南京塑料研制厂研究的 SPB—1型塑料排水板(见图1),由塑料芯板和外包的滤水薄膜套组成,在芯板和滤套之间形成纵向排水通路。当塑料排水板被插入土中,在土面上加载预压,或用真空预压时,土体内的自由水在超静孔隙水压力作用下,透过滤膜套渗入芯板的沟槽,再沿沟槽排至地表 The SPB-1 plastic drainage board (see Figure 1) studied by the Nanjing Plastics Development Plant consists of a plastic core and an outer water filter cover, forming a vertical drainage path between the core and the filter cover. When the plastic drainage board is inserted into the soil and the preloading is applied to the soil surface or vacuum preloading is performed, the free water in the soil penetrates into the groove of the core plate under the action of the excess pore water pressure, and then penetrates into the groove of the core plate. Run along the trench to the surface