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我国的沿海和内陆广泛分布着海相、湖相以及河相沉积的软弱黏性土层,这种土的含水量大、强度低、透水性差。由于它的压缩性高透水性差,在建筑荷载作用下会产生相当大的沉降差,并且持续时间长,会引起建筑物的裂缝,影响其正常使用。本文探讨了用于加固软土地基的真空预压法的影响因素,以及与堆载预压的区别,利用基于三维有限差分法的FLAC3D软件对真空预压法进行了数值模拟,对预压过程和结果进行了分析。
China’s coastal and inland areas are widely distributed with weak clayey soils of marine facies, lacustrine facies, and river facies. This soil has large water content, low strength, and poor permeability. Because of its high compressibility and poor water permeability, under construction load, it will produce a considerable difference in settlement, and long duration, will cause cracks in buildings, affecting their normal use. This paper discusses the influencing factors of the vacuum preloading method used to reinforce the soft soil foundation, and the difference from the surcharge preloading. The vacuum preloading method is numerically simulated using the FLAC3D software based on the three-dimensional finite difference method, and the preloading process is performed. And the results were analyzed.