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首页> 外文学位 >Liquefaction analysis of level and sloping ground using field case histories and penetration resistance.
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Liquefaction analysis of level and sloping ground using field case histories and penetration resistance.

机译：利用现场案例历史和渗透阻力对液位和坡地进行液化分析。

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摘要

The objective of this study was to develop simple, empirical methods to evaluate liquefaction problems in level and sloping ground. Specifically, these methods include: (1) CPT-based level ground liquefaction resistance relationships for sandy soils; (2) SPT- and CPT-based relationships to estimate yield shear strength available at the triggering of liquefaction in sloping ground (i.e, ground subjected to a static shear stress); (3) SPT- and CPT-based relationships to estimate liquefied shear strength available at large deformation following liquefaction triggering; and (4) A liquefaction analysis procedure for sloping ground that addresses liquefaction susceptibility, liquefaction triggering, and post-triggering stability.; The author collected 172 level ground liquefaction and non-liquefaction case histories where CPTs were performed. These cases were separated into those involving clean sands (less than 5% fines content), silty sands (between 5 and 35% fines content), and silty sands to sandy silts (greater than 35% fines content) to develop three separate liquefaction resistance relationships. These relationships also use median grain size (D50) to classify the cases.; The author collected 33 case histories of liquefaction flow failure where SPT and/or CPT results are available or can be reasonably estimated. These cases were back-analyzed to evaluate the yield shear strength and strength ratio mobilized at liquefaction triggering. Relationships between yield strength ratio and corrected SPT and CPT resistance were developed for use in liquefaction triggering analysis. The flow failures also were backanalyzed to evaluate the liquefied shear strength and strength ratio mobilized at large deformation. For cases with sufficient information, the back-analysis incorporated the kinetics of failure. Relationships between liquefied strength ratio and corrected SPT and CPT resistance were developed for use in post-triggering stability analysis.; Lastly, the author proposed a comprehensive liquefaction analysis procedure for sandy soils to evaluate liquefaction susceptibility, liquefaction triggering, and post-triggering stability. The procedure incorporates the proposed relationships to estimate yield and liquefied strength ratio, and does not require a suite of laboratory tests or corrections for sloping ground and vertical effective stress. The procedure is verified initially using the Lower San Fernando Dam case history.
机译：这项研究的目的是开发一种简单的经验方法来评估水平和倾斜地面上的液化问题。具体来说，这些方法包括：（1）基于CPT的砂土水平液化阻力关系; （2）基于SPT和CPT的关系来估计在倾斜地面（即承受静态剪应力的地面）液化触发时可用的屈服剪切强度; （3）基于SPT和CPT的关系来估计液化触发后大变形时可用的液化剪切强度; （4）针对斜坡的液化分析程序，解决液化敏感性，液化触发和触发后稳定性问题。作者收集了执行CPT的172级地面液化和非液化案例历史。这些案例被分为涉及清洁砂（粉尘含量低于5％），粉砂（粉尘含量介于5和35％之间）和粉砂至沙质粉尘（粉含量高于35％）的案例，以形成三个独立的抗液化性关系。这些关系还使用中值晶粒尺寸（D 50 ）对病例进行分类。作者收集了33例液化流失的案例历史，这些案例中有SPT和/或CPT结果可用或可以合理估计。对这些案例进行了后分析，以评估在液化触发时动员的屈服剪切强度和强度比。开发了屈服强度比与校正后的SPT和CPT电阻之间的关系，用于液化触发分析。还对流动失败进行了反分析，以评估在大变形下液化的剪切强度和动员的强度比。对于具有足够信息的情况，反向分析包括了故障的动力学。开发了液化强度比与校正后的SPT和CPT电阻之间的关系，以用于触发后的稳定性分析。最后，作者提出了一种用于砂土的综合液化分析程序，以评估液化敏感性，液化触发和触发后稳定性。该程序结合了提议的关系来估计屈服和液化强度比，并且不需要针对倾斜地面和垂直有效应力的一套实验室测试或校正。最初使用下圣费尔南多大坝案例历史验证了该过程。

著录项

  • 作者

    Olson, Scott Michael.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 547 p.
  • 总页数 547
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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