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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。
In view of the fact that there is no systematic study on the calculation theory of vertical earth pressure at the culvert beneath a slope, in order to obtain the variation law of the vertical earth pressure at the culvert under a slope, a three-dimensional numerical simulation method is adopted to systematically study the vertical Earth pressure to clarify the effect of slope rate, slope height and fill height on the vertical earth pressure on the top soil. The results show that the earth pressure coefficient is greater than 1 and the stress concentration is obvious. The earth pressure coefficient firstly increases and then decreases with the increase of earth filling height. With the increase of slope height, the earth pressure coefficient increases nonlinearly, The soil pressure coefficient tends to be stable after the fill height is greater than a certain value. Within a certain filling height range, the greater the slope rate, the greater the earth pressure coefficient, and the difference of soil pressure coefficient beyond this range is small.