Abstract
The static drill rooted nodular pile is a new type of pile foundation which consists of precast nodular pile and the cemented soil along the pile shaft. The pile foundation not only reduces the compacting effects and mud pollution, but also combines the advantages of the relatively high skin friction of the cemented soil and the higher strength of the precast pile. As the mechanism of the shaft resistance softening of such super-long piles is not clear, existing general finite element software can not reflect the softening of soil. Therefore, a new hyperbolic load transfer model considering the shaft resistance softening is proposed in this paper and corresponding UMAT subprogram is developed in FORTRAN language, which forms the integration model of load transfer model and subprogram. The curves of Q-s relationship of pile’s top, the distribution of pile’s skin friction and the relationship of pile’s skin friction versus pile-soil relative movement calculated by the proposed model are highly consistent with the field test data. In this paper, the mechanical behavior can be calculated by the proposed model accurately and effectively. At the same time, this new type of static drilling rooted nodular pile can make the bearing capacity of super long piles to be mobilized effectively.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Du Y, Zheng G, Zhang L (2014) Theoretical analysis of comprehensive coefficient of pile compression for super-long bored pile considering effect of deep excavation [J]. Rock Soil Mech 35(7):2019–2028
Fei K, Zhang JW (2009) ABAQUS in geotechnical engineering. China Water Power Press, Beijing (in Chinese)
Honda T, Hirai Y, Sato E (2011) Uplift capacity of belled and multi-belled piles in dense sand[J]. Soils Found 51(3):483–496
Li H, Tong L (2018) Parameter sensitivity of horizontal bearing characteristics of large diameter and super-long bored pile [J]. Rock Soil Mech 39(5):00–09
Horiguchi T, Karkee MB (1995) Load tests on bored PHC nodular piles in different ground conditions and the bearing capacity based on simple soil parameters [J]. Proc Tech Rep Jpn Architectural Soc 1:89–94
Huang H, Zhang, Yang XQ (2002) Experimental study of mechanical properties of cemented-soil [J]. J Taiyuan Univ Technol 36(6):705–709
Randolph MF, Wroth CP (1978) Analysis of deformation of vertically loaded piles [J]. J Geotechn Eng ASCE 104(2):1467–1488
Yao W, Yin W (2010) Numerical simulation and study for super-long pile group under axis and lateral loads [J]. Adv Struct Eng 13(6):1139–1151
Yao W, Liu Y, Chen J (2012) Characteristics of negative skin friction for superlong piles under surcharge loading [J]. Int J Geomech ASCE 12(2):90–97
Zhou J, Wang K (2014) Bearing capacity and load transfer mechanism of static drill rooted nodular piles [J]. Rock Soil Mech 35(5):1367–1376
Author information
Authors and Affiliations
Corresponding author
Additional information
Editorial handling: Murat Karakus
Electronic supplementary material
ESM 1
(FOR 6 kb)
Rights and permissions
About this article
Cite this article
Yao, Wj., Lu, W., Cai, Cy. et al. The analysis model of shaft resistance softening of a new type of static drill rooted super-long nodular pile. Arab J Geosci 12, 169 (2019). https://doi.org/10.1007/s12517-019-4320-5
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s12517-019-4320-5