Effect of cemented soil properties on the behavior of pre-bored grouted planted nodular piles under compression

• Published in: Journal of Zhejiang University. A. Science 2018-07, Vol.19 (7), p.534-543
• Main Authors: Zhou, Jia-Jin, Gong, Xiao-Nan, Wang, Kui-Hua, Zhang, Ri-Hong, Xu, Guo-Lin
• Format: Article
• Language: English
• Subjects: Axial forces; Cementing; Cements; Civil Engineering; Classical and Continuum Physics; Compression; Compression tests; Compressive strength; Engineering; Industrial Chemistry/Chemical Engineering; Mechanical Engineering; Model testing; Piles; Skin; Skin friction; Soil bearing capacity; Soil investigations; Soil properties; Soil strength; Soil testing
• ISSN: 1673-565X; 1862-1775
• DOI: 10.1631/jzus.A1700118

A series of unconfined compressive strength tests of cemented soil and a model test of a pre-bored grouted planted nodular (PGPN) pile were conducted to investigate the effect of cemented soil properties on the behavior of PGPN piles under compression. The load-displacement response, axial force, and tip resistance were measured during the loading process. Several conclusions could be drawn by comparing the results of the present model test with those of a previous test: the compressive bearing capacity of the PGPN pile was enhanced by increasing the cemented soil strength; the ultimate skin friction of the PGPN pile was increased to 1.06–1.36 times when the strength of the cemented soil along the pile shaft increased from 0.706 MPa to 1.21 MPa; the ultimate mobilized base load was increased to 1.42 times when the strength of the cemented soil at the enlarged base increased from 11.10 MPa to 16.02 MPa.