Open AccessAnalysis of the penetration mechanism of CPTU based on large deformation finite element
Author(s) -
Hongchao Hao,
Lingqiang Yang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/371/2/022076
Subject(s) - penetration (warfare) , geotechnical engineering , penetration test , conical surface , pore water pressure , cone penetration test , finite element method , geology , penetration depth , materials science , engineering , structural engineering , composite material , subgrade , operations research , physics , optics
The Piezocone Penetration Test (CPTU) is a new in-situ testing technology developed in the 1980s. Compared with the traditional Cone Penetration Test (CPT), it has the advantages of high precision, large amount of data, good stability and wide application. Because of the short history of pore pressure static penetration (CPTU) technology, the CPTU develops slowly in China. By the large deformation, finite element simulation method is used to numerically simulate the CPTU penetration process in ABAQUS software; and the distribution and variation characteristics of soil stress, strain and pore pressure field at different penetration depths are studied. The results show that during the penetration of the cone, there is a stress concentration zone around the cone. The resistance of the cone is mainly the resistance below the cone tip. When the penetration is shallow, the soil is disturbed with the penetration. As the depth increases, the disturbance becomes smaller; according to the variation of the pore water pressure, the water permeable element can be placed at the junction of the conical head and the conical body.