填土高度【height of fill】为保证路基稳定，根据土质、气候和水文地质条件所规定的路肩边缘至原地面的高度。
填土高度较大时不同理论和方法的计算结果相差更大。
The calculated results from different theory and method are greater when the backfill is higher.
同时确定了该路段的临界填土高度并且预测沉降总趋势。
The critical fill height is determined and the tendency of settlement is predicted.
涵洞侧向土压力的大小、分布及其随填土高度的变化规律；
Magnitude and distribution of vertical earth pressure on the top of culverts and their changes with soil-filled height;
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