Study on Calculation Method of Larger Unbalanced Earth Pressure of Backfill behind Abutment in Integral Abutment Jointless Bridges
[1]SHAN Yulin,HUANG Fuyun,LUO Xiaoye,et al.Study on Calculation Method of Larger Unbalanced Earth Pressure of Backfill behind Abutment in Integral Abutment Jointless Bridges[J].Journal of Zhengzhou University (Engineering Science),2022,43(02):84-90.[doi:10.13705/j.issn.1671-6833.2022.02.012]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
43卷
Number of periods:
2022 02
Page number:
84-90
Column:
Public date:
2022-02-27
- Title:
- Study on Calculation Method of Larger Unbalanced Earth Pressure of Backfill behind Abutment in Integral Abutment Jointless Bridges
- Keywords:
- bridge engineering; integral abutment jointless bridges; pseudo-static test; larger unbalanced earth pressure of backfill behind abutment; soil-abutment-steel H-pile
- CLC:
- TU473
- DOI:
- 10.13705/j.issn.1671-6833.2022.02.012
- Abstract:
- In order to study the variation of larger unbalanced earth pressure of backfill behind abutment caused by vehicle load, several reciprocating low-cycle pseudo-static tests on interaction of soil-abutment-steel H-pile with or without considering the effect of unbalanced earth pressure of backfill behind abutment were carried out. A comparative study was performed to find magnitude, distribution law and calculation method of larger unbalanced earth pressure of backfill behind abutment. The test results indicated that under the test conditions of this study, with the increase of displacement load, the distribution law of earth pressure for the abutment-steel H-pile interaction under backfill behind abutment (AHP model)changed from “triangle“distribution to “trapezoidal” distribution. The distribution law of earth pressure for the abutment-steel H-pile interaction under larger unbalanced earth pressure of backfill behind abutment (LAHP model) was a "trapezoidal" distribution. The earth pressure coefficient for LAHP model was larger than that of AHP model under the reciprocating displacement loading. The existing calculation method of earth pressure coefficient K was not applicable to IAJBs. The earth pressure coefficient of AHP and LAHP models were 12.34 and 16.16 respectively. They were significantly larger than active earth pressure coefficient (Kac=0.24) and earth pressure coefficient at rest (K0=0.43) from the code of General Specifications for Design of Highway Bridges and Culverts (JTG D60—2015) as well as the Coulomb theory(KpC=9.96) when δ/h reached 0.016 (δ/h=0.016). In addition, the existing calculation method of earth pressure coefficient K was also larger than the existing theoretical calculation methods(the Rankine theory KPR=3.69). In addition, the relevant research in this study could provide reference for the design and calculation and the formulation of relevant specifications in IAJBs
- References:
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Last Update:
2022-02-25