连拱隧道围岩压力及中隔墙压应力的计算是隧道设计和施工过程中一个必不可少的环节。本文采用以地球物理学的基本理论为指导,根据地球重力场的特点导出的隧道围岩环向应力的计算表达式,将隧道模型简化为拱进行计算,并通过工程实例——国家重点干线杭州至兰州高速公路重庆市境内的云阳至万州段川主庙隧道的量测结果对计算进行验证,计算结果与实测结果比较吻合。 The calculation of the surrounding rock pressure and the compressive stress in the mid-arch tunnel is an indispensable part in the design and construction of the tunnel. In this paper, the basic theory of geophysics as a guide, according to the characteristics of the Earth’s gravity field derived from the tunnel surrounding rock circumferential stress calculation expression, the tunnel model is simplified to calculate the arch, and through examples of projects - the national key trunk Hangzhou To Lanzhou Expressway in Chongqing City, Yunyang Wanzhou section of the tunnel to test the results of the verification of the calculation, the calculation results and the measured results are in good agreement.