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真空预压是一种加固软弱土地基的新技术。它是用真空泵将封闭在塑料薄膜以下的砂垫层内的水和空气吸出。首先在塑料薄膜以下形成真空,在塑料薄膜上、下压力差的作用下同时产生两种效应:
Vacuum preloading is a new technology to reinforce weak ground. It uses a vacuum pump to suck out the water and air trapped in the sand mat beneath the plastic film. First, a vacuum is formed below the plastic film, and two effects are simultaneously produced on the plastic film under the pressure difference: