badrawi E, Nabil M (2015) Numerical analysis of unconnected piled raft with cushion. Ain Shams Eng J 6:421–428. https://doi.org/10.1016/j.asej.2014.11.002
Boroujeni FF, Porhoseini R (2022) Effect of execution process on pile group-excavation interaction. Int J Geotech Eng 16:632–640. https://doi.org/10.1080/19386362.2020.1778155
Boussetta S, Bouassida M, Dinh A et al (2012) Physical modeling of load transfer in reinforced soil by rigid inclusions. Int J Geotech Eng 6:331–342. https://doi.org/10.3328/IJGE.2012.06.03.331-341
Boussetta S, Bouassida M, Zouabi M (2016) Assessment of observed behavior of soil reinforced by rigid inclusions. Innov Infrastruct Solut 1:27. https://doi.org/10.1007/s41062-016-0027-6
Cao W, Zhang H, Liu T, Tan X (2020) Analytical solution for the active earth pressure of cohesionless soil behind an inclined retaining wall based on the curved thin-layer element method. Comput Geotech 128:103851. https://doi.org/10.1016/j.compgeo.2020.103851
Chai J, Shen S, Ding W et al (2014) Numerical investigation of the failure of a building in Shanghai, China. Comput Geotech 55:482–493. https://doi.org/10.1016/j.compgeo.2013.10.001
Chanda D, Saha R, Haldar S (2022) Influence of combined loading on static response of optimum CPRF with non-uniform pile length configurations. Innov Infrastruct Solut 7:170. https://doi.org/10.1007/s41062-022-00778-z
Chen H, Li J, Yang C, Feng C (2020) A theoretical study on ground surface settlement induced by a braced deep excavation. Eur J Environ Civ Eng. https://doi.org/10.1080/19648189.2020.1739563
Cheng K, Riqing X, Ying H et al (2020) Simplified method for calculating ground lateral displacement induced by foundation pit excavation. Eng Comput 37:2501–2516. https://doi.org/10.1108/EC-08-2019-0350
Deb P, Pal SK (2020) Load-settlement and load-sharing behaviour of a piled raft foundation resting on layered soils. Acta Geotech Slov 17:71–86. https://doi.org/10.18690/actageotechslov.17.1.71-86.2020
El-Garhy BM (2022) A simplified method for the nonlinear analysis of composite piled raft foundation. Geotech Geol Eng. https://doi.org/10.1007/s10706-022-02159-w
Franza A, Marshall AM, Jimenez R (2019) Non-linear soil–pile interaction induced by ground settlements: pile displacements and internal forces. Géotechnique. https://doi.org/10.1680/jgeot.19.P.078
Fu Q, Li L (2021) Vertical load transfer behavior of composite foundation and its responses to adjacent excavation: centrifuge model test. Geotech Test J 44:20180237. https://doi.org/10.1520/GTJ20180237
Guo YC, Zhang SH, Shi G, Liu N (2011) Optimization strategy of the long-short-pile composite foundation based on the settlement control. Adv Mater Res 243–249:2429–2434. https://doi.org/10.4028/www.scientific.net/AMR.243-249.2429
Guo Y, Gu S, Jin J, Li M (2021a) Study on the earth pressure of a foundation pit adjacent to a composite foundation with rigid-flexible and long-short piles. PLoS ONE 16:e0251985. https://doi.org/10.1371/journal.pone.0251985
Guo Y, Lv C, Hou S, Liu Y (2021b) Experimental study on the pile-soil synergistic mechanism of composite foundation with rigid long and short piles. Math Probl Eng 2021:1–15. https://doi.org/10.1155/2021/6657116
Halder P, Manna B (2020) Performance evaluation of piled rafts in sand based on load-sharing mechanism using finite element model. Int J Geotech Eng. https://doi.org/10.1080/19386362.2020.1729297
Halder P, Manna B (2021) Load transfer mechanism for connected and disconnected piled raft: a comparative study. Acta Geotech. https://doi.org/10.1007/s11440-021-01409-0
Horikoshi K, Randolph MF (1997) On the definition of raft—soil stiffness ratio for rectangular rafts. Géotechnique 47:1055–1061. https://doi.org/10.1680/geot.1997.47.5.1055
Juang CH, Gong W, Martin JR, Chen Q (2018) Model selection in geological and geotechnical engineering in the face of uncertainty—Does a complex model always outperform a simple model? Eng Geol 242:184–196. https://doi.org/10.1016/j.enggeo.2018.05.022
Karira H, Kumar A, Ali TH et al (2022) A parametric study of settlement and load transfer mechanism of piled raft due to adjacent excavation using 3D finite element analysis. Geomech Eng 30:169–185. https://doi.org/10.12989/gae.2022.30.2.169
Ko J, Cho J, Jeong S (2018) Analysis of load sharing characteristics for a piled raft foundation. Geomech Eng 16:449–461. https://doi.org/10.12989/GAE.2018.16.4.449
Korff M, Mair RJ, Van Tol FAF (2016) Pile-soil interaction and settlement effects induced by deep excavations. J Geotech Geoenviron Eng 142:04016034. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001434
Lai F, Yang D, Liu S et al (2022) Towards an improved analytical framework to estimate active earth pressure in narrow c–ϕ soils behind rotating walls about the base. Comput Geotech 141:104544. https://doi.org/10.1016/j.compgeo.2021.104544
Li L, Huang J, Han B (2018) Centrifugal investigation of excavation adjacent to existing composite foundation. J Perform Constr Facil 32:04018044. https://doi.org/10.1061/(ASCE)CF.1943-5509.0001188
Li M, Qian Y, Guo Y et al (2019) Design of lateral soil pressure model test scheme for adjacent composite foundation. Mech Eng 41:157–163. https://doi.org/10.6052/1000-0879-18-418
Liang F, Song Z (2014) BEM analysis of the interaction factor for vertically loaded dissimilar piles in saturated poroelastic soil. Comput Geotech 62:223–231. https://doi.org/10.1016/j.compgeo.2014.07.016
Liang Y-Y, Liu N-W, Yu F et al (2019) Prediction of response of existing building piles to adjacent deep excavation in soft clay. Adv Civ Eng 2019:1–11. https://doi.org/10.1155/2019/8914708
Liang F, Li T, Qian Y et al (2021) Investigating the seismic isolation effect of the cushioned pile raft foundation in soft clay through dynamic centrifuge tests. Soil Dyn Earthq Eng 142:106554. https://doi.org/10.1016/j.soildyn.2020.106554
Lin L, Hanna A, Sinha A, Tirca L (2017) High-rise building subjected to excessive settlement of its foundation: a case study. Int J Struct Integr 8:210–221. https://doi.org/10.1108/IJSI-05-2016-0019
Liu W, Yang X, Zhang S et al (2019) Analysis of deformation characteristics of long-short pile composite foundation in salt lake area Iran. Adv Civ Eng 2019:1–15. https://doi.org/10.1155/2019/5976540
Liu J, Shi C, Cao C et al (2020) Improved analytical method for pile response due to foundation pit excavation. Comput Geotech 123:103609. https://doi.org/10.1016/j.compgeo.2020.103609
Liu S, Zhang Q, Cui C et al (2021a) A simplified approach for the response of pile groups composed of dissimilar piles. Structures 34:4548–4559. https://doi.org/10.1016/j.istruc.2021.10.063
Liu S, Zhang Q, Feng R (2021b) Model test study on bearing capacity of nonuniformly arranged pile groups. Int J Geomech 21:04021200. https://doi.org/10.1061/(ASCE)GM.1943-5622.0002181
Liyanapathirana DS, Nishanthan R (2016) Influence of deep excavation induced ground movements on adjacent piles. Tunn Undergr Space Technol 52:168–181. https://doi.org/10.1016/j.tust.2015.11.019
Ma T, Zhu Y, Yang X (2020) Calculation of bearing capacity and deformation of composite pile foundation with long and short piles in loess areas. Adv Civ Eng 2020:1–10. https://doi.org/10.1155/2020/8829779
Maleki M, Imani M (2022) Active lateral pressure to rigid retaining walls in the presence of an adjacent rock mass. Arab J Geosci 15:152. https://doi.org/10.1007/s12517-022-09454-z
Malekkhani MJ, Bazaz JB (2021) An analytical model to study the behavior of non-connected piled rafts with granular cushion subjected to vertical load. Int J Civ Eng 19:941–956. https://doi.org/10.1007/s40999-021-00611-1
Mali S, Singh B (2020) 3D numerical modeling of large piled-raft foundation on clayey soils for different loadings and pile-raft configurations. Stud Geotech Mech 42:1–17. https://doi.org/10.2478/sgem-2019-0026
Mu L, Chen W, Huang M, Lu Q (2020) Hybrid method for predicting the response of a pile-raft foundation to adjacent braced excavation. Int J Geomech 20:04020026. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001627
Nakanishi K, Takewaki I (2013) Optimum pile arrangement in piled raft foundation by using simplified settlement analysis and adaptive step-length algorithm. Geomech Eng 5:519–540. https://doi.org/10.12989/GAE.2013.5.6.519
National standard of the People's Republic of China (JGJ 79–2012) (2012) Technical code for ground treatment of buildings. China Architecture & Building Press, Beijing, China
National standard of the People's Republic of China (GB/T 50123–2019) (2019) Standard for geotechnical testing method. China Planning Press, Beijing, China
Ng CWW, Shi JW, Lei GH et al (2016) Modelling the effects of strain—and path-dependent soil stiffness on soil-structure interaction problems: an engineer’s perspective. Kuala Lumpur, Malaysia, pp 111–124
Ng CWW, Shakeel M, Wei J, Lin S (2021) Performance of existing piled raft and pile group due to adjacent multipropped excavation: 3d centrifuge and numerical modeling. J Geotech Geoenviron Eng 147:04021012. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002501
