膨胀土挡墙侧向膨胀压力研究

Lateral swelling pressure of expansive soil acting on retaining wall due to inundation

通过大型模型试验,研究了深层浸水条件下膨胀土挡墙侧向膨胀压力的变化规律。结果表明,随着浸水时间的增加,挡墙侧向膨胀压力逐渐增长到最大值,尔后,若挡墙为不能移动时,压力稳定在最大值附近,但若挡墙是可移动的,则压力逐渐减小至稳定值。挡墙可动与不能移动的最大侧向膨胀压力之比约为0.45,挡墙可动时的最大侧向膨胀压力与稳定侧向膨胀压力之比约为1.3～1.5。综合考虑了膨胀力与含水率、含水率变化与深度、膨胀率与上覆压力、膨胀力与膨胀率的关系,提出了侧向膨胀压力计算方法,分析了侧向膨胀压力的垂向分布模式和影响因素,计算结果与模型试验结果较吻合,此外,还推导了侧向膨胀压力的合力及其作用点位置。

A large scale model test was carried out to study the variation of lateral swelling pressure of expansive soil acting on retaining wall due to deep inundation.It is found that the pressure increases gradually following the increase of inundation duration and reaches a maximum.If the retaining wall is unmovable,the pressure acting on retaining wall maintains at this maximum value,but if the retaining wall is movable the pressure will increase at first and then decrease gradually afterward and reaches a stabl...