An analytical solution for displacement and stress caused by shallow buried tunnel excavation under existing highway foundation

Excavation under existing highway foundation will cause ground displacement and ground settlement. In order to control the ground settlement during excavating, it is important to solve out the ground displacement and stress quickly and accurately for design and construction. Based on image method and injected with equivalent layer method, the analytical solution of ground displacement and stress caused by shallow buried circular tunnel excavation under existing highway foundation is deduced. The result indicates that the ground displacement and stress law gained through this new solution can reflect the special transfer effect of settlement and stress via the upper harder highway foundation. The displacement and stress at any position in the highway foundation and the substratum and ground settlement can be gained through this solution, so as to provide a new analytical method for the calculation of ground displacement and ground settlement caused by circular tunnel excavation in double-layer ground material.