粉喷桩复合地基处治高速公路软土路基影响因素分析  

Analysis on Influencing Factors of Treating Soft Soil Subgrade of Expressway on Composite Foundation of Powder Injection Pile

作　　者：陈钢 CHEN Gang(Hunan International Communications Economic Engineering Cooperation Co.,Ltd.,Changsha 410000,China)

机构地区：[1]湖南交通国际经济工程合作有限公司

出　　处：《北方交通》2019年第10期59-62,共4页Northern Communications

摘　　要：以某高速公路匝道软基工程为研究背景,运用PLAXIS有限元软件建立粉喷桩复合地基,针对不同桩长、桩径、桩间距、垫层厚度,对粉喷桩复合地基的沉降及水平位移进行数值模拟分析,得出以下结论:粉喷桩复合地基存在临界桩长,适宜的桩长才能有效控制复合地基沉降及水平位移;随着粉喷桩桩径的增大,复合地基沉降和水平位移均逐渐减小,但桩径过大对复合地基沉降及水平位移控制效果不明显;随着粉喷桩桩间距或垫层厚度的增大,复合地基的沉降量变化均不明显,粉喷桩桩间距过小或垫层厚度过大均不能有效控制粉喷桩复合地基沉降和水平位移,且导致施工难度及工程造价增大。Based on the soft foundation project of expressway ramp,the composite foundation of powder jet pile is established by PLAXIS finite element software,and the settlement and horizontal displacement of powder jet pile composite foundation are simulated and analyzed under the conditions of different pile length,pile diameter,pile spacing and cushion thickness.the following conclusions are drawn:there is critical pile length in powder jet pile composite foundation,and the suitable pile length can effectively control the settlement and horizontal displacement of composite foundation;with the increase of pile diameter,the settlement and horizontal displacement of composite foundation decrease gradually,but the effect of too large pile diameter on the settlement and horizontal displacement of composite foundation is not obvious;with the increase of powder jet grouting pile,the settlement and horizontal displacement of composite foundation are not obviously controlled.With the increase of pile spacing or cushion thickness,the settlement of composite foundation does not change obviously.Too small pile spacing or too large cushion thickness can not effectively control the settlement and horizontal displacement of powder jet pile composite foundation,and will lead to the difficulty of construction and the increase of engineering cost.

关 键 词：高速公路 软土路基 粉喷桩复合地基 沉降 

分 类 号：TU471.8[建筑科学—结构工程]