From analyzing the change of effective stress in the process of one-direction to two-direction load, it is founded that the evanescing process of pore water pressure proposed in the paper shows a better agreement to fact. 从对单向荷载作用时地基的有效应力变化过程分析入手,引伸到对双向荷载作用时地基的有效应力变化过程分析,提出与实际情况更为符合的孔隙水压力消散过程。