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Modeling time-dependent behavior of geogrids and its application to geosynthetically reinforced walls.

机译：对土工格栅随时间变化的行为建模及其在土工合成材料加筋墙中的应用。

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摘要

The purpose of the present study was: (1) To develop a realistic constitutive model for Geogrid reinforcement that accounts for general time-dependent response, and (2) To gain insight into the time-dependent behavior of geosynthetically reinforced soil walls primarily under non-failure conditions.; Based on the results of high quality experiments, and having investigated the validity of the isochrone concept, the first objective was realized. The constitutive model developed is limited to non-failure load levels and to geosynthetics for which relaxation values obtained from creep isochrones are in good agreement with experimentally measured values.; The second objective was realized by mathematically modeling a laboratory-instrumented wall with cohesive backfill and then performing numerical parametric studies of the wall. In each of these studies the number of assumptions associated with the modeling process was minimized. In all cases, the soil-wall-reinforcement system was treated as a boundary value problem and analyzed using the finite element method.; The results of these analyses indicated that: (1) Failure to include the time-dependent response of the backfill soil may significantly underestimate displacements in the soil mass and strains and stress in the reinforcement. (2) Use of a time-independent, quasi-linear elastic (“hyperbolic”) material idealization overestimates displacements in the soil mass and strains and stress in the reinforcement. (3) During sustained loading 1000 hours in duration, the deformation of the backfill soil and timber facing rather quickly became negligible, as the viscoplastic strain rate went to zero. Consequently, the reinforcement was essentially in a state of relaxation. The practical ramifications of this finding are a possible decrease in creep reduction factors associated with typical design procedures involving geosynthetically reinforced soil structures.
机译：本研究的目的是：（1）为土工格栅建立一个逼真的本构模型，该模型考虑了一般的时效响应，以及（2）主要了解在非荷载作用下土工合成材料土墙的时效行为-故障条件。基于高质量实验的结果，并研究了等时线概念的有效性，从而实现了第一个目标。建立的本构模型仅限于非破坏载荷水平和土工合成材料，其蠕变等时线获得的弛豫值与实验测量值高度吻合。第二个目标是通过对具有粘性回填的实验室仪器墙进行数学建模，然后对墙进行数值参数研究来实现的。在每项研究中，与建模过程相关的假设数量都被最小化。在所有情况下，都将土墙加筋系统视为边值问题，并使用有限元方法进行分析。这些分析的结果表明：（1）如果未能包括回填土的时变响应，可能会大大低估了土体的位移，钢筋的应变和应力。 （2）使用与时间无关的准线性弹性（“双曲线”）材料理想化会高估土壤中的位移以及钢筋中的应变和应力。 （3）在持续荷载1000小时的过程中，由于粘塑性应变率降至零，回填土和木材饰面的变形很快就可以忽略不计。因此，加强件基本上处于松弛状态。这一发现的实际后果是与涉及土工合成材料的土壤结构的典型设计程序相关的蠕变减小因子可能降低。

著录项

  • 作者

    Dechasakulsom, Montri.;

  • 作者单位

    University of Delaware.;

  • 授予单位 University of Delaware.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 397 p.
  • 总页数 397
  • 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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