Analysis of dynamic soil-pile response inmicropile group supporting loess landslide under earthquake action

XIE Qingyu; HUANG Qiangbing; SUN Yujun; MA Zongyuan; ZHOU Heng; MENG Fandong; GUO Zhiyu; YU Daijin

doi:10.16152/j.cnki.xdxbzr.2024-01-013

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Analysis of dynamic soil-pile response inmicropile group supporting loess landslide under earthquake action

Engineering Geological Disasters | 更新时间：2024-01-18

- Analysis of dynamic soil-pile response inmicropile group supporting loess landslide under earthquake action
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 1, Pages: 111-118(2024)
- 作者机构：
  
  1.长安大学　地质工程与测绘学院，陕西　西安　710054
  2.国家电投集团黄河上游水电开发有限责任公司，青海　西宁　810001
  3.贵州交通职业技术学院，贵州　贵阳　551400
  4.中国电建集团西北勘测设计研究院有限公司，陕西　西安　710065
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2024-01-013
  CLC：
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XIE Qingyu, HUANG Qiangbing, SUN Yujun, et al. Analysis of dynamic soil-pile response inmicropile group supporting loess landslide under earthquake action. [J]. Journal of Northwest University (Natural Science Edition) 54(1):111-118(2024)
DOI：

XIE Qingyu, HUANG Qiangbing, SUN Yujun, et al. Analysis of dynamic soil-pile response inmicropile group supporting loess landslide under earthquake action. [J]. Journal of Northwest University (Natural Science Edition) 54(1):111-118(2024) DOI： 10.16152/j.cnki.xdxbzr.2024-01-013.

摘要

微型桩具有施工快速便捷和扰动小等优点，已在黄土滑坡快速治理中得到了应用。为揭示微型桩群桩支护黄土滑坡动力响应规律，该文基于动态黏弹塑性本构模型(VEP模型)，研究微型桩与滑坡地震动力相互作用机制，探讨合理桩间距。结果表明：激振后VEP模型计算结果对地震量级较敏感，模型考虑了土的黏弹塑性，能够合理的反映地震作用下坡体位移规律；地震作用下微型群桩的桩身产生弯剪组合破坏，主要破坏位置位于滑面上下2~4倍桩径处；建议微型群桩的列间距采用5~7倍桩径，排间距采用3~4倍桩径进行布设。研究结果可为地震作用下黄土滑坡防治的数值分析与抗震设计提供依据。

Abstract

The micro-pile has the advantages of fast and convenient construction and small disturbance, and has been used in the rapid treatment of loess landslide.In order to reveal the dynamic response law of loess landslide supported by micro pile, based on the dynamic visco-elasto-plastic constitutive model (VEP model), the seismic dynamic interaction mechanism between micropile and landslide is studied, and the reasonable pile spacing is discussed. The results show that the numerical calculation is close to the physical model test. The calculation results of VEP model after excitation are sensitive to the magnitude of earthquake. The model considers the visco-elastic-plasticity of soil and can reasonably reflect the displacement law of slope under earthquake. Under the action of the earthquake, the pile body of the micro-pile group produces bending shear failure, and the main failure position is located at 2~4 times the pile diameter above and below the sliding surface; it is suggested that the column spacing of micro pile group should be 5~7 times the pile diameter, and the row spacing should be 3~4 times the pile diameter.The research results can provide a basis for seismic design and numerical analysis of loess landslide prevention and control under earthquake.

关键词

微型桩数值模拟土动力特性桩间距优化滑坡地震

Keywords

micro pilenumerical simulationsoil dynamic characteristicspile spacing optimizationlandslideearthquake

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