土工基础

土工基础 ›› 2019, Vol. 33 ›› Issue (6): 679-682.

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单锚点预应力锚索抗滑桩加固边坡设置位置的优化研究

以晋西北黄土丘陵区的某非均质层状三级边坡为例，基于强度折减法，运用有限元软件PLAXIS进行计算分析，结果表明该边坡处于基本稳定状态，需加固，拟采用单锚点预应力锚索抗滑桩对其进行加固。结合边坡各计算工况的安全系数、塑性区范围以及抗滑桩最大内力（弯矩和剪力）与位移三方面，分析了单锚点预应力锚索抗滑桩加固该边坡时桩位及锚索锚固位置变化对该边坡稳定性的影响。计算结果表明：当抗滑桩位于中级边坡坡顶，锚索锚固在距桩顶4.0 m处时较合适，该结论可供其他类似黄土边坡的设计与加固参考。   

  1. 〗（吕梁学院 建筑系，山西吕梁〓033000）
  • 收稿日期:2019-08-08 修回日期:2019-08-16 出版日期:2019-12-28 发布日期:2019-12-28
  • 作者简介:侯文萃（1984-），女，助教，硕士，研究方向为岩土工程。

The Location Optimal Study of Slope Reinforced by Prestressed Ground Anchors

The stability of a non-homogeneous three-tier slope in rolling hill loess region in northwest Shaanxi was numerically evaluated through finite element software PLAXIS using strength reduction method. The analytical results indicated the slope stability mitigations are required. The single layer prestressed ground anchor caisson system was selected for the slope stabilization work. Under various loading combinations, the factor of safety, limits of plastic soil zone, the maximum bending moment deflections in the caisson were evaluated and the effect of anchoring location on the slope stability was also investigated. The results indicated that, when the caisson is located at the top of middle tier slope, the most appropriate position applying the ground anchor was 0.4 meters below the top of caisson.   

  1. (Department of Architecture, Lvliang University, Lvliang 033000)
  • Received:2019-08-08 Revised:2019-08-16 Online:2019-12-28 Published:2019-12-28

摘要： 以晋西北黄土丘陵区的某非均质层状三级边坡为例，基于强度折减法，运用有限元软件PLAXIS进行计算分析，结果表明该边坡处于基本稳定状态，需加固，拟采用单锚点预应力锚索抗滑桩对其进行加固。结合边坡各计算工况的安全系数、塑性区范围以及抗滑桩最大内力（弯矩和剪力）与位移三方面，分析了单锚点预应力锚索抗滑桩加固该边坡时桩位及锚索锚固位置变化对该边坡稳定性的影响。计算结果表明：当抗滑桩位于中级边坡坡顶，锚索锚固在距桩顶4.0 m处时较合适，该结论可供其他类似黄土边坡的设计与加固参考。

关键词: 非均质三级边坡, 单锚点预应力锚索抗滑桩, 桩位, 锚索锚固位置, 边坡稳定性

Abstract:

The stability of a non-homogeneous three-tier slope in rolling hill loess region in northwest Shaanxi was numerically evaluated through finite element software PLAXIS using strength reduction method. The analytical results indicated the slope stability mitigations are required. The single layer prestressed ground anchor caisson system was selected for the slope stabilization work. Under various loading combinations, the factor of safety, limits of plastic soil zone, the maximum bending moment deflections in the caisson were evaluated and the effect of anchoring location on the slope stability was also investigated. The results indicated that, when the caisson is located at the top of middle tier slope, the most appropriate position applying the ground anchor was 0.4 meters below the top of caisson.

Key words: Non-homogeneous Three-Tier Slopes, Single Layer Anchored Prestressed Anti-Sliding Caisson, Caisson Alignment, Ground Anchor Position, Slope Stability

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