地下结构上水土压力的合算与分算既关系到基坑围护的设计，又关系到地下结构的抗拔桩设置。现场数据表明，砂性土采用水土压力分算是合理的，但黏性土采用水土压力合算是否合理一直是学术界与工程界争论的焦点问题。为解决争议，笔者提出了可以统一水土压力合算与分算的方法，作为一个逻辑上自洽的理论，实现了水土分算与合算之间的过渡，为水土合算提供了理论基础。回顾该理论的提出过程，对其合理性做了进一步说明，分析了该理论的学术价值和发展前景。

The separate and combined calculation of water-soil pressures on underground structures affects not only the design of supporting structures of excavations, but also the setting of uplift piles. Based on the field data, it has been proved to be reasonable to calculate the water-soil pressures by the separate calculation method for sandy soil. However, whether the combined calculations of the water-soil pressures is scientific or not for clay has been the focus dispute between geotechnical engineering and academic circles. In order to resolve this dispute, the author has proposed a calculation method to unify the separate and combined calculations of water-soil pressures. As a logically self-consistent theory, it carries out the transition between the two conventional calculation methods and provides a theoretical basis for the combined calculation method of water-soil pressures. This paper reviews the process of this theory initiation and further illustrates its rationality. Finally, it analyzed the value and development prospects of this theory.