Centrifugal model test on differential settlement control of widened pile foundation of old bridge in reconstruction and extension of expressway(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2022年2期
- Page:
- 1-9
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Centrifugal model test on differential settlement control of widened pile foundation of old bridge in reconstruction and extension of expressway
- Author(s):
- FENG Zhongju; CHEN Jinhua; LIU Xingyue; WANG Fuchun; XU Hao
- School of Highway, Changan University, Xian 710064, Shaanxi, China
- Keywords:
- road engineering; differential settlement; centrifugal model test; old bridge widening; sensitivity analysis; control parameter
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to solve the problem of differential settlement of new and old pile foundation in the widening project of old bridge of expressway reconstruction and expansion project, relying on the widening project of Beiheya Bridge, through indoor centrifugal model test, the bearing characteristics of new piles with different pile lengths, diameters, and the variation law of differential settlement between new and old piles were studied respectively, and then combined with the sensitivity analysis method, the reasonable increment range of new pile length and pile diameter of Beiheya Bridge was obtained. The differential settlement control technology of widening pile foundation of old bridge in expressway reconstruction and expansion was put forward. The results show that the pile foundation construction of the new bridge will obviously reduce the bearing capacity of the old pile, the settlement of the new pile was 15.4% higher than that of the old pile, and the settlement of the old pile was 11.2% higher than that of the single pile when the length of the new pile increases by 3, 5, 7 and 10 m, the differential settlement decreases by 24.5%, 37.4%, 45.7% and 53.8%, respectively. When the diameter of new pile increases by 0.3, 0.5, 0.7 and 1.0 m, the differential settlement decreases by 24.7%, 36.3%, 44.1% and 50.4%, respectively, but when the pile length and pile diameter continue to increase, the control effect of differential settlement will tend to be stable. The reasonable increment range of the length and diameter of the new pile is 3 to 7 m and 0.3 to 0.7 m, respectively. The new pile adopts the scheme of pile length 15 m, pile diameter 1.8 m or pile length 18 m and pile diameter 1.5 m, which can better control the differential settlement of new and old pile foundations. The research methods and results can provide reference for similar projects. 5 tabs, 11 figs, 35 refs.
Last Update: 2022-04-13