某黄土深基坑周边既有桥基袖阀管注浆加固效果评价

Sleeve valve pipe grouting reinforcement evaluation of existing bridge foundation around a loess deep foundation

某城市立交濒临地铁深基坑周边,为了减少深基坑开挖带来的风险,选用了袖阀管注浆对立交桥进行了加固处理。通过桩体水平位移的变化与实测桥桩沉降对注浆效果进行评价。经分析,加固后桥桩旁的土层得到了挤密,桥桩上由于基坑开挖而产生的不平衡力得到减小,桥墩及周边地面沉降较小,注浆加固达到了预计的效果。

A city overpass near the subway deep foundation pit,in order to reduce the risk of deep foundation pit excavation,the sleeve valve grouting was selected to reinforce the bridge pile foundation. The grouting effects are evaluated by changes of pile lateral displacement and the field settlement data. After analysis,reinforced soil next to the bridge pile have been compacted,the unbalanced force generated by foundation excavation on pile reduces. The settlement of bridge piers and surrounding ground are relatively small. The grouting reinforcement achieves the estimated results.