粉喷桩桩间土强度提高的试验研究

Experimental Study on Increasing the Strength of the Soil Around DJM Piles

根据《建筑地基处理技术规范》,粉喷桩复合地基桩间土的承载力特征值可取天然地基的承载力特征值。实践证明,对常规的粉喷桩施工工艺加以改进,其桩间土强度与天然地基相比有明显提高,且时效性增长。因此,采用处理后的桩间土强度指标进行粉喷桩复合地基承载力的计算是可行的。

According to Technical Code for Ground Treatment of Buildings, for composite foundation with dry jet mixing （DJM） piles, the characteristic value of bearing capacity of soil around piles are the same with that of the natural foundation. It is proven that the strength of the soil around DJM piles increases considerably and lasts longer when the improved construction process is applied. Therefore, it is feasible to take the strength of the soil around DJM piles after treatment in calculating the bearing capacity of DJM pile composite foundation.