CFS桩处理软弱地基的试验研究

介绍了一种新兴的地基处理技术--水泥粉煤灰钢渣桩（CFS）。采用现场大面积堆放钢坯的方式，模拟研究了CFS桩复合地基工作期间的承载特性，得出了堆载条件下基底的最终沉降量、桩间土体深层水平位移及竖向附加应力分布、临近的人工挖孔桩水平位移及其桩体前（后）附加应力变化等规律，探讨了堆载作用下CFS桩复合地基-临近桩体的共同作用机理。此外，研究了CFS桩施工所引起的环境效应，得出了CFS桩成桩过程中地基土侧向附加应力在水平、垂直方向上的变化规律及A，B试验区受桩体施工影响的地面隆起量。

Experimental study on improving soft foundation with CFS pile

A new ground improvement technology, cement fly-ash steel-slag pile, is presented. By piling up steel blanks to simulate the bearing properties of CFS pile composite foundation during service, some bearing characteristics including the settlement of foundation base, the deep horizontal displacement and the distribution of vertical additional stress of composite foundation, the horizontal displacement and the variable rhythm of lateral additional stress of adjacent excavated hole pile etc., are studied. The interaction mechanism of CFS pile composite foundation-adjacent excavated hole pile during superficial surcharge is also discussed. In addition, the environmental effect due to the construction of CFS pile is studied; the variable rhythm of lateral additional stress of foundation with distance and depth and the land upheaval value in A and B region are obtained.