中文摘要：

依托连霍高速洛三段改扩建工程通过郑西高铁阌乡隧道上方这一工程案例,针对梁板式防护方案,在考虑围岩和衬砌劣化的基础上,采用强度折减法对高速公路改扩建工程中的最大挖方和超载运营两个状态的安全性分别进行了研究。结果表明隧道上方大体量挖方为控制性环节,梁板式防护方案能够保证阌乡隧道和改扩建工程的安全,所得结论为该近接工程的顺利施工提供了依据。在衬砌质量检测和无线监控手段的辅助下,顺利完成改扩建工程,证明了该研究成果的可靠性,可为类似近接工程的设计与施工提供技术参考。

英文摘要：

Relying on the expanding project of Lianhuo expressway Luosan segment crossing over the Wenxiang tunnel and utilizing the beam-slab protection scheme,the strength reduction method considering the reduction of both rock and liner was utilized to analyze the safety of maximum excavation and overload operation. The results showed that the maximum excavation was the most dangerous state and this scheme could guarantee the safety of both projects. This conclusion was dependable for constructing this adjacent project. With the help of quality testing for liner and the wireless monitoring method,this project was successfully constructed,which proved the result＇ s reliability and could also provide technical reference for tunnel design and construction of similar adjacent projects.