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Evaluation of factors affecting earth pressures on buried box culverts.

机译：评估影响埋入式箱涵土压力的因素。

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摘要

Factors affecting the earth pressures acting on buried box culverts under deep embankments were evaluated by the field instrumentation and numerical analyses. Two instrumented cast-in-place concrete culverts were designed and constructed differently. Long term earth pressures under constant embankment height were observed after the completion of construction. Both observed earth pressures and those predicted by numerical analyses were compared with the current AASHTO earth pressure recommendations, as well as the AASHTO design pressures in effect at time a failed box culvert was designed in mid 1970s. Field measurements suggested that the previous AASHTO design pressure (1977) significantly underestimate both vertical and horizontal earth pressures, whereas the current AASHTO (1996) provide more appropriate simplified earth pressures.; Both measured and predicted earth pressures indicated that the level of compactive effort had a significant influence on the earth pressure distribution, especially the horizontal earth pressure acting on the culvert wall. A parametric finite element study suggested that the stiffness of the gravel backfill beside the culvert, which is dependent on the degree of compaction, had the greatest influence on the magnitude and distribution of earth pressure. An additional parametric study suggested that the modulus of the soil below the culvert also has a significant effect on the horizontal earth pressures.; Dynamic horizontal earth pressures induced by different construction equipment operating close to the structure were also recorded. The measurements suggested that the dynamic strain in the structure in response to the maximum transient loading (about 70 kPa) was small and had negligible effect on the culvert. High residual compaction earth pressures measured after compaction were found to decrease rapidly with time to reach a steady value under constant embankment height.; Analytical evaluation of the culvert orientation with respect to the embankment alignment suggested that the largest horizontal earth pressure acting on the culvert wall occurs when the culvert alignment is perpendicular to the alignment of embankment.; The investigation of factors affecting the earth pressures on cast-in-place box culverts suggested that the design pressures are not only dependent upon the height of the embankment only, but the relative stiffness of the surrounding materials is also important.
机译：通过现场仪器和数值分析，评估了影响深堤下埋入箱涵的土压力的因素。设计和建造了两种有仪器的现浇混凝土涵洞。施工结束后，在恒定路堤高度下观察到长期土压力。将观测到的土压力和通过数值分析预测的土压力与当前的AASHTO土压力建议以及在1970年代中期设计了失效的涵洞时有效的AASHTO设计压力进行了比较。现场测量表明，以前的AASHTO设计压力（1977年）大大低估了垂直和水平方向的土压力，而当前的AASHTO（1996年）提供了更合适的简化土压力。实测和预测的土压力都表明压实强度对土压力分布有重要影响，特别是作用在涵洞壁上的水平土压力。参数有限元研究表明，涵洞旁的砾石回填的刚度取决于压实程度，对土压力的大小和分布影响最大。一项额外的参数研究表明，涵洞下的土壤模量对水平土压力也有显着影响。还记录了由接近建筑结构的不同建筑设备引起的动态水平土压力。测量表明，响应最大瞬时载荷（约70 kPa）的结构中的动态应变很小，对涵洞的影响可忽略不计。发现在压实后测得的高残余压实土压力会随时间快速下降，在恒定的路堤高度下达到稳定值。对涵洞相对于路堤路线的方位的分析评估表明，当涵洞路线垂直于路堤路线时，作用在涵洞壁上的最大水平土压力会发生。对影响现浇箱涵土压力的因素的研究表明，设计压力不仅仅取决于路堤的高度，而且周围材料的相对刚度也很重要。

著录项

  • 作者

    Yang, Michael Zhiqiang.;

  • 作者单位

    The University of Tennessee.;

  • 授予单位 The University of Tennessee.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 272 p.
  • 总页数 272
  • 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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