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谢雄耀, 冉光斌, 宁张伟, 洪建忠. 内支撑基坑开挖对近间距下立交道路影响离心机试验[J]. 岩土工程学报, 2010, 32(7).
引用本文: 谢雄耀, 冉光斌, 宁张伟, 洪建忠. 内支撑基坑开挖对近间距下立交道路影响离心机试验[J]. 岩土工程学报, 2010, 32(7).
Centrifuge modeling of effect of excavation on adjacent underpasses of deep foundation pits with shorings[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(7).
Citation: Centrifuge modeling of effect of excavation on adjacent underpasses of deep foundation pits with shorings[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(7).

内支撑基坑开挖对近间距下立交道路影响离心机试验

Centrifuge modeling of effect of excavation on adjacent underpasses of deep foundation pits with shorings

  • 摘要: 首先,以同济TLJ-150复合土工离心机为平台,开发研制了基于液压自动控制的内支撑基坑全过程施工模拟开挖系统,通过分时排放规定高度的代土液体来模拟土体分层开挖,并通过支撑杆锁定装置模拟对挡土墙进行适时支撑,实现了在高速运转的离心机上对具有多道支撑的深基坑进行不停机状态的动态开挖模拟。其次,以上海地铁九号线源深路风井32.7 m深基坑开挖对相邻仅3 m的杨高路下立交道路影响为工程背景,具体介绍了离心机试验过程。通过与现场监测数据的对比,结果表明所开发的自动开挖系统能较好地模拟深基坑开挖过程。最后,通过基坑周边不同加固方案对相邻下立交道路保护的离心机试验结果分析,认为设置搅拌桩隔墙是减少下立交变形的有效手段,搅拌桩隔离墙对基坑开挖引起的土体位移具有遮拦效应。为了有效发挥保护作用,隔离墙深度应大于基坑开挖深度;但是,隔离墙的遮拦作用,在沿平行下立交纵向布置超过距基坑挡土墙边0.5倍开挖深度范围之外后,与没有隔离墙相比效果不明显,这个范围可以作为隔离墙纵向布置的边界值。

     

    Abstract: First, a new automatic oil-controlling system for real-time modeling of the excavation of the deep foundation pit with shorings is presented, which can be installed in the 150-ton multi-function centrifuge in the Centrifuge Laboratory of Tongji University, China. Based on the automatic system, the excavation of different layers of soils is simulated by discharging different volumes of special liquid, and the installation of the shorings on a retaining wall after excavating the above soils timely is simulated by locking the shoring of the system. Accordingly, the construction of a deep foundation pit with shorings can be modeled at high-speed flight operations of the centrifuge. Second, the centrifuge modeling of the effect on the adjacent 3 m underpass induced by excavating 32.7 m-deep Yanggao air well of Metro line 9 of Shanghai is introduced. The comparison between the observed data and the modeling data shows that the automatic excavating system of the centrifuge can effectively model a complete excavation with shorings. Finally, the results of the settlement of the underpass by different mixture-pile barrier walls for improving soil between the excavation and the underpass are compared. It is concluded that the barrier walls can effectively decrease the settlement of the adjacent underpass. The barrier wall should be deeper than the excavation depth in order to make an effective barrier, and the length limit of the barrier walls should be the half depth of excavation beyond the excavation zone.

     

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