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为弥补公路路堤沉降预测中各现有模型存在的不足,并有效控制高路堤在建设期的稳定性,提出了基于等体积法的路堤侧向位移沉降模型,并推导出了计算公式。采用该公式对高速公路试验段长达1 a的沉降和侧向位移观测数据进行分析计算。结果表明,由侧向位移产生的沉降量约占总沉降量的20%;侧向位移产生的沉降也并非瞬时能完成,也能延续相当长的时间;瞬时固结过程中没有孔隙水的排出,但将路基土看成弹性体而认为其导致的变形是瞬时完成的看法是片面的。在沉降预测中,应充分考虑侧向位移产生的沉降对模型的影响;侧向位移沉降模型能更好地反映出高路堤沉降组成和实际情况,预测准确。
In order to make up for the shortcomings of existing models in highway embankment settlement prediction and effectively control the stability of high embankment in construction period, a lateral settlement model of embankment based on equal volume method was proposed and the calculation formula was deduced. This formula is used to analyze and calculate the observation data of settlement and lateral displacement up to 1 year in the test section of expressway. The results show that the settlement caused by the lateral displacement accounts for about 20% of the total settlement. The settlement caused by the lateral displacement is not instantaneous and can last for quite a long time. There is no discharge of pore water during the instantaneous consolidation However, considering subgrade soil as an elastic body and considering its deformation as an instantaneous completion is one-sided. In the settlement prediction, the influence of settlement due to lateral displacement on the model should be fully considered. The lateral displacement settlement model can better reflect the settlement composition and actual conditions of the high embankment and predict accurately.