Vertical bearing capacity calculation method ofpile foundation in Loess Gully Region(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年01期
- Page:
- 99-106
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Vertical bearing capacity calculation method ofpile foundation in Loess Gully Region
- Author(s):
- DUAN Rui-fang; WANG Ding; HAN Jun-duo ; WANG Xiao-ming
- (1. School of Highway and Railway Engineering, Shaanxi College of Communication Technology, Xian 710018,Shaanxi, China; 2. Key Laboratory of Bridge Detection Reinforcement Technology of Ministry of Communication,Xian 710064, Shaanxi, China; 3. Rizhao City Highway Bureau, Rizhao 276800, Shandong, China;4. CCCC First Highway Consultants CO., LTD., Xian 710075， Shaanxi， China)
- Keywords:
- bridge engineering; steep slope; vertical bearing capacity; slope coefficient; slope distance; pile foundation; Loess Gully Region
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to control the cost of road construction and meet the requirments of road alignment, the bridge pile foundation in the Loess Gully Area was built on a steep slope. Pile foundations built on steep slopes were unsafe when calculating the vertical ultimate bearing capacity of pile foundations in Loess Gully Region, because of the lack of soil failure and the weakening effect of soil pressure on pile side, which reduces the vertical bearing capacity of pile foundations. Based on the soil properties and pile type characteristics of background engineering in Loess Gully Region and the vertical bearing mechanism of pile foundation on steep slope, a calculation model of vertical bearing capacity of pile foundation in Loess Gully Region considering the coupling effect of slope coefficient and distance between adjacent slope was established. FLAC 3D finite difference calculation software was used to study the influence of soil failure and weakening effect on the bearing capacity of pile foundation on steep slope terrain. The formula for calculating the bearing capacity of vertical pile foundation on Loess Gully terrain was established by regression fitting method. The results show that the influence of Loess Gully topography on pile tip friction can be neglected, but the influence on pile side friction can not be neglected. The influence of slope coefficient and slope spacing on the bearing capacity of pile foundation shows a coupling relationship. The pile side friction increases with the increase of slope spacing and slope coefficient, and the increase of side friction becomes slower and slower. When the slope spacing is 1D, the slope coefficient increases from 0.57 to 1.00, the side friction increases by 91.6%, and when the slope coefficient increases from 1.73 to 3.73, the side friction increases by 22.2%. When the slope spacing is 10d, the slope coefficient increases from 0.57 to 1.00, the side friction increases by 37.4%, and when the slope coefficient increases from 1.73 to 3.73, the side friction increases by 18.3%. The calculation results of the bearing capacity of vertical pile foundation presented in this paper are with those of numerical simulation. The formula has a good application background and can provide a reference for the calculation of similar pile foundations. 6 tabs, 11 figs, 18 refs.
Last Update: 2019-01-28