|Table of Contents|

Calculation Method of Ultimate Bearing Capacity of Bridge Pile Foundation in Loess Gully Area Considering Scour Effect(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2020年04期
Page:
108-115
Research Field:
Publishing date:

Info

Title:
Calculation Method of Ultimate Bearing Capacity of Bridge Pile Foundation in Loess Gully Area Considering Scour Effect
Author(s):
XIE Gang1;  LIU Hai-peng2; 3;  ZHAO Bao-jun3; 4;  WANG Xu-dong3;  WANG Ding3
(1. Shaanxi Road & Bridge Group Co., Ltd, Xi'an 710075, Shaanxi, China; 2. Shaanxi Province Railway Group Co., Ltd, Xi'an 710199, Shaanxi, China; 3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 4. Shaanxi Provincial Communication Construction Group, Xi'an 710075, Shaanxi, China)
Keywords:
bridge engineering;  loess valley topography;  pile foundation;  ultimate bearing capacity;  erosion effect
PACS:
TU443
DOI:
10.19815/j.jace.2020.04063
Abstract:
According to the topographic characteristics of the loess valley and the pile type characteristics of the supporting project, the vertical bearing capacity calculation model of bridge pile foundation considering the slope coefficient, critical slope distance and scouring depth was established. Based on FLAC3D software, the adverse effects of water erosion and slope soil cutting on the vertical ultimate bearing capacity of pile foundation were analyzed. Regression equation fitting was carried out, and the calculation formula of vertical bearing capacity of pile foundation in loess valley area was established. The results show that the slope coefficient has a significant coupling relationship with the slope distance in pile foundation bearing capacity calculation, and the correlation of the bridge pile foundation side friction to corresponding factor increases with its decrease. The effect of scour and steep slope topography on the pile end friction is weak, but the effect on the pile side friction is large. The vertical ultimate bearing capacity of the pile foundation has a negative correlation with the depth of water scour. The lower the depth value is, the greater the influence of each stage of scour is. Compared with the model test results, the influence degree deviation of the formula is smaller, and the formula has good accuracy and practicability, which can provide reference for the design and calculation of similar pile foundation.

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Last Update: 2020-07-29