公路软土地基粉喷桩加固方案优化分析

Optimization Analysis of Soft Soil Foundation Reinforced by Powder Spray Pile

为合理确定软土地基粉喷桩复合地基加固方案,根据设计资料初步确定粉喷桩加固方案,采用有限元软件建立计算模型对粉喷桩复合地基变形影响因素进行分析。分析计算结果,得出随桩间距的增加路基沉降增加,随桩体弹性模量的增加路基沉降和水平位移不断下降,随垫层弹性模量的增加路基各指标变形下降。全面考虑确定粉喷桩桩间距合理取值范围为1.2~1.5 m,桩体和垫层弹性模量取值应在100 000 kPa左右。

To reasonably determine the reinforcement scheme for the soft soil foundation with the powder spray pile,by according to the design information to determine the primary reinforcement scheme,the calculation model was established by to analyze the influencing factors on the deformation of the powder spray pile composite foundation.The analysis result showed that with the increasing pile spacing,the subgrade settlement increased,with the increase of the elastic modulus of the pile body,the settlement and the horizontal displacement of the subgrade continuously decreased,and with the increase of the elastic modulus of the cushion,the deformation of each subgrade index decreased.With comprehensive consideration,the reasonable range of the value of the powder spray pile spacing was 1.2-1.5 m,and the value of the elastic modulus of the pile body and cushion should be about 100000 kPa.