浅埋偏压连拱隧道的施工方案选择

中龙隧道位于江西省泰和县中龙乡,是泉州至南宁国家高速公路江西石城至吉安段C4标的一座地形地质较为复杂的连拱隧道。隧道在出洞口段,右侧近100米长度存在较大偏压,其中约40米埋深较浅,隧道出露冒顶,洞口段围岩级别较差,多为比较破碎的碎石土或强风化岩石,围岩自稳能力差,给设计和施工带来了一定的难度。本文结合工程实例,对隧道结构的薄弱部分加强和优化设计,对隧道施工提出合理的方案。

Construction Scheme Selection of Shallow Buried Bias Voltage Multiple-arch Tunnel

Zhonglong tunnel is located in Zhonglong Town,Taihe County,Jiangxi Province,is a multiple-arch tunnel that from Quanzhou to Nanning national highway that from Jiangxi Shicheng to Ji＇an section C4,where topography and geology is more complex.The tunnel is in the entrance section,in the right side near 100 meters,here is a big bias,about 40 meters is shallow buried,the tunnel exposed roof caving,the rock-level of the entrance section is poorer,mostly are breakage gravel soils or strongly weathered rock,so the stability of surrounding rock is poor,which bring a certain degree of difficulty to the design and construction.This paper,combined with engineering example,strengthens and optimizes the design of the weak part of the tunnel structure proposes reasonable scheme of tunnel construction.