双排桩隔离位移场防护邻近基坑高楼监测研究

李东海; 王梦恕; 杨广武; 刘军; 张顶立

doi:10.11779/CJGE2014S2072

双排桩隔离位移场防护邻近基坑高楼监测研究 English Version

李东海^{1, 2},
王梦恕¹,
杨广武³,
刘军⁴,
张顶立¹

1. 北京交通大学隧道及地下工程教育部工程研究中心,北京 100044;
2. 北京市市政工程研究院,北京 100037;
3. 北京市重大项目建设指挥部办公室,北京 100029;
4. 北京建筑工程学院,北京 100044

详细信息

作者简介:
李东海(1977- ),男,博士,高级工程师,主要从事隧道及地下工程研究与监测工作。E-mail: sidenli2000@163.com。

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出版历程
- 收稿日期: 2014-07-27
- 发布日期: 2014-07-27

Monitoring of double-row piles and high buildings adjacent to deep foundation pits

1. Tunnel and Underground Engineering Research Center of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2. Beijing Municipal Engineering Research Institute, Beijing 100037, China;
3. Beijing major Projects Construction Headquarters Office, Beijing 100029, China;
4. Beijing University of Civil Engineering and Architecture, Beijing 100044, China

摘要

摘要: 邻近基坑的既有建筑物由于基坑开挖引起的土体位移作用而产生附加变形甚至造成严重损伤。双排桩作为一种刚度较大的隔离措施成为当前的研究热点。以北京某地铁深基坑邻近高层居民楼为实例,对双排桩的桩排距、冠梁连接、桩间土处理等关键设计参数进行了有针对性的优化。采用数值模拟计算和现场监测,对双排桩、桩后土体及高层建筑等组成的位移场进行了分析,并进一步总结了双排桩、桩后土体及高层建筑的变形规律。同时,通过双排桩与单排桩的变形对比分析,验证了双排桩对位移场的隔离效果明显,围护结构背后土体的水平位移由17 mm降低到8 mm,减少了53%。有效控制了既有建筑的损伤程度,居民楼的最终最大差异沉降为6.9 mm,角变量为0.33‰,确保了邻近基坑居民楼的使用安全。为后续类似工程提供了有益的参考。
- 深基坑 /
- 双排桩 /
- 位移场 /
- 既有建筑 /
- 监测
Abstract: The existing buildings adjacent to a deep foundation pit will be damaged seriously or additionally deformed when the foundation pit is excavated, and it will lead to motion of soils. The double-row piles as one of shielding measures are studied. Based on a deep foundation pit adjacent to high buildings in Beijing, the key design parameters of double-row piles such as distance of row piles, distance of piles, link of top beam, and strength of soils between the piles are analyzed. Through the numerical simulation and in-situ monitoring, the displacement field grouped by the double-row piles, soils after the piles and high buildings is analyzed. The deformation laws of the double-row piles, soils after the piles and high buildings are concluded. At the same time, it is proved that the double-row piles can reduce the displacement field obviously by comparing the double-row piles to the single-row ones. The horizontal displacement of soils after the piles decreases from 17 mm to 8 mm, with a percent of about 53%. The maximum differential settlement of high buildings is 6.9 mm and the angle variance is 0.33‰. In a word, the safety of buildings is ensured by monitoring during the excavation of the deep foundation pit. It may be useful reference to the similar engineering in future.
- deep foundation pit /
- double-row pile /
- displacement field /
- existing building /
- monitoring

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参考文献(16)

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