【摘要】 随着我国地铁建设的迅猛发展,地铁运营荷载造成软土地基的长期沉降问题引起了足够的重视。针对监测和观测时间的非等时性,文中采用牛顿二次插值多项式插值的方法建立了非等时距灰色理论模型GM(1,1)和GM(2,1),对上海地铁四号线一区段的沉降进行预测,并与实际监测沉降量进行了比较,结果表明,GM(2,1)较GM(1,1)有更高的精度。通过监测数据分析,发现其沉降速率上半年明显小于下半年,并给出了较为合理的解释。更多还原

【Abstract】 With the rapid development of metro construction in China,long-term settlement of soft soil subgrade caused by metro operating load has attracted more and more attention.For unequal time interval of monitoring and observation,this paper establishes gray theory model GM(1,1) and GM(2,1) with unequal time interval using Newton quadratic interpolation polynomial to carry out prediction on settlement of the first section of No.4 Line of Shanghai Metro and compare it with practical monitoring settlement.It is shown that GM(2,1) has higher precision to GM(1,1).Through monitoring data analysis,it is found that settlement rate in the first half year is significantly less than that in the second half year.This paper gives reasonable explanation for this.更多还原