填高对箱涵填土变形和土压力分布特性的影响分析

Analysis of influence of filling height on deformation and earth pressure distribution characteristics of box culvert filling

填土与箱涵之间受力机理复杂,应力集中现象经常在箱涵顶部位置出现。目前为止,箱涵土压力的计算理论还未能充分考虑涵顶上方土压力分布规律的影响,仅简单的定义为均布荷载,从而导致箱涵理论分析的结果与实际箱涵土压力分布和变形之间存在较大差异。利用Midas-GTS/NX有限元计算软件建立仿真分析模型,研究了不同填土高度对填土变形和箱涵土压力的影响,得到了不同填土高度下的土压力集中系数。

The force mechanism between the fill and box culvert is complex,thus stress concentration often occurs at the top of the box culvert.So far,the calculation theory of box culvert earth pressure has not considered the influence of the distribution law of earth pressure above the top of the culvert,so it is always simply defined as uniform load,which leads to a big different result between theoretical analysis and the actual distribution of siol pressure of box culvert.MIDAS-GTS/NX finite element software is used to establish the simulation analysis model.The influence of different filling height on the deformation and earth pressure of box culvert is studied,and the earth pressure concentration coefficient under different filling height is obtained.