中文摘要：

为研究纵横垂直交叉隧道的稳定性问题,采用现场监测的方法研究新旧隧道之间的沉降变形情况。通过现场监测,新建隧道的施工使既有隧道在交叉点区域产生了沉降,最大沉降量达6 mm。新建隧道内部的围岩、钢筋和混凝土也表现出了轻微的变形,应力变化主要集中在拱腰,变形主要集中在拱顶。隧道交叉区域的围岩条件、爆破施工方法、下穿小间距的施工方案是导致沉降变形的主要因素。通过对围岩的超前加固、支护结构的加强等措施可以有效地控制了隧道和围岩的变形沉降。

英文摘要：

In order to study on the stability problem of the intersection tunnel,this project adopts the experiment method to monitor the settlement deformation situation between the old and new tunnel. Through the field monitoring,the settlement is generated in the tunnel intersection by the new tunnel construction process,the maximum settlement amount is 6mm. In the new tunnel,the surrounding rock,steel and concrete also shows a slight deformation,stress changes are mainly concentrated in the arch,deformation mainly concentrated in the vault. Surrounding rock condition,blasting construction method,and the construction with small spacing under old the crossing tunnel in the crossing area are the main factors leading to the settlement. The construction of the tunnel crossing area should be combined with the surrounding rock and tunnel requirements,the reasonable construction scheme is chosen,the mutual influence between the old and new line construction and the occurrence of the accident disaster are avoided.