Study on bearing capacity characteristics of rock socketed short pile in weathered rock site

  • Xinyuan Li
  • Xiaoyu Bai
  • Minyi Zhang
Keywords: bearing behaviour, in situ test, rock socketed short pile, strong weathered granite, ultimate bearing capacity,


The bearing behaviour and load transfer mechanism of the rock socketed short pile were studied by the test and FEM of two different cases of 11 single short piles in a weathered rock foundation in Qingdao. The influences of aspect ratio and rock socketed length on the bearing behaviours of rock socketed short piles were discussed by FEM. The results show that the ultimate bearing capacity of rock socketed short piles is higher, and settlement is smaller, which means that they can satisfy the engineering demands and have high security reserves. Moreover, a change in the ultimate bearing capacity is not easily noticed with increasing of pile lengths, which demonstrates that the 11 piles have strong end bearing properties. The pile side friction peak decreases with an increase of the aspect ratio, as does the pile top settlement. Under different rock socketed lengths, the attenuation law of axial force is consistent; the pile top settlement decreases with the increase of rock-socketed length, and the ratio of base resistances to the bearing capacities decreases with the increase of the length. The research results can provide references for rock socketed short pile design in similar geological conditions.


Armaghani DJ, Freadonbeh DJ, Faradonbeh RS, Rezaei H, et al. 2016. Settlement prediction of the rock-socketed piles through a new technique based on gene expression programming. Neural Computing and Applications, 1-11. DOI: 10.1007/s00521-016-2618-8

Cho C, Heo Y, Bae W. 2014. Behavior Characteristics of helical pile in granite residual soil. Journal of the Korean Geoenvironmental Society, 14(3): 41-49.

Fellenius BH, Harris DE, Anderson DG. 2004. Static loading test on a 45m long pipe pile in Sandpoint Idaho. Canadian Geotechnical Journal, 41(4): 613-628. DOI: 10.1139/t04-012

Hassan KM, O'Neill MW. 1997. Side load-transfer mechanisms in drilled shafts in soft argillaceous rock. Journal of Geotechnical and Geoenvironmental Engineering, 123(2): 145-152. DOI: 10.1061/(ASCE)1090-0241(1997)123:2(145)

Kwon OK, Kim JB, Kweon HM. 2014. An experimental study on the resistance and movement of short pile installed in sands under horizontal pullout load. International Journal of Naval Architecture and Ocean Engineering, 6(1): 87-97. DOI: 10.2478/ijnaoe-2013-0165

Leong EC, Randolph MF. 1994. Finite element modeling of rock-socketed piles. International Journal for Numerical and Analytical Methods in Geomechanics, 18(1): 25-47. DOI: 10.1002/nag.1610180103

Madhusudhan BN, Baudet BA, Ferreira PMV, et al. 2017. Performance of fiber reinforcement in completely decomposed granite. Journal of Geotechnical and Geoenvironmental Engineering, 143(8): 04017038. DOI: 10.1061/(ASCE)GT.1943-5606.0001716

Musarra M, Massad F. 2015. Static load tests in an instrumented rock socket barrette pile. Soils and Rocks, 38(2): 163-177.

Rowe RK, Armitage HH. 1987. Theoretical solutions for axial deformation of drilled shafts in rock. Canadian Geotechnical Journal, 24(1): 114-125.

Xia X, Li H-B, Li J-C, et al. 2013. A case study on rock damage prediction and control method for underground tunnels subjected to adjacent excavation blasting. Tunnelling and Underground Space Technology, 35: 1-7. DOI: 10.1016/j.tust.2012.11.010

Civil Engineering (1)