浅析南京地铁盾构进出洞区土体的加固技术

Analysis the in and out of the Hole Region’s Soil Reinforcement Technology of the Nanjing Subway Shield

摘要: 本文详细阐述了盾构法隧道在进出洞区土体加固的各种技术，介绍了南京地铁盾构进出洞区土体加固的常用技术，并对他们从多个角度进行了对比分析，对加固技术的选择提供一定的参考依据；结合前人的研究成果，对进出洞区的纵向和横向加固范围进行了归纳总结；最后介绍了南京某一盾构区间运用素钻孔灌注桩加双管旋喷桩和降水技术来进行土体加固的工程实例，论证了该加固技术的可行性，确保了盾构的成功始发和到达，对今后的类似工程具有一定的指导意义。

Abstract: This paper describes the shield tunnel’s in and out of the hole region’s soil reinforcement technologies, and introduces a common technique for soil reinforcement of Nanjing subway shield’s in and out of the hole region, and gives them a comparative analysis from multiple perspectives. To provide a reference basis for selection of reinforcement technology, by combining with the results of previous studies, it summarizes the in and out of the hole area’s longitudinal and transverse reinforcement range. Finally, it introduces a soil reinforcement project example of a Nanjing shield zone which used the bored pile, double-barreled churning pile and lowering technologies, and demonstrates the feasibility of this reinforcement technology which ensures the success of originating and reach of the shield. This study will have a certain guiding significance of the similar projects in the future.