Nishanthan R, Liyanapathirana DS, Leo CJ (2016) Shielding effect in pile groups adjacent to deep unbraced and braced excavations. Int J Geotech Eng. https://doi.org/10.1080/19386362.2016.1200270
Pham QN, Ohtsuka S, Isobe K, Fukumoto Y (2019) Group effect on ultimate lateral resistance of piles against uniform ground movement. Soils Found 59:27–40. https://doi.org/10.1016/j.sandf.2018.08.013
Poulos HG (2016) Tall building foundations: design methods and applications. Innov Infrastruct Solut 1:10. https://doi.org/10.1007/s41062-016-0010-2
The professional standard of the People’s Republic of China JGJ106-2014 (2014) Technical code for testing of building foundation piles. China Building Industry Press, Beijing
The professional standard of the People’s Republic of China JGJ340-2015 (2015) Technical code for testing building foundation soils. China Building Industry Press, Beijing
Rui R, Han J, Ye Y et al (2020) Load transfer mechanisms of granular cushion between column foundation and rigid raft. Int J Geomech 20:04019139. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001539
Saeedi Azizkandi A, Rasouli H, Baziar MH (2019) Load sharing and carrying mechanism of piles in non-connected pile rafts using a numerical approach. Int J Civ Eng 17:793–808. https://doi.org/10.1007/s40999-018-0356-2
Samanta M, Bhowmik R (2019) 3D numerical analysis of piled raft foundation in stone column improved soft soil. Int J Geotech Eng 13:474–483. https://doi.org/10.1080/19386362.2017.1368139
Soomro MA, Mangi N, Cheng W-C, Mangnejo DA (2020) The effects of multipropped deep excavation-induced ground movements on adjacent high-rise building founded on piled raft in sand. Adv Civ Eng 2020:1–12. https://doi.org/10.1155/2020/8897507
Tradigo F, Pisanò F, di Prisco C (2016) On the use of embedded pile elements for the numerical analysis of disconnected piled rafts. Comput Geotech 72:89–99. https://doi.org/10.1016/j.compgeo.2015.11.005
Uba Uge B, Guo Y (2020) Deep foundation pit excavations adjacent to disconnected piled rafts: a review on risk control practice. Open J Civ Eng 10:270–300. https://doi.org/10.4236/ojce.2020.103023
Uba Uge B, Guo Y-C (2021) Experimental study on load sharing characteristics of long-short CFG pile composite foundation adjacent to rigid retaining wall rotating about its base. J Eng Res. https://doi.org/10.36909/jer.13241
Uge BU, Guo Y-C (2020) CFG pile composite foundation: its engineering applications and research advances. J Eng 2020:1–26. https://doi.org/10.1155/2020/5343472
Wang G, Yang Y (2013) Effect of cantilever soldier pile foundation excavation closing to an existing composite foundation. J Cent South Univ 20:1384–1396. https://doi.org/10.1007/s11771-013-1626-4
Wang L, Zhao Q, Mao J et al (2021) Bearing capacity and simplified calculation approach for large-diameter plain-concrete piles. Arab J Geosci 14:1480. https://doi.org/10.1007/s12517-021-07845-2
Xie Y, Chi S (2020) Optimization method of reducing the differential settlements of piled raft foundations based on pile-to-pile interaction theory. Adv Civ Eng 2020:1–14. https://doi.org/10.1155/2020/1521876
Zhang W, Liu H (2022) Protection of adjacent infrastructures. Design of deep braced excavation and earth retaining systems under complex built environment. Springer, Singapore, pp 267–338
Zhang R, Zhang W, Goh ATC (2018) Numerical investigation of pile responses caused by adjacent braced excavation in soft clays. Int J Geotech Eng. https://doi.org/10.1080/19386362.2018.1515810
Zhang Q-Q, Liu S-W, Feng R-F et al (2020) Finite element prediction on the response of non-uniformly arranged pile groups considering progressive failure of pile-soil system. Front Struct Civ Eng 14:961–982. https://doi.org/10.1007/s11709-020-0632-5
Zhu X (2017) Analysis of the load sharing behaviour and cushion failure mode for a disconnected piled raft. Adv Mater Sci Eng 2017:1–13. https://doi.org/10.1155/2017/3856864
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The work presented in this article was part of the project supported by the National Natural Science Foundation of China (51508522).
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Guo, Y., Liu, Y., Wei, Y. et al. Load-Settlement Response of Cushioned Piled Rafts with Varying Pile Lengths to Retaining Wall Movement. Geotech Geol Eng 41, 3093–3113 (2023). https://doi.org/10.1007/s10706-023-02446-0
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DOI: https://doi.org/10.1007/s10706-023-02446-0