高路堤下涵洞垂直土压力研究

依托十漫高速公路高填方涵洞工程,结合现场测试结果,采用理论分析和数值模拟的方法研究了高填方涵洞垂直土压力分布特征和变化规律,并对顾安全垂直土压力理论计算公式进行了修正,得出与现场实测结果更为接近的高路堤下涵洞垂直土压力计算方法。研究结果表明:高填方涵洞涵顶存在垂直土压力集中现象,土压力集中系数随填土高度的增加逐渐增大,当路堤填土达到一定高度后逐渐趋于稳定并略有减小。

Vertical earth pressure on culverts under high embankments

Based on the project of the culverts under high embankments in the expressway from Shiyan to Manchuanguan,the distribution characteristics and variation laws of the vertical earth pressure on culverts are studied by theoretical anlysis,numerical simulation,as well as field tests.The formula for the vertical earth pressure proposed by GU An-quan is modified to get the values which are closer to those measured in the field tests.The results show that there is earth pressure concentration on the top of culverts under high embankments,and that the concentration coefficient increases with the height of the fill,but it approaches the limit value at a certain height of fill,then decreases slightly.