CFG桩复合地基试验研究

Experimental research on composite foundations with CFG piles

CFG桩复合地基广泛应用于土木工程各个领域,但就CFG桩复合地基的工作性态及桩-土共同作用机制尚不十分清楚,需要进一步研究。通过对CFG桩复合地基在川北某高层建筑中现场测试项目的资料分析,得出了CFG桩的桩-土应力分担的变化规律,对褥垫层上下的应力状态有了更为清晰的了解。测试荷载是实际的结构荷载,测试环境是实际的基础环境,测试结果更具实用性。测试结果显示,随着外加荷载的增加,桩-土应力比比例增加。当施工荷载为210 kPa时,桩-土应力比可达16。随着施工荷载的增加,桩体所分担的荷载增加较快,桩间土体分担荷载增加较慢。

Based on researching the load test of the cement flyash gravel（CFG） pile composite foundation, the bearing capacity and deformation characteristics of CFG piles are analyzed. And through the medium of the earth stress cells buried above the cushion and below the cushion, tested stress characteristic of CFG piles and the soil stress between piles are obtained. According to these measurements, the vertical stress of the CFG pile is about 16 times bigger than the earth stress between pile when the working load is 210 kPa. Along with the increment of working load, the sharing load of the pile increases fast, but the sharing load of the soil between piles increases slowly.