粉喷和浆喷水泥桩加固软土地基的力学特性

以工程实例为依托,对粉、浆喷桩进行研究。研究表明:相同龄期的粉喷桩强度高于浆喷桩;两种桩桩体上部桩身强度具有明显的随深度增加而减小的规律;单桩静载达到极限荷载时,桩体发生刺入破坏的可能性较大;桩身破坏时的变形特性、裂纹分布随桩强度的不同而不同;在提高软土地基承载能力方面,粉喷桩要略优于浆喷桩。

Mechanical Characteristics of Soft Soil Foundation Reinforced with Powder-jetting and Grout-jetting Cement Piles

Based on construction projects, the powder-jetting and grout-jetting cement piles are studied. The results indicate that： the powder-jetting pile has higher strength than the grout-jetting one under the same period; both piles follow a rule that upper strength decreases while going deeper; it＇s quite possible that penetration de- struction happens to the piles once the static load of single-pile reaches the limit; the deformation characteristics and distribution of cracks vary with the strength of piles; in terms of improvement of bearing capacity of soft soil foundation, powder-jetting pile is better than grout-jetting pile,