混凝土芯砂石桩的沉桩挤土效应及超孔隙水压力变化

Soil squeezing effect of concrete-cored sand-gravel piles and excess pore water pressure dissipation

简单介绍了新型软基处理技术———混凝土芯砂石桩.从挤土桩沉桩过程产生的挤土效应出发,运用圆孔扩张理论和固结理论,分析了混凝土芯砂石桩的挤土性状.算例表明,成桩后的混凝土芯砂石桩,其挤土效应产生的超孔隙水压力的消散,远快于常用的水泥粉煤灰碎石桩(CFG桩).

Concrete-cored sand-gravel pile as a new technique for improvement of soft foundation is briefly introduced. Based on the squeezing effect in the process of pile sinking, the squeezing behaviour of concrete-cored sand-gravel piles is analyzed by applying cavity expansion theory and consolidation theory. Results of calculation show that dissipation of excess pore water pressure due to squeezing effect of concrete-cored sand-gravel piles is faster than that of the ordinary CFG piles.