[1]冯忠居,陈锦华,刘星越,等.高速公路改扩建旧桥加宽桩基础差异沉降控制离心模型试验[J].长安大学学报(自然科学版),2022,42(2):1-9.
 FENG Zhong ju,CHEN Jin hua,LIU Xing yue,et al.Centrifugal model test on differential settlement control of widened pile foundation of old bridge in reconstruction and extension of expressway[J].Journal of Chang’an University (Natural Science Edition),2022,42(2):1-9.
点击复制

高速公路改扩建旧桥加宽桩基础差异沉降控制离心模型试验()
分享到:

长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

卷:
第42卷
期数:
2022年2期
页码:
1-9
栏目:
道路工程
出版日期:
2022-03-15

文章信息/Info

Title:
Centrifugal model test on differential settlement control of widened pile foundation of old bridge in reconstruction and extension of expressway
作者:
冯忠居陈锦华刘星越王富春徐浩
长安大学 公路学院,陕西 西安 710064
Author(s):
FENG Zhongju CHEN Jinhua LIU Xingyue WANG Fuchun XU Hao
School of Highway, Changan University, Xian 710064, Shaanxi, China
关键词:
道路工程差异沉降离心模型试验旧桥加宽敏感性分析控制参数
Keywords:
road engineering differential settlement centrifugal model test old bridge widening sensitivity analysis control parameter
文献标志码:
A
摘要:
为解决高速公路改扩建工程旧桥加宽中新旧桩基的差异沉降问题,依托北河崖大桥加宽工程,通过室内离心模型试验,分别研究了新桩不同桩长、不同桩径下单桩承载特性和新旧桩基差异沉降变化规律,并结合敏感性分析方法,得出北河崖大桥新桩桩长、桩径合理增量范围,提出了高速公路改扩建旧桥加宽桩基础差异沉降控制技术参数。结果表明:新桥桩基施工会明显降低旧桩承载力;新桩沉降量比旧桩沉降量高15.4 %,新旧桩共同作用时,旧桩沉降量比单桩沉降量高11.2%;当新桩桩长增加3、5、7、10 m时,差异沉降减幅分别为24.5%、37.4%、45.7%、53.8%;当新桩桩径增大0.3、0.5、0.7、1.0 m时,差异沉降减幅分别为24.7%、36.3%、44.1%、50.4%,但当桩长、桩径继续增大后,差异沉降控制效果将趋于稳定;新桩桩长、桩径合理增量范围分别为3~7 m和0.3~0.7 m;新桩采用桩长15 m、桩径1.8 m或桩长18 m、桩径1.5 m方案,可较好控制新旧桩基差异沉降,研究方法和结果可为类似工程提供参考。
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.

相似文献/References:

[1]武建民,祝伟,马士让,等.应用加权密切值法评价基质沥青抗老化性能[J].长安大学学报(自然科学版),2012,32(01):0.
[2]张宜洛,袁中山.SMA混合料结构参数的影响因素[J].长安大学学报(自然科学版),2012,32(01):0.
[3]陈璟,袁万杰,郝培文,等.微观指标对沥青热稳定性能的影响[J].长安大学学报(自然科学版),2012,32(01):0.
[4]周兴业,刘小滔,王旭东,等.基于轴载谱的沥青路面累计当量轴次换算[J].长安大学学报(自然科学版),2012,32(01):0.
[5]李祖仲,王伯禹,陈拴发,等.轴载对复合式路面应力吸收层荷载应力的影响[J].长安大学学报(自然科学版),2012,32(01):0.
[6]关博文,刘开平,陈拴发,等.水镁石纤维路面混凝土路用性能[J].长安大学学报(自然科学版),2012,32(01):0.
[7]翁效林,王玮,张留俊,等.拓宽路基荷载下管桩复合地基沉降变形模式[J].长安大学学报(自然科学版),2012,32(01):0.
[8]穆柯,王选仓,柳志军,等.基于非饱和渗流原理的路基含水率预估[J].长安大学学报(自然科学版),2012,32(01):0.
[9]李振霞,陈渊召.不同类型半刚性基层材料性能的试验与分析[J].长安大学学报(自然科学版),2012,32(01):0.
[10]马 骉,马 晋,周宇鹏.沥青混合料降温收缩断裂特性[J].长安大学学报(自然科学版),2012,32(03):1.
 MA Biao,MA Jin,ZHOU Yu-peng.Cooling shrinkage fracture characteristic of asphalt mixture[J].Journal of Chang’an University (Natural Science Edition),2012,32(2):1.
[11]傅珍,王选仓,陈星光,等.高速公路拓宽差异沉降对路面结构的影响[J].长安大学学报(自然科学版),2008,28(03):36.
 FU Zhen,WANG Xuan-cang,CHEN Xing-guang,et al.Influence of differential settlement on pavement structure in expressway widening project[J].Journal of Chang’an University (Natural Science Edition),2008,28(2):36.
[12]傅珍,王选仓,陈星光,等.拓宽道路工后差异沉降控制标准[J].长安大学学报(自然科学版),2008,28(05):10.
 FU Zhen,WANG Xuan-cang,CHEN Xing-guang,et al.Controlling criterion of differential settlements after widening expressway[J].Journal of Chang’an University (Natural Science Edition),2008,28(2):10.
[13]李又云,刘保健,谢永利,等.饱和软土地基固结沉降的现场测试[J].长安大学学报(自然科学版),2006,26(06):1.
 LI You-yun,LIU Bao-jian,XIE Yong-li.Spot test of consolidation settlement of soft clay foundation[J].Journal of Chang’an University (Natural Science Edition),2006,26(2):1.
[14]翁效林,高建华,宋文佳,等. 基于拓宽路面附加变形的地基差异沉降控制标准[J].长安大学学报(自然科学版),2013,33(05):26.

更新日期/Last Update: 2022-04-13