桩锚支护上土下岩地层深基坑沉降与变形分析
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TU922

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甘肃省建设科技攻关计划项目(JK2019-01);甘肃省科技计划资助(20JR10RA570)


Settlement and Deformation Analysis of Deep Foundation Pit with Pile Anchor Support in Upper soil and lower rock strata
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    摘要:

    随着基坑开挖深度的不断加深以及地层分布的变化,建筑工程中遇到了大量的上土下岩地层深基坑。本文以特殊土岩组合地层深基坑工程为背景,对上部土层采用桩锚支护,下部岩层采用放坡开挖的组合支护稳定性进行分析,并结合监测数据对基坑变形规律进行研究。然后采用PLAXIS 3D软件建立有限元模型,计算分析不同施工阶段基坑水平、竖向变形以及锚索轴力的变化情况,并与现场监测数据进行了对比分析。该设计中采用基底按照45°+φ/2的破裂角确定支护桩嵌固点深度,有限元计算结果与监测结果吻合较好。结果表明:上土下岩地层深基坑水平位移主要发生在上部土层深度范围内,支护桩变形近似呈抛物线分布,开挖下部岩层对基坑变形影响明显减小。上部土层采用桩锚支护,下部岩层采用放坡的设计方法可起到有效控制基坑变形以及地表沉降的效果,且具有显著的经济效益。研究结果可为上土下岩地层深基坑支护结构优化设计提供一定的指导。

    Abstract:

    With the deepening of foundation pit excavation depth and the change of stratum distribution, a large number of deep foundation pits with soil and rock strata are encountered in construction engineering. In this paper, based on deep foundation pit engineering of special soil and rock combined stratum, analyzes the stability of combined support with pile anchor in the upper soil layer and slope excavation in the lower rock layer were analyzed. And combined with the monitoring data, the deformation regulation of the foundation pit was studied. Then finite element model was established by Plaxis 3D software to calculate and analyze the horizontal and vertical deformation of the foundation pit and the change of the axial force of the anchor cable in different construction stages, and the comparison and analysis were made with the field monitoring data. In this design, the depth of the embedded point of the supporting pile was determined according to the fracture Angle of 45°+φ/2. The results show that: The horizontal displacement of the deep foundation pit mainly occurs in the depth range of the upper soil layer. The deformation of the retaining pile is approximately parabolic distribution, and the influence of excavation of the lower strata on the deformation of the foundation pit reduced obviously. The design method of pile anchor support for the upper soil layer and slope lowering for the lower rock layer can effectively control the deformation of the foundation pit and the surface settlement, and it has significant economic benefits. The research results can provide some guidance for the optimization design of the retaining structure of deep foundation pit in strata of upper soil and lower rock.

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曹程明,时轶磊,龙照,等. 桩锚支护上土下岩地层深基坑沉降与变形分析[J]. 科学技术与工程, 2022, 22(10): 4120-4126.
Cao Chengming, Shi Yilei, Long Zhao, et al. Settlement and Deformation Analysis of Deep Foundation Pit with Pile Anchor Support in Upper soil and lower rock strata[J]. Science Technology and Engineering,2022,22(10):4120-4126.

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  • 收稿日期:2021-07-05
  • 最后修改日期:2022-01-25
  • 录用日期:2021-11-22
  • 在线发布日期: 2022-04-14
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