摘要
以长春某穿越跨河桥盾构工程为例,分析考虑渗流及不考虑渗流作用2种工况下,跨河桥及其邻域土体的变形特性。研究结果表明:地铁盾构隧道穿越跨河桥施工过程中,考虑应力—渗流耦合作用是必要且合理的,考虑流固耦合影响时的地表最大沉降量、跨河桥的竖向位移及桩身水平位移均明显大于不考虑流固耦合影响。地铁盾构隧道穿越跨河桥施工过程中,盾构隧道左线施工诱发的跨河桥竖向位移及桩身水平位移量占总变形量的60%,右线施工诱发的跨河桥竖向位移及桩身水平位移量占总变形量的40%。地铁盾构隧道穿越跨河桥施工过程中,不考虑应力—渗流耦合作用时,桩身水平位移曲线呈直线型;考虑应力—渗流耦合作用时,桩身水平位移曲线存在一明显拐点,位于河床所在位置。
Taking a river-crossing shield project in Changchun as an example,this paper studies the deformation characteristics of the river-crossing bridge and its adjacent soil,considering seepage and without considering seepage.The results show that it is necessary and reasonable to consider the stress-seepage coupling effect in the construction process of subway shield tunnel crossing the river bridge.The maximum ground settlement,the vertical displacement of the river bridge and the horizontal displacement of the pile body are significantly greater than those without considering the fluid-solid coupling effect.During the construction of metro shield tunnel crossing river-crossing bridge,the vertical displacement of river-crossing bridge and horizontal displacement of pile induced by left line construction of shield tunnel account for about 60%of the total deformation,and the vertical displacement of river-crossing bridge and horizontal displacement of pile induced by right line construction account for about 40%of the total deformation.During the construction of subway shield tunnel crossing river bridge,the horizontal displacement curve of pile body is linear without considering the stress-seepage coupling effect.When considering the stress-seepage coupling effect,there is an obvious inflection point in the horizontal displacement curve of pile body,which is located in the riverbed.
作者
马静
Ma Jing(Beijing Municipal Administration Professional Design Institute Co.,Ltd.,Beijing 100037,China)
出处
《青海交通科技》
2023年第1期129-135,共7页
Qinghai Transportation Science and Technology
关键词
岩土工程
盾构隧道
跨河桥
数值模拟
变形
geotechnical engineering
shield tunnel
cross-river bridge
numerical simulation
deformation
