ABSTRACT

Problems of large settlements and uneven settlements on the road always happen during service stage. Reinforced embankments can reduce these problems. But currently the study on the mechanical properties of reinforced embankments during service stage are so few, and lack of measured data. This study uses numerical simulation and on-site measured data analysis to set up a geogrid creep damage model and traffic load model. Based on the analysis of the mechanical properties of reinforced embankment under the conditions of new test section and widening test section, the influence laws of traffic load amplitude, frequency and driving interval on reinforced embankment are obtained. When the traffic load amplitude is 2q₀, there is little difference in settlement between the two test sections, but the settlement ratio gets the maximum value of 0.028 mm/d when the amplitude is 2q₀. When the traffic load frequency increases from 1 Hz to 4 Hz, the embankment settlement is in the sudden settlement stage, and the settlement is almost stable after 4 Hz. When the driving interval is greater than 4 s, the rebound value and rebound time are almost stable.

摘要

道路上沉降大、沉降不均匀的问题在服务阶段时有发生。加固路堤可以减少这些问题。但目前对加筋路堤服役期力学性能的研究较少，缺乏实测数据。本研究采用数值模拟和现场实测数据分析，建立土工格栅蠕变损伤模型和交通荷载模型。通过对新建试验段和加宽试验段条件下加筋路堤的力学性能分析，得出交通荷载幅值、频率和行车间隔对加筋路基的影响规律。当流量负载幅度为 2 q ₀，两个试验断面的沉降差异不大，但在振幅为2 q ₀时沉降比达到最大值 0.028 mm/d 。当交通负荷频率从 1 Hz 增加到 4 Hz 时，路堤沉降处于突发沉降阶段，4 Hz 后沉降基本稳定。当行驶间隔大于 4 s 时，回弹值和回弹时间基本稳定。