地震作用下微型桩群桩支护黄土滑坡的土-桩动力响应分析  

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

作　　者：解庆禹 黄强兵[1] 孙玉军 马宗源 周恒[4] 孟凡东 郭治宇 余岱金 XIE Qingyu;HUANG Qiangbing;SUN Yujun;MA Zongyuan;ZHOU Heng;MENG Fandong;GUO Zhiyu;YU Daijin(College of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,China;State Power Investment Corporation,Yellow River Upper Reaches Hydropower Development Co.,Ltd.,Xining 810001,China;Guizhou Communications Polytechnic,Guiyang 551400,China;Powerchina Northwest Engineering Co.,Ltd.,Xi’an 710065,China)

机构地区：[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

出　　处：《西北大学学报（自然科学版）》2024年第1期111-118,共8页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金(42041006);长安大学研究生科研创新实践项目(300103723047)。

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。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 

分 类 号：P642.22[天文地球—工程地质学]