基于透明土技术的上覆荷载对坑外土体内部位移场影响研究
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1.中北大学环境与安全工程学院;2.山西省太原市尖草坪区学院路3号

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TV551.4+2

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国家自然科学基金(51908516)


Influence of overlying load on the internal displacement field of soil outside the pit based on transparent soil technology
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Environmental and safety engineering College,North University of China

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    摘要:

    为探究临近基坑上覆荷载对坑外土体内部变形的影响作用,采用自主设计的可控围护结构变形模式的透明土试验箱并结合粒子图像测速技术,对不同围护结构变形模式下上覆荷载对土体内部变形的影响差异进行分析。通过透明土试验所得数据与预测曲线以及工程实例进行对比,验证了试验结果的可靠性。结果表明:上覆荷载对坑外土体位移场影响显著。增大上覆荷载或减小上覆荷载与围护结构之间的距离会使坑外土体位移影响区向土层深部扩展,最大竖直沉降和水平位移也随之增大。悬臂型与内凸型坑外土体受上覆荷载压强和距离影响显著的土层深度不同。上部土体位移受悬臂型变形模式中改变上覆荷载压强与距离的影响显著,但中下部土体位移受内凸型变形模式中改变上覆荷载压强与距离的影响更为显著。相比于同比例减小上覆荷载距离,增大上覆荷载对位移影响更大。可见在实际工程中,需要结合当地建筑分布与地下工程环境,采取适当手段避免围护结构产生最不利变形模式。

    Abstract:

    In order to study the influence of overlying load on the internal deformation of soil outside the foundation pit, a transparent soil test chamber with controllable deformation mode of retaining structure was designed and combined with particle image velocimetry technology to analyze the influence of different deformation modes of retaining structure and overlying load on the internal deformation of soil. The reliability of the test results is verified by comparing the data obtained from the transparent soil test with the prediction curve and the engineering example. The results show that the overlying load has a significant effect on the displacement field of the soil outside the pit. Increasing the overlying load or reducing the distance between the overlying load and the retaining structure will make the influence area of soil displacement outside the pit expand to the deep soil layer, and the maximum vertical settlement and horizontal displacement will also increase. The soil depth of the soil outside the cantilever type and the convex type is significantly affected by the overlying load pressure and distance. The displacement of the upper soil is significantly affected by changing the pressure and distance of the overlying load in the cantilever deformation mode, but the displacement of the middle and lower soil is more significantly affected by changing the pressure and distance of the overlying load in the convex deformation mode. Compared with reducing the distance of the overlying load in the same proportion, increasing the overlying load has a greater impact on the displacement. It can be seen that in the actual project, it is necessary to combine the local building distribution with the underground engineering environment, and take appropriate measures to avoid the most unfavorable deformation mode of the retaining structure.

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张晓双,杨灏,李浩然. 基于透明土技术的上覆荷载对坑外土体内部位移场影响研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-03-25
  • 最后修改日期:2024-05-23
  • 录用日期:2024-06-05
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