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首页> 外文期刊>Geotechnical testing journal >Modeling Long-Term Deformations of Unbound Pavement Materials Using the Miniaturized Pressuremeter Creep Data
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Modeling Long-Term Deformations of Unbound Pavement Materials Using the Miniaturized Pressuremeter Creep Data

机译：使用微型压力计蠕变数据对未粘结的路面材料的长期变形进行建模

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This research was undertaken to study the predictive capability of the pressuremeter test for characterizing in situ creep behavior of unbound pavement layers. Although the creep potential of granular pavement materials is less pronounced than fine-grained soils, consideration of actual creep deformations in the pavement evaluation process will improve long-term pavement performance. In this investigation, the long-term deformations determined from laboratory one-dimensional creep tests were compared with those investigated by field pressuremeter tests. The pressuremeter test consisted of inflating a cylindrical probe incrementally up to a given stress level, and then maintaining the pressure constant for a 5-min single stage. During this stage, radial deformations of the soil cavity were recorded at each 30-s interval. The one-dimensional creep test was performed on remolded soil specimens through applying a constant stress level for 7 days. Comparison of creep parameters deduced from pressuremeter and creep tests data was based on the Singh-Mitchell creep model. The results showed that the average strain rates derived from in situ pressuremeter data are valid, and compare well with those predicted from the laboratory creep test. Thus, the pressuremeter device can be employed to assess field strain-time behavior of pavement systems in a fast and reliable approach.
机译：进行这项研究以研究压力计测试对未粘结路面的原位蠕变特性进行表征的预测能力。尽管粒状路面材料的蠕变潜力不如细粒土壤明显，但在路面评估过程中考虑实际的蠕变变形将改善长期路面性能。在这项研究中，将实验室一维蠕变试验确定的长期变形与现场压力计试验研究的变形进行了比较。压力计测试包括将圆柱形探针逐渐充气到给定的应力水平，然后将压力恒定保持5分钟。在此阶段，每隔30秒记录一次土壤腔的径向变形。通过施加恒定的应力水平7天，对重塑的土壤样品进行一维蠕变测试。从压力计和蠕变测试数据推导出的蠕变参数的比较基于Singh-Mitchell蠕变模型。结果表明，从现场压力计数据得出的平均应变率是有效的，并且与实验室蠕变试验预测的结果相比较。因此，压力计装置可用于以快速且可靠的方式评估路面系统的现场应变-时间行为。

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