环境温度作用下半整体桥台后土抗力试验

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摘要 研究目的:半整体式桥台无伸缩缝桥(简称半整体桥)是一种新型桥梁结构形式。由于主梁与桥台刚接,在昼夜及季节性环境温度等长期作用下,主梁会使桥台沿纵桥向发生往复变位,进而引起台后土体的压力变化,产生土抗力。为研究半整体桥的台后土抗力分布规律以及中长期环境温度对土抗力的影响,开展中长期环境温度作用下半整体桥台-土相互作用拟静力试验研究。
研究结论:(1)台后土抗力随环境温度变化的规律为在第1~6中周期(约对应由春季至夏季的第一个升温区间段)内快速上升,在第6~16中周期(约对应由夏季至冬季的降温区间段)内有所减小,在第16~20中周期(约对应由冬季至春季的第二个升温区间段)又开始增加,但相比于第一个升温区间段内的增速明显减缓;(2)中长期环境温度作用下台后土抗力沿埋深方向的分布规律为先增加后减小,并在埋深0.8h处达到最大;(3)各周期内土抗力沿纵桥向的规律为在距桥台较近的区域,台后土抗力快速减小;在距桥台较远的区域,土抗力缓慢减小,并在距台背1.0h位置处土抗力基本减小至0;(4)经过一个全年大周期的环境温度作用后,台后土抗力存在明显累积增大效应,其累积效应与土体的纵桥向位置及竖向深度具有较强的相关性;(5)本研究结果可为半整体桥的设计计算以及相关规范制定提供参考。

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	黄福云
	周志明
	宋大东
	严爱国
	张峰

关键词 ：桥梁工程, 半整体桥, 拟静力试验, 季节性环境温度, 台后土抗力, 累积效应

Abstract：Research purposes:Semi-integral abutment jointless bridge (SAJB) is a new type of bridge structure. Due to the rigid connection of main girder and abutment, the main girder will induce the bridge abutment to undergo reciprocating displacement along the longitudinal bridge direction, which results the changes of soil resistance behind the abutment under the long-term effects of diurnal and seasonal ambient temperature. In order to study the distribution law of the soil resistance behind the abutment and the influence of the medium long-term ambient temperature on it, a quasi-static test of the semi-integral abutment-soil interaction was carried out under medium and long-term ambient temperature.
Research conclusions:(1) The soil resistance with the ambient temperature rises rapidly in the 1st to 6th middle period (the first warming interval from spring to summer), then decrease in the 6th to 16th middle period (the period from summer to summer). In the 16th to 20th middle period (the second warming interval from winter to spring), it starts to increase again, but the increase rate is slightly slow compared to the first warming interval. (2) The soil resistance along the buried depth increases firstly until reaching the maximum at the buried depth of 0.8h, and then decreases under the medium long-term ambient temperature. (3) The law of soil resistance along longitudinal direction in each period is that in the area near the abutment, the soil resistance decreases rapidly; while in the area far away from the abutment, the soil resistance decreases slowly to 0 at the position 1.0h away from the abutment. (4) After a large period of ambient temperature, the soil resistance behind the abutment has a significant cumulative increasing effect, and its cumulative effect has a strong correlation with the longitudinal position and vertical depth of the soil. (5) The research results can provide references for the design of semi-integral bridges and the formulation of related specifications.

Key words： bridge engineering semi-integral bridge quasi-static test seasonal ambient temperature soil resistance behind abutment cumulative effect

收稿日期: 2020-12-31

PACS:

TU443

基金资助:国家自然科学基金项目(51578161);中铁第四勘察设计院集团有限公司科技研发项目(2019K003-1)

作者简介: **黄福云,1979年出生,男,研究员。

引用本文:

黄福云, 周志明, 宋大东, 严爱国, 张峰. 环境温度作用下半整体桥台后土抗力试验[J]. 铁道工程学报, 2022, 39(1): 47-55.
HUANG Fuyun, ZHOU Zhiming, SONG Dadong, YAN Aiguo, ZHANG Feng. Experiment on the Soil Resistance behind Abutment of Semi-integral Abutment Jointless Bridge under Ambient Temperature. Journal of Railway Engineering Society, 2022, 39(1): 47-55.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I1/47

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