边坡下涵洞顶部垂直土压力三维数值计算

Three-dimensional Numerical Calculation of Vertical Earth Pressure on Culvert under Slope

针对边坡下涵洞顶垂直土压力计算理论尚无系统研究的现状,为得到边坡下涵洞顶垂直土压力的变化规律,采用三维数值模拟计算方法,较为系统地研究了边坡下涵洞顶垂直土压力,以明确坡率、坡高、填土高度对洞顶土体垂直土压力的影响。结果表明,土压力系数均大于1,应力集中现象明显;土压力系数随填土高度的增加呈先增后减的趋势;随着坡高的增加,土压力系数呈非线性增大趋势,但在填土高度大于一定值后土压力系数趋于稳定;在一定填土高度范围内,坡率越大土压力系数越大,超过这个范围土压力系数差异很小。

At present, the computation theory of vertical earth pressure on culvert has not been systematically researched about the slope. In order to get change rule of vertical earth pressure on culvert under slope, three-dimensional numerical simulation is used to systematically research vertical earth pressure of culvert under slope. And then it acquires the influence of slope ratio, height of slope, height of filling on vertical earth pressure of culvert. The results show that coefficient of earth pressure is greater than 1 ; the stress concentration phenomenon is obvious; with the increase of filling height, the coefficient of earth pressure appears a trend of decrease after the first increase; with the increase of the height of slope, the coefficient of earth pressure appears nonlinear upward trend; however, when filling height is greater than a certain value, the coefficient of earth pressure tends to be stable; when filling height is less than this value, the coefficient of earth pressure is also increasing; within a certain range of filling height, the greater of slope ratio, the greater the coefficient of earth pressure is; the difference of coefficient of earth pressure is very small out of the range.