高速铁路桥台桩基补强注浆工艺及效果分析

Reinforcement Grouting Technology and Effect Analysis for Pile Foundation of High Speed Railway Abutment

以一高速铁路桥台桩基补强工程为依托,结合现场实际情况,采用多次控制劈裂注浆工艺,建立了第1次常压注浆、第2次劈裂注浆、第3次复压注浆工法,分析了钻孔注浆期间周边地面沉降变形,探讨了多次控制劈裂注浆工艺对地面点竖向变形的影响。结合钻孔取芯得到的注浆体样本,研究多次控制劈裂注浆工艺的注浆效果。结果表明:注浆区域与未注浆区域有明显的分界面,注浆后土体的单轴抗压强度变化不大,且不同土性对注浆后土体单轴抗压强度影响较小,注浆补强效果显著。

Based on a high speed railway bridge abutment pile foundation reinforcement project,combined with theactual situation of the site,the first normal pressure grouting,the second split grouting and the third re-pressuregrouting were established by using multiple controlled split grouting technology.The settlement and deformation ofsurrounding ground during drilling and grouting were analyzed,and the influence of multiple controlled split groutingtechnology on vertical deformation of ground points was discussed.Combined with the grouting samples obtained fromcore drilling,the grouting effect of multiple controlled split grouting technology was studied.The results show that thereis an obvious interface between the grouting area and the non-grouting area.The uniaxial compressive strength of the soilafter grouting changes little,and different soil properties have little influence on the uniaxial compressive strength of thesoil after grouting,and the grouting reinforcement effect is significant.