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最近,在南非约翰内斯堡西面修筑有一条高速公路支线,其路基基础必须建在一片沼泽地中。采用的路基基础处理办法是,用翻斗车在沼泽地上铺一层碎岩石,然后进行强夯,这样就形成了一些短而租的碎石柱,其最大厚度达6米,一直下列了页岩和石英岩基岩上。通过强夯形成的一根根短而粗的碎石柱,改善了石柱周围软泥的固结特性,增加了强度。但改善程度也不尽相同。强夯大大地减少沼泽基础因路堤自重可能出现的固结沉降量,而碎石柱则显著地加强了整个路堤的稳定性。
Recently, an expressway extension was constructed west of Johannesburg, South Africa, and its foundations must be built on a swamp of land. The subgrade approach used was to lay a layer of crushed rock on a swamp with a dump truck and then rammed so that short, renting rubble columns were formed with a maximum thickness of 6 meters and the following shale And quartzite rock. A short and thick gravel column formed by dynamic compaction improves the consolidation properties of the slime around the stone columns and increases the strength. But the improvement is not the same. Dynamic compaction greatly reduces the amount of consolidation settlement that may occur on the marsh foundation due to the weight of the embankment, while the rubble column significantly enhances the stability of the entire embankment.