摘要
近年来,随着城市建设的发展,国内高层建筑增多,地下空间被充分利用,深基坑工程也与日俱增。尤其近十年,各地涌现了不少开挖深度超过20m的基坑。然而,深基坑开挖引发的工程事故也随之而来——城市中大量土体的移动可能导致邻近建筑物发生倾斜或开裂、道路损坏、管线断裂,危及城市桥梁生命线工程的安全。因此,深基坑开挖引起的周围地表变形问题逐渐受到人们的重视。
为了了解既有桥梁在深基坑开挖过程中的位移情况,评定深基坑开挖后对桥梁安全性的影响,并为解决此类问题提供科学依据,笔者对成都火车南站人南立交E匝道桥梁受凯德商用项目深基坑开挖的影响进行了分析、监测,主要完成了以下方面的工作。
(1)综述桥梁在深基坑开挖影响下的安全性评估方法,在明确理论分析方法的基础上,对凯德商用项目深基坑开挖过程进行模拟分析,初步评定基坑的开挖对成都火车南站人南立交E匝道的影响；
(2)对E匝道在凯德商用项目深基坑开挖过程中桥梁主墩、桩基、桥面系和基坑护壁桩建立安全监控体系,并运用施工安全监测体系,定期进行信息采集,处理与分析,并得出监测结论；
(3)采用大型桥梁有限元软件MIDAS/CIVIL对E匝道桥进行计算分析,评定基坑开挖后桥梁的安全性能。
In the recent years, with the development of urban construction, more high-rise building has been built and the underground space has been utilized fully, bringing more deep excavation engineering. Especially in recent10years, a lot of foundation pit that deeper than20m has been dug. However, it has also brought many engineering accidents———the movement of a great deal of soil in urban could made buildings nearby incline or crack、 damage of the road and pipeline fracture,threatening the safety of city bridge engineering. Therefore, the problem of ground deformation brought by the digging of deep foundation pit has been paid more attention to.
In order to know the displacement caused by the digging of deep foundation pit and assess the safety influence that brought by it, and also to find the scientific basis to solve these problems, we analyze and monitor Chengdu south railway station Rennan overpass E-ramp influenced by capitaland commercial project deep foundation pit, including follow jobs:
(1) Summarize the safety assess method of the bridge influenced by the digging of deep foundation pit. On the basis of theoretical analysis method, we make imitative analysis on the process of the digging of deep foundation pit, and assess the influence initially;
(2) Set up safety supervision system for E-ramp on bridge main piers、pile foundation、 floor system、wall protection piles of foundation pit by using construction safety monitoring system and collecting information regularly. Then, we analyze and process data to draw a conclusion:
(3) By using large bridge finite element software MIDAS/CIVIL, we calculate and analyze E-ramp. assess the performance of the whole bridge after digging the deep foundation pit.
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