预应力锚索在加固重力式挡墙中的应用研究.pdf

第40卷,第1期
公路工程
Vol 40. No
2015年2月
Highway Engineeri
Feb.,2015
预应力锚索在加固重力式挡墙中的应用研究
孟云伟2
(1.同济大学道路与交通工程教育部重点突验室,上海201804;2.招商局重庆交通科研设计院有限公司,重
庆400067)
[摘要]预应力错索技术已在新建公路边坡开挖时得到了广泛应用,但在加固支挡结构且要同时保证其上
方交通不中断条件下的应用研究极少见诸报道。以某互通匝道重力式挡墙加固工程为例,详细闻明了预应力備索
对重力式挡墙的加固机理,分析了挡墙的破坏模式,合理确定了锚索错头的水平向、竖向间距,从而既保证错固段
端部不出现贯通的塑性区,又使索对挡墙的锚固力平均分布于挡墙体,能遏制挡墙的基底滑移和墙面开裂。采
用了套管施工工艺,保证在预应力锚索成孔穿越墙背回填土层时,土层不塌陷,不影响成孔,进而确保墙顶车辆的
正常通行。工程实例分析表明,该方法可靠,可据此对类似条件下的加固工程进行计算分析,尤其为加固工程的快
速施工、保证通行的技术决策提供了一种切实有效的途径。
[关键词]预应力铺索;加机理;挡土墙
[中图分类号]U417.1
[文献标识码]A
文章编号]1674-0610(2015)01-0118-03
The Application Study of Prestress Anchor for Retaining Wall
Reinforcement Engineering
MENG Yunwei
(1. The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongii University
Shanghai, 201804, China; 2. China Merchants Chongqing Communications Research &Design Institu-
te Co, Ltd. Chongqing, 400067, China)
I Abstract] The application technique of prestressed anchor is widely applied to slope excavation in
the highway engineering. While the study of prestressed anchor for reinforcing existing retaining engineer-
ing structures and ensuring uninterrupted traffic flow on top of the retaining structures has been reported
rarely for recent years. Taking gravity retaining wall reinforcement project in a ramp of an expressway for
example, the mechanism of reinforcement of prestressed anchor in the wall is introduced in detail. The
failure mode of retaining wall is analyzed. The horizontal and vertical distance of anchor head are deter
mined reasonably. This can not only ensure the plastic zone scope of anchoring section end discontinu
ous, but also can make the anchoring force of prestressed anchor to retaining wall body evenly distribu
ted. The basic sliding and surface cracking of retaining wall have been effectively avoided. The construc
tion technology of cast-in-place is used in the reinforcement project. The advantage of this technology in
clude preventing the borehole from collapsing of wall back filling and speeding up the construction sched
ule while the prestressed anchor pass through the filling. Therefore, the construction of holes forming will
cause any inconvenience to the top of retaining wall. And then the normal thoroughfare for vehicles is not
been affected. The analysis of engineering example indicates: it is reliable to reinforcing gravity retaining
wall and can be used for similar project while calculating and analysis. This method also supplies a prac
tical way for decision-making of rapid construction and ensuring vehicle traffic in reinforcement project
[收稿日期]2013~12-23
基金项目]重庆交通大学交通土建T程材料国家地方联合T程实验室、山区道路结构与材料重庆市市级重点实验室、山区道路建设与维
护技术重庆市高校重点实验室开放基金资助( LHSYS-2013-007)
[作者简介]孟云伟(1980-),男,河北赵县人,同济大学在读博士研究生,国家注册土木(岩土)T程师,高级T程师,主要从事道路、岩土
T程的科研「作。