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对上覆硬壳层软土夹层路基稳定性缺乏判定标准的问题,提出了填筑期与非填筑期分阶段研究模式.在填筑期内,通过监测数据与关键指标的比对,初步判断监控断面的稳定性状态;综合危险滑动圆弧的理论分析,以及塑性区开展和孔压消散的数值模拟结果,对监控断面的稳定性状态进行二次判断,改进规范法存在的不足,并制定出动态监控标准.在非填筑期内,借助构建的灰色预测模型获取最终沉降量,并以软弱下卧层压缩量与最终沉降量的比值作为评价因子,评判路基稳定性在非填筑期内的发展趋势.研究成果具有一定的理论指导意义和工程实用价值,可应用于高速公路路基的施工和监督环节.
For the problem of lack of judgment criteria for stability of embankment overlying soft crust with overburden, this paper puts forward a phased study mode of filling and non-filling periods. During the filling period, through the comparison of monitoring data with key indicators, Judging the stability status of the monitoring section; Based on the theoretical analysis of the dangerous sliding arc and the numerical simulation results of the plastic zone development and dissipation of pore pressure, the stability state of the monitoring section is secondarily judged to improve the deficiencies of the normalized method The dynamic monitoring standard was established.Finally, the final settlement was obtained by means of the constructed gray prediction model during the non-filling period, and the ratio of the amount of weak subsoil compression and the final settlement was taken as the evaluation factor to evaluate the stability of subgrade in non-filling The development trend during the period.The research results have certain theoretical significance and engineering practical value, which can be applied to the construction and supervision of expressway subgrade.