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。
