一维向下渗流作用下双层地基有效应力性状研究

Study on Behavior of Effective Stress of Double-layered Ground under One-dim ensional Downward Seepage

研究了一维向下渗流作用下双层地基有效应力的计算问题 ,推导了有效应力的计算公式 ,讨论了有效应力性状 ,定义了渗流有效应力的概念。一维向下渗流作用使土层的有效应力增加 ,因此引起地基附加沉降。渗流作用下土层有效应力由两部分组成 :一部分是自重有效应力 ,其由重力引起的 ,体现了静水压力的影响 ;另一部分是渗透有效应力 ,其是由土层水头差产生的 。

A formula to calculate the effective stress is give n for the double\|layered ground under one\|dimensional downward seepage.Based o n the formula the behavior of effective stress is discussed and the concept for the effective stress of seepage is defined.The effective stress in soil layers i s increased with one\|dimensional downward seepage,which causes the additional s ettlement of ground.The effective stress is divided into two parts:the self\|wei ght effective stress and the effective stress of seepage.The former embodying th e effect of hydrostatical pressure is caused by the geostatic weight of the soil ,and the latter embodying the effect of super hydrostatical pressure is given ri se to by the seepage.