山区高速公路高填方盖板涵填筑期土压力变化规律研究

以包茂高速公路工程为依托,通过现场测试高填方路基下涵洞外界面受力,研究了涵洞受力规律和内在机制。结果表明:涵顶土压力随填土高度增大非线性增加,其中侧墙顶土压力大于填土自重且其增长率随填土增加逐渐减小,涵顶中心土压力在填土达到一定高度后大于填土自重,且其增长率保持稳定;填土完成后,两侧墙顶土压力约为填土自重的2.1~3.0倍,涵顶中部土压力约为填土自重的1.4~1.8倍;侧墙土压力小于静止土压力,实测水平土压力与静止土压力的比值为0.03~0.61;涵洞基底土压力呈不均匀分布,实测基底土压力与涵顶土压力平均

Research on the Change Law of Soil Pressure in the Filling Process of Highfill Slab Culverts of Expressway in Mountain Areas

Based on the Baotou-Maoming Expressway engineering,through field test of external stress imposed on culverts under highfill subgrade, the stress law and internal mechanism of culverts were studied. The results showed that the soil pressure on the top of culverts increased nonlinearly with the height of fill. Wherein, the soil pressure on the top of side wall was larger than the dead load of fill and the increasing rate was reduced gradually with the increase of fill. The soil pressure in the middle top of culvert would be with stable increasing rate after the fill reached a certain height and exceeded the dead load of fill. After filling, the soil pressure on the top of two side walls was about 2.1~3.0 times as much as the dead load of fill. The soil pressure in the middle top of culvert was about 1.4~1.8 times as much as the dead load of fill. The soil pressure of side wall was smaller than that of static soil. The ratio between measured horizontal soil pressure and static soil pressure was 0.03~0.61. The soil pressure at the bottom of culvert was unevenly distributed. The ratio between measured soil pressure at the bottom and the sum of average soil pressure on the top of culvert and dead load of culvert was 0.24~1.58.