基于有限元的软土路基沉降影响因素分析

Analysis of Factors Influencing Soft Soil Foundation Settlement Based on Finite Element

为研究不同因素对软土路基沉降的影响,运用有限元软件建立软土路基截面数值模型,模拟分析了软土路基填方高度、填筑速率、排水桩间距及真空压力对路基竖向沉降的影响。结果表明:①随着填方高度的增大,路基沉降不断增大,实际工程中填方高度不宜过大;②随着填筑速率的增大,软土路基沉降不断增加,填筑速率为0.5 m/7d最为理想;③路基的沉降时间随着排水桩间距的增加而逐渐增大,间距为1 m时路基沉降最快达到稳定状态;④随着真空压力的增大,软土路基沉降逐渐增大,真空压力选取80 kPa路基最为稳定。

In order to study the effects of different factors on settlement of soft soil subgrade,a cross-section of soft soil subgrade was modeled numerically with finite element software to simulate and analyze how the fill height,the filling rate,the drainage pile spacing and the vacuum pressure influence the vertical settlement of the subgrade.The results show that,①as the fill height increases,the settlement keeps increasing,thus the fill height should not be too large in actual engineering;②as the filling rate increases,the settlement increases continuously and is most ideal at the rate of 0.5 m/7 d;③the settlement time of subgrade increases gradually with the increasing drainage pile spacing and reaches the stable state most rapidly when the spacing is 1 m;④as the vacuum pressure increases,the soft soil subgrade settles increasingly and will be most stable when the vacuum pressure is selected as 80 kPa.