高速铁路路基下长短桩复合地基桩间土强度及地基承载力分析

Analysis of strength of soil masses among long-short piles composite foundation and bearing capacity of foundation under high speed railway subgrade

将高速铁路地基处理中的水泥土挤密桩和CFG桩对地基土的加强作用看作是一种加筋作用,通过各自的应力莫尔圆,得到了水泥土挤密桩和CFG桩共同作用下桩间土的强度表达式。两个地基处理工程实例的桩间土物理力学指标变化情况表明,两类桩对地基土都有加筋作用;工程实例天然地基及复合地基载荷板试验结果也表明,长、短桩对地基承载增大均有贡献,并分析了长、短桩处理后地基土的强度及承载力特性。

In high speed railway foundation treatment, the authors regard the effect of cement soil compaction pile and CFG pile to soils as one kind of reinforced effect, through stress Mohr circles of soil mass reinforced by cement soil compaction pile and CFG pile, obtained the formula of strength of soil mass among these piles. Through the change of physical and mechanical index of soil mass among piles, proved that the two kind of piles can reinforced the soil mass. And then detailed analyzed the load plate test on natural foundation and long-short composite foundation, as well as the contribution of the two kind of piles to bearing capacity of foundation, so that readers can clearly understand the strength characteristics of soil and the bearing capacity of composite foun-dation.