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高速公路粉喷桩复合地基的沉降预测不仅可以反映路基的沉降发展趋势,而且可以通过预测的沉降量来反映出路基的加固效果及稳定性,为后续工序的开展提供指导。以某高速公路粉喷桩复合地基预压期的监测结果为例,运用改进的灰色模型建立非等时距的GM(1,1)预测模型,并用后验差法对其预测精度进行检验。结果表明,改进的灰色模型的预测精度较高,能作为粉喷桩复合地基沉降预测的一种方法。
The settlement prediction of DJM composite foundation can not only reflect the tendency of subgrade settlement, but also can reflect the reinforcement effect and stability of roadbed through the predicted subsidence to provide guidance for the follow-up work. Taking the monitoring results of pre-compression period of DJM pile composite foundation as an example, the GM (1,1) forecasting model with non-isochronous distance was established by the improved gray model, and its prediction accuracy was tested by the posterior difference method. The results show that the improved gray model has higher prediction accuracy and can be used as a method of settlement prediction of DJM composite foundation.