在设计干船坞坞口时,由于坞门、排灌设施等工艺上的要求以及对结构受力性能方面的考虑,往往把坞口底板纵断面设计成变断面的型式(图一).作用在坞口上的外力,是来自许多方面的,而且是不均匀的,如在其四个侧面上均有土压力和水压力,坞口底板的前部有坞门重和水重,后部有船舶荷载等.通常坞口结构在长、宽、高三个方向上的尺寸也较接近,因此它是一个典型的搁置在半无限体地基上的空间结构. In the design of dry dock dock, due to dock doors, irrigation and drainage facilities and other process requirements and the performance of the mechanical properties of the consideration, the dock floor longitudinal section is often designed as a variable cross-section type (Figure 1) The external forces on the mouth come from many aspects and are uneven, such as earth pressure and water pressure on the four sides, the weight of the dock door at the front of the dock floor and the weight of the water at the rear of the dock floor, Etc. Generally, the size of the dock structure in the three directions of length, width and height is also close, so it is a typical space structure resting on the semi-infinite foundation.