高填方涵洞土压力变化规律与影响因素的数值模拟研究

通过模型试验和数值模拟计算研究了不同边界条件下的公路高填方涵洞土压力随填土高度变化的规律和拱效应特点,不同涵位、不同孔径和不同涵型的受力特点和影响高填方涵洞受力的因素,结果表明,当涵顶填土达到一定高度以后,高填方涵洞上方将产生拱效应,使涵顶土压力不随填土高度成线性变化,而成非线性规律变化,边界条件对高填方涵洞的受力有一定的影响,岸坡设涵和坡脚设涵可以减小涵洞的土压力.成果对高填方涵洞土压力计算和设计有重要理论参考价值.

Numerical simulation study on the law of earth pressures on the culvert beneath high embankment and the factors of effect on the earth pressures

The law of earth pressure on the culvert changing with the height of fills and the arch action are investigated by model test and numerical simulation. The results of model testing and numerical simulation indicate that as the fills on the culvert reach a higher of height the arch action will come and the earth pressures increase non-linearly with the height of fills, and in addition the earth pressures can be indirectly affected by the boundary condition of culvert sitting . It is also confirmed by mode test and numerical simulation that unstablity is an important characteristic of arch action on the culvert beneath the high embankment and results in the earth pressures non-linearly increasing.