考虑外部接触面摩擦的堆叠土工管袋的力学分析

Mechanical analysis of stacked geosynthetic tubes with external frictional interface

针对刚性水平地基上3个对称堆叠的充水、充泥或充浆管袋,分别在两底袋接触和分离这2种堆放方式下,考虑管袋与管袋、管袋与地基之间接触面的摩擦作用,推求管袋拉力、摩擦力和几何形状的解析解答,分析充填压力和底袋的堆放距离对管袋受力的影响,并探讨管袋堆叠的稳定性问题。研究结果表明:底袋的堆放距离固定时,存在临界充填压力,使得管袋与管袋、地基之间动用的摩擦力较小;管袋的充填压力固定时,底袋的堆放存在临界距离,使得管袋的拉力和摩擦力均达到最小值,对应于最稳定的堆叠结构。

Three symmetrically stacked tubes, placed on a rigid horizontal foundation and filled with either water or slurry, were analyzed. Two stacked forms, with two underlying tubes in mutual contact and in isolation, were considered. The frictions at the tube-tube and the tube-foundation interfaces were also considered. Analytical solutions were derived for the tension, friction and shape of tubes. Investigations were carried out on the mechanical responses of tubes to the internal filling pressure and the stacked distance between two underlying tubes. Moreover, the stability of stacked tubes was addressed. The results show that for a specified stacked distance, there is a critical internal filling pressure for achieving lower frictions at the tube-tube and the tube-foundation interfaces. Under a specified internal filling pressure, there is a critical stacked distance for achieving the minimum tensions and frictions, which corresponds to the most stable stacked structure.