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涵洞变形对涵顶土压力具有重要影响。利用有限元模拟计算,就涵洞变形对涵顶土压力的影响进行研究。分析表明,刚性圆涵的等沉面高度比随填土高度的增大逐渐减小,并趋于常数2.5,管土相对刚度减小,等沉面高度比减小1%~20%;对于各种管土相对刚度的圆涵,距涵洞竖轴0.65倍半径的洞壁点,其垂直土压力等于涵顶的土柱压力,该点是内、外土柱的分界点,又是涵顶土压力分布曲线的拐点;涵顶土压力系数随管土相对刚度的减小而减小,0.28为管土相对刚度系数的中性值,其对应的土压力系数近似为1.0.
Culvert deformation has an important impact on culvert pressure. Using finite element simulation calculation, the influence of culvert deformation on culvert pressure is studied. The analysis shows that the ratio of equal sinking height of rigid round culvert decreases with the increase of filling height and tends to a constant of 2.5, and the relative stiffness of the soil decreases with the decrease of the height ratio of the sinking surface by 1% ~ 20% The round culvert with relative rigidities of pipe and soil, the hole wall with 0.65 times radius from the vertical axis of the culvert, the vertical earth pressure is equal to the earth pressure of the culvert, which is the demarcation point of the soil column and the culvert Soil pressure distribution curve inflection point; culvert pressure coefficient decreases with the decrease of relative stiffness of soil pipe; 0.28 is the neutral value of relative stiffness coefficient of pipe soil, and its corresponding earth pressure coefficient is approximately 1.0.