堆载预压法引起水平应力增长的分析

介绍了堆载预压法的作用机理,基于Rendulic的假定,推导获得了预压结束后土体水平应力的表达式,讨论了影响水平应力的因素,并对两种极端情况进行了分析。结果表明,水平应力增长最大处,既不是在土体顶部,也不是在土体的底部,而是在土体的中部某处;土体所受预压荷载较小,土体处于弹性变形范围时,土体的水平应力在预压前后几乎保持不变;水平应力的增量随回弹指数与压缩指数的比值的增大而减小。

Analysis on Horizontal Stress Increase by Preloading Method

The mechanism of the action of preloading method is introduced in this paper.Based on Rendulic assumption,the formula of soil horizontal stress after preloading is educed and the influencing factors of horizontal stress are discussed.Two extreme cases are then analyzed.The result shows that the maximum increase of horizontal stress is neither at the top nor at the bottom of soil mass,but in somewhere in the middle of soil mass.If preloading is smaller,horizontal stress remains almost unchanged before and after preloading when soil mass is within elastic strain range.Horizontal stress increases less if the ratio between resilience index and compression index increased.