Load reduction experimental of high fill soil large diameter corrugated steel pipe culvert(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年03期
- Page:
- 1-9
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Load reduction experimental of high fill soil large diameter corrugated steel pipe culvert
- Author(s):
- WEI Rui; CAO Zhouyang; GU Anquan
- Keywords:
- -
- PACS:
- -
- DOI:
- -
- Abstract:
- This study investigated whether the expanded polystyrene (EPS) plate laid on the top of corrugated steel culverts could reduce the earth pressure at the top of the culvert, and the law of adjustment of soil pressure distribution. Based on Sichuan GuangBa (Guangyuan to Bazhong) Highway subgrade project, a field test on large diameter steel corrugated pipe culvert under high fill was carried out. Four characteristic sections were selected on the longitudinal culverts at the highest embankment of design fill. One of them was an unloaded section,the other three were load reduction sections for laying different thickness flexible materials (EPS plates) on top of the culverts. Simultaneously, stress and strain tests were carried out on the characteristic points of each section. The variation of stress and deformation with the height of the fill and the reducing effect of the EPS plate were studied in the two cases, where the steel corrugated pipe culvert had reducing load and did not have reducing load. The results show that at the unloaded section, the vertical earth pressure is greater than the soil column pressure when the height of the fill is less than 10 m. Conversely, it is less than the soil column pressure when the height of the fill is greater than 10 m. The ultimate vertical soil pressure coefficient is about 0.9. At the load reduction section, the vertical earth pressure is greater than the soil column pressure when the height of the fill is less than 5 m. Conversely, it is less than the soil column pressure when the height of the fill is greater than 5 m. The ultimate vertical soil pressure coefficient is about 0.46 to 0.47. When the steel corrugated pipe culvert is filled on both sides of the culvert, the deformation of the pipe culvert is characterized by lateral convergence and vertical arch. The deformation gradually changes with the increase of the fill height. The deformation of the culvert finally manifested as lateral bulging and vertical convergence. The vertical convergence of the unloaded section is slightly larger than that of the load reduction section. The final convergence rate is between 1% and 2%. In the two cases of load reduction or no load reduction, the vertical earth pressure at the top of the corrugated pipe culvert increased with the increase of fill height, but their amplitude of increase is decreasing. With the increase of fill height, the unloaded steel bellows gradually, exhibiting the mechanical characteristics of the flexible pipe and the ability to regulate the earth pressure. The EPS plate with flexible material is laid on the top of corrugated steel pipe culvert, which had a significant effect of reducing the load and regulating the distribution of soil pressure. The vertical earth pressure at the top of corrugated steel pipe culvert is a key factor affecting the final convergent deformation of culverts. 18 figs, 27 refs.
Last Update: 2018-06-12