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文中报道的现场数据资料描述了一座加筋土结构中土工格栅加筋的荷载—应变—时间关系。这些资料的观测时间在5年以上,它揭示了在近似恒定荷载作用下加筋中的连续应变问题。聚合材料由荷载所引起的结果是发生蠕变。现场观测数据与室内等时荷载—应变曲线的比较说明,这些曲线能够很好地描述现场观测的蠕应变大小。室内等时荷载—应变曲线是在与回填土年平均温度类似的室温下由快速加荷蠕变试验确定的。对荷载—应变—时间特性数据实质的评价是以设计中使用的由快速加荷蠕变试验和大宽度条带试验求取的抗拉强度为基础的。在聚合枷筋土结构设计中,有必要弄明白并加以强调安全抗拉强度和容许抗拉强度间的差异。
The field data reported in the paper describe the load-strain-time relationship of geogrid reinforcement in a reinforced earth structure. The observation time of these data is more than 5 years. It reveals the problem of continuous strain in the reinforcement under the action of an approximately constant load. The result of the load caused by the polymeric material is creep. The comparison of on-site observation data with indoor isochronous load-strain curves shows that these curves can describe the observed creep strain in situ. The indoor isochronous load-strain curve is determined by a fast-load creep test at room temperature similar to the annual mean temperature of the backfill soil. The substantial evaluation of the load-strain-time characteristic data is based on the tensile strength determined by the rapid-load creep test and the large-width strip test used in the design. In the design of polymer reinforced concrete structures, it is necessary to understand and emphasize the difference between the safety tensile strength and the allowable tensile strength.