A new prediction method of the pressure of early temporary support

Combined the boundary punition element (spring element) with the finite element and stress distribution around the periphery of a tunnel in the initial period of tunnel excavation are calculated.With boundary spring element,complicated boundary condition can be changed into another guestion added with a new element that is on the same position as original elements.It presents a new way for pressure prediction of early pressure of temporary support which is an important reference of support design in the initial period of tunnel excavation